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What kind of sensor controls the fans - 2001 Mitsubishi Eclipse Spyder

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  • Jeff Turcotte
    Jeff Turcotte Apr 09, 2011

    coolant temp sensor



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Fan module, and or coolant temp sensor.

Posted on Apr 09, 2011


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I would recommend you not drive it if it is overheating. You can cause some very serious damage in a very short time. The cooling fans are controlled by relays. If the fuses are fine, I would check those next. The relays are controlled by the body control module. If you have a way to check it for codes (OBD II, I'm guessing) then you might try that next. If the relays are OK, you may have a wiring problem or the motors could be going bad. Have you checked your wiring harness and connectors for any signs of damage or melting? A bad ground connection could cause them to stop working.

Disconnecting a sensor - any sensor - is not the best approach to this kind of problem. It wouldn't make the fans run continually, anyway.

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There is a switch that monitors the coolant temperature and perhaps this is faulty and your fan is not being turned on. If your car has been serviced lately (rad replaced) the fan may not have plugged back in. Follow the wires from the fan motor, there is usually a connector inline as well as a connector at the sensor. All models are different but this is a free and easy first step. Keep your finger away from the fan blades, they can start unexpectantly.

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Fan not coming on. car running hot.

Either the fan motor is bad, or the temp sensor that controls it. It is usually the sensor. What kind of car, year make, model, engine?

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My 2000 Oldsmobile 3.5L intrigue is overheating, needle go slighty above 1/2 mark. Replaced coolant temp sensor, thermostat/housing, water pump is working, both radiator fans working , but spinning kind of...

Check to ensure fans are getting enough amperage to run at proper speed. turning your heat on removes heat form the engine and puts it into the passenger compartment. It could be possible that a sensor on the fan is not allowing the fans to spin fast enough or the fans may have a sensor which controls the speed of the fan to coincide with the heat that needs to be removed. Generally, your thermostat needle should sit just slightly below half. Do not run engine anywhere near the red zone as damage can result

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Radiator fans won't shut down

The fans are controlled by the Engine Coolant Temperature sensor mounted in the coolant hose at the top front of the engine. Disconnect the electrical connector and see what happens. Fans should not run. If that cut the fans off replace the ECT sensor.

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Location of fan relay on mt 99 dodge grand caravan 3.8 l motor ?

Thank you for the inquiry.
Fan control is accomplished two ways. A pressure transducer on the compressor discharge line sends a signal to the Powertrain Control Module (PCM) which will activate the fan. In addition to this control, the fan is turned on by the temperature of the coolant which is sensed by the coolant temperature sensor which sends the message to the PCM. The fan will not run during cranking until the engine starts no matter what the coolant temperature is.

CAUTION: The solid state fan relay is attached to the left frame rail near the lower radiator support. The relay bracket, and fastener are used to dissipate heat from the relay. Ensure the relay is properly attached to prevent the following:

Intermittent engine overheating.
Relay "thermal" shutdown, or relay damage.

Hope helps; keep us updated and remember to rate this answer.
Kind regards,

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There should be a fuse/relay box in the engine compartment close to the battery, If your vehicle is equiped with two fans, there should be two relays. There has to be a cooling fan(if equiped with two) that comes in as soon as you turn the A/C on, is your vehicle has one fan, it has two speeds, when the A/C is turned on, the Hi speed kicks in. Sensors in this circuit that are relevant to this function are, Coolant Temp. Sensor, Engine Temp. Sensor.

Check fuses/relays for the cooling fan(s), if OK, check sensