Stuck fan relay. It will cause your AC’s components not to turn off.
Stuck fan relay Relay reliability: Opt for relays from reputable sources like auto recycling yards to make sure you’re getting reliable alternatives for your Oct 23, 2024 · 2. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Jun 2, 2012 · I think my blower motor fan relay is stuck in the on position. I heard it could maybe be a stuck relay. Diagnosing involves testing the relay with a multimeter. One possibility is a stuck fan relay, but replacement & testing show the relay/time delay board are fine. Burnt smell: Sticking often Jan 4, 2016 · The power for all the relay coils go though the Ignition Relay. Are you probably concerned that why does my radiator fan stay on when my car is off? There are many things that can happen to your car from a bad fan switch to stuck fan relay or faulty fan clutch. Put the fuse back in then use a screwdriver handle to knock on any and all relays. Symptoms Of A Stuck AC Relay Switch. . So, I pulled it as a means (my logic) if de-energizing the relay. " when fan is in 1st speed relay RL1 is active " Feb 5, 2009 · The problem could be a stuck fan relay or a crossed wire between 24v and fan wire. Damaged or loose connections can disrupt the communication, leading to the fan running indefinitely. It works OK in heat (I think). There are a lot of reasons that can cause the relay to stick. In the new module the fan relay was working but the other relay wasn’t, after a couple of tries it started working but shortly after it was stuck in the closed position Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Sep 4, 2023 · Bad Fan Relay. com . 2017 Ford Escape cooling fan relay stuck. Jun 12, 2022 · The fan is controlled by a solid state PWM relay. A stuck relay on an AC unit will make your AC unturnable. Fan still running even though car is cool and air temps cold. Jun 15, 2019 · R03 causes relay RL4 to close and the motor runs at HIGH speed. I'm fine with the fan running continuously but am concerned about safety issues. Check to see if the relay is being commanded on, i. You happen to possess a 2014 Chevy Silverado and observe that the radiator fan persists in running. The basic function of a relay is to open up different electric circuits so that all the components can work properly. In the other condition, your AC can’t be turned on when the relay is stuck. There were 3 other relays in there also, with the same number (wipers, Ect). If you notice that your engine is running at higher temperatures than normal Dec 25, 2024 · How to Identify Relay Sticking Problems Spotting relay sticking early can save you from bigger headaches. the relay is around $45. When it becomes stuck, the AC unit is unable to receive the required electrical supply, thus hindering the cooling process. This is a fairly common issue, especially in older vehicles. If you notice any of the signs above, test the relay with a multimeter to be sure. Apparently there are 3 of them connected with the cooling fan. Prevent outdoor fan system issues and keep your home cool by scheduling a Spring Cooling System Tune Up by Sears every year. It seems a simple enough task and circuit. As for running after turning car off. Many automotive relays are similar in design, so you can simply take a relay from a different, noncritical system and insert it in place of the cooling fan relay. To know more details about what are the reasons behind the scenario, keep reading: Faulty temperature sensor This happened to mine maybe a couple months ago. So, be sure to test the relay, as well as its power supply and ground connections. First, you’ll want to check the fuse for the fan relay Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Aug 7, 2014 · The fan motor in WJ is a bit different, and WILL go bad running it at full speed (passing full current demand) the point of the PWM relay is to limit this based the demands from ECM. This small but mighty part plays a pivotal role in regulating electricity flow, ensuring that your heating and cooling systems kick into action precisely when you need Relay compatibility: Look for heavy-duty relays from German car dealers or specialized suppliers as they often offer aftermarket options that can work well as replacements for cooling fan relays. Damaged Fan Relay. It will depend on the engine Jun 3, 2023 · Stuck Fan Relay. My thermostat easily disconnects from it's mounting bracking severing all connections. Another thing that could prevent your thermostat fan from turning off is a furnace fan limit control stuck in the closed position. The cooling fan relay is located in the engine compartment fuse box and is also controlled by the ECM. It can then prevent your air conditioner’s fan and blower motor from receiving enough power to function, causing an AC system malfunction. If your AC relay switch is stuck, you should notice one or more signs of power source Mar 9, 2022 · What is a stuck relay on the AC unit? Relay switches can become jammed or damaged over time, making it impossible for the thermostat to communicate with the fan. Its probably got a stuck contact. Jan 5, 2016 · Usually a faulty cooling fan relay will produce a few symptoms that can alert the driver that service may be required. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Mar 10, 2021 · My engine cooling fan often stays stuck on leading to complete battery drain. Is there a fan relay that is stuck? Where is located? Bryant 394GAD048125 AFEA Series F Serial 1990A00778 May 26, 2024 · Last August, I had a similar problem with my 2017 sedona that the fan relay was getting stuck in close/on position and the fan was running until the battery died (I checked for overheating but the coolant temp seemed fine). Let me know. Nov 17, 2014 · janaya3, in the event I was looking at maybe just a stuck fan relay, I went to the panel and found the 3 fan relays all with the same P/N. However, I've noticed some strange behavior. 95 Mustang GT 331 10. 2012 GL1800 Western PA 03-11-2022, 10:35 AM Nov 15, 2023 · First of all pull out the high speed relay the fan should stop. I understand the question you are asking regarding your 2017 Ford Escape, as the cooling fan relay is stuck on and the check engine light is not on, and the fan is not shutting off. So unless the ignition relay was still on for some reason, I'd think it would have to be the high speed relay. Checking the operation of a fan relay on your vehicle is an easy procedure. If that is the case with your car it may have freed itself but the problem will probably come back. Oct 3, 2015 · I have DiodeDynamics top line HID lows and fogs, even their relay got stuck and I had to replace it after one year. The most common problem on these relays is an open or shorted coil Nov 24, 2020 · Have a look through this thread which mainly suggests a stuck cooling fan relay. 44:1, TFS 190 11R heads, Victor 5. 0 intake, F303, 80s, 76/65, HP hotside, custom coldside, MS3ProPNP Jun 14, 2021 · This only works if the fan is driven by a single relay – as stated earlier, many fan systems have a module, or they may have 2 or 3 relays working together. The relay used is the same as many others in the fuse box. Symptoms include a non-functioning fan and a blown fuse. On your upper fan shroud, kind of under the intake piping going into the air intake heater, there is a 3 pin connector attached to the shroud with a plastic pin clip. If the fan turns off you've found your culprit. Some May 4, 2021 · Stuck AC Relay Switch: A Note. If it was a sensor or something else you would normally get a fault message on the dash. Erratic Fan Operation : The fan may turn on and off inconsistently or behave unpredictably, which is often a sign of a faulty relay. com/carsntoys Tools and Supplies: https://www. Naturally, the relay is supposed to open and close to provide power to the component. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch. Yada yada yada replaced blower motor but now it's stuck on. Presently, the RL3 relay contacts are potentially running "naked". alldatadiy. One of the crucial components that the relay provides power to is the fan. Basically the fan was working correctly, but the board failed and was telling the electric/emergency heating elements inside the unit to stay Customer: radiator cooling fan is stuck on. The role of the fan relay is to function as a switch that activates or deactivates the cooling process. Your AC relay switch can, unfortunately, become stuck in one position. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. The more a relay cycles the more it arks and eventually the contacts will fuse, the contacts may pop apart once the relay cools but it will still be a burnt jagged surface begging to do it again. So, I am going to say the blower relay is stuck closed. If it does not click (or there is no control voltage) then the relay is jammed permanently on. The cooling fan speed is effected by many different conditions and the ECM will adjust the duty cycle from 0–100 percent based on cooling system Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: May 4, 2017 · Cooling fan request The A/C fan request is an input to the ECM from the ATC ECU to request that the engine's electric cooling fan is activated to provide additional cooling for the A/C condenser. If you have taken the thermostat off the wall and disconnected the wires, you can try removing the green wire from the thermostat. If it says blower relay, you’re golden; if it says AC relay, you might have what you want. The first thing you should check is your fan relay. Step 3: Compare the replacement cooling fan relay to the one being removed. I replaced the fan relay #1 and it has been fine since. This arcing generates heat which in turn causes the relay contact to stick together and weld shut in the closed position. The cooling fan relay is a switch that supplies electric flow to the radiator fan. The typical electric cooling fan circuit includes, a temperature sensor, a relay, a control module and the fan motor. Sears Home Services Has Your AC Repair Solution Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Lousy fan relay. The cooling fan relay should be in the underhood fusebox. The HVAC fan relay, crucial for furnace, air conditioning, and ventilation, is a critical component that often goes unnoticed until your comfort is compromised by heat or cold. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Dec 17, 2013 · The fan stops only when the switch is set to 'off', or the thermostat is completely disconnected. Aug 17, 2022 · 3. Engine running hot. Aug 26, 2022 · Why My Radiator Fan Runs Constantly. You should also feel the relay click when you plug it in. Intermittently, when the thermostat ceases to call for heat or cool, the fan does not turn off. Mar 14, 2018 · Find the relay list in the owners manual and identify the fan relay (s). Because there is arching in contacts when they close. The radiator fan relay acts as a switch that turns the fan on and off. The thermostat can’t complete the request if the relay fails. If it says cooling fan relay, it’s talking about the relay that controls the radiator fans. Thanks for the information. As sods law would dictate this never happens in the garage so they say nothing is wrong. Sep 30, 2023 · The relay switch is responsible for regulating the flow of electricity to the air conditioner. Replacement is simple and crucial for maintaining optimal engine temperature. A defective fan relay may be the culprit. Over time, relays can fail or stick together from electrical currents, causing a circuit to stay closed and constantly supply power. A Stuck Cooling Fan Relay . The fan switch {often referred to as a fan relay} has either contact points that open and close or a bimetallic strip which allows electrical current to flow to the fan motor Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Nov 27, 2008 · Probably a green wire from the thermostat goes to the fan relay coil. The relay can malfunction or go bad over time. It would be best to try disconnecting the battery for a few minutes to reset the relay. Apr 30, 2023 · How to Tell if Your AC Relay Switch Is Stuck. Symptoms of a Stuck Relay Equipment fails to turn on or off: If your device stays powered when it shouldn’t, or refuses to start, the relay could be stuck. With the thermostat fan switch 'off', jumpering 24vac to the fan terminal on the relay board causes the fan to start normally. One forum says a bad limit switch is something only a professional should mess with, but could it be something else? Bad/stuck relay perhaps? Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: The cooling fan control module varies the voltage drop across the cooling fan motors in relation to the pulse width modulated signal, which allows the cooling fans to operate at variable speeds. But sometimes it gets stuck in one Jul 15, 2018 · Stuck Relay – Relays in your air conditioner unit help open and close electrical circuits to turn components, like a fan, on and off. Should this have turned the fan motor off. ADDENDA for . A good relay coil will typically read 40 to 80 ohms. It did not. Jul 21, 2022 · How Do You Know If A Fan Relay Is Stuck? A stuck fan relay can cause your blower motor to run continuously, even when your car is turned off. amazon. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Jul 21, 2019 · The fan circuits are hot at all times so it's possible that a control relay has stuck in the ON (fast or slow) position. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Mar 11, 2022 · Likely a stuck fan relay or defective control board. For accurate results, consider using one like the Crenova MS8233D Auto-Ranging Digital Multimeter . Whenever you may have a stuck fan relay, there are a few things you can do to test it. Customer: the blower stays on all the time on A/C mode and off position. Sounds like the same issue and same symptoms. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. You tried turning the thermostat to the off position, nothing works. So the 120V side of the relay stays closed, even when there is no voltage across Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Apr 30, 2014 · Yea, I'd go with stuck on relay as well. com/shop/carsntoys Mult Mar 5, 2023 · The fan relay circuit in the ccrm is normally closed when most automotive relay circuits are normally open. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Dec 19, 2001 · When the fan motor continues to run continuously long after the heater burners turn off, the most likely problem is a fan switch has become stuck in the closed position. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: PROBLEMS IN THE COOLING FAN RELAY CIRCUIT. Stuck Fan Relay. Aug 8, 2016 · The cooling fan relay has an electrical connector that will need to be disconnected and switched over to the replacement cooling fan relay. Either in the TIPM/Fuse box, or the alternate relay box lower in the driver front wheel well. Visually inspect the Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Oct 30, 2022 · 2) Stuck fan relay. When it is stuck in the on position, it will keep the blower motor in its running state. as it is . just tried replacing relay. Checked the furnace and heard loud noise coming from blower motor. Now, the question is why is that one stuck? It's rare for a Cruze fan to go high speed in the first place. The relay has nothing to do with the amount of time the fan run its about the fan speed based on what the coolant temp sensor tells the ECM. Especially if you have an old mechanical t-stat. Aug 12, 2024 · A faulty cooling fan motor relay can lead to engine overheating and inconsistent fan operation. If the fan keeps running, it is a problem with a stuck fan relay. When this relay becomes damaged or stuck in the closed position, the fan could continue to run indefinitely. Non critical would be a light or trailer power relay or similar. If the unit requires more extensive repairs, you may need to repair or replace the outdoor fan motor. Identifying a stuck AC relay switch is crucial to resolving the issue promptly. Dec 26, 2021 · Last week I wanted to add a 5V fan to the other relay but it it wasn’t working so I changed the entire module. Among them, is micro-welding of the contacts is caused by arcing when the contacts close or open. But I would think the latter would keep the A/C on 24/7. I jumped the car this morning and the fan was on immediately so I started tapping all the relays in the engine fusebox compartment. It will cause your AC’s components not to turn off. Sep 3, 2023 · A damaged relay may get stuck and prevent your unit from running efficiently. Just keep in mind that many modern cars use electronic relays. Here’s how to tell if your relay is acting up: 1. Otherwise, the fan controls, circuits, and schematics can be found in an online subscription to the GM/Cadillac service manuals through www. Am I correct to believe the blower motor fan relay is stuck on? Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Aug 26, 2016 · Step 1: Locate the relay. Subscribe: http://youtube. The relay is the component that fails most often. Whack it with your screwdriver handle and see if it drops out. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Nov 27, 2017 · I want the fan to turn on whether calling for heat or cool, hence the OR gate. A stuck relay can also be responsible for the cooling fan coming on even though the engine is cold. If you have checked the above 4 parts and still do not find any abnormality, the problem may come from the least expected part – the stuck fan relay. Just swap another, non critical relay of the same type into the slot and see if it stops running. Mar 4, 2025 · Outdoor fan motor stuck: Dirt or rust may have caused the fan to get stuck. The fan relay is an electrical switch that connects the fan to the vehicle’s electrical system. _____ 2018 KZ 270thle 2015 Silverado. It is a four pin normally open relay. When you select the fan to run and when you are calling for A/C, this wire picks up the fan relay which turns on the blower. Nov 21, 2024 · Wiring harnesses and electrical connectors play a crucial role in transmitting signals between the fan control module and the fan. The relay activates the fan when the engine gets a certain temperature and also shuts down the fan when the temperature drops. 5. I switched then one at a time with no success, fans still running with a cold engine. Maybe removing fuse next? Mechanic's Assistant: How many miles are on the Saturn? Testing low and high speed cooling fan relays. Looks like I am dealing with a wiring issue. The condensor fan relay is the same usually. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise:. You can usually swap a relay that looks similar under the hood for a quick test just to see. 1. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: The fan switch on the thermostat is in the auto position, not the on position. It will be in the fuse box under the hood. This can lead to a dead battery, as well as other problems. e use a voltmeter or a test light. Disconnect connector and remove cooling fan relay. The manual may refer to a blower relay, an AC relay, or a cooling fan relay. for those 3 associated relays. Most commonly used connectors are a push type connector. The C3-5 and 7 run capacitors are regulating the motor speed AND serving as "quasi snubbers" . By doing so, it tells the fan when to blow and when not to. Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Blown fuse or malfunctioning relay; Bad fan motor or wiring issue Issue with the fan control module; Issue with the coolant temperature sensor; Obstructed fan blades; If the fan is running all the time: Faulty coolant temperature sensor; Stuck fan relay; Issue with the fan control module or wiring; If the fan is rattling or making too much noise: Oct 16, 2024 · Fan Continuously Running: Sometimes, the relay can get stuck in the “on” position, causing the fan keeps running, even when the engine is cool. The relay will stick or stay in the open state when it is in bad condition. The clutch receives a pulsed digital signal, not a straight all on or all off. dmafjprzlaocadgfepvyfprbfvcabrbnkgdwcrxjxbmumlevrwhscjypebqphfnggbod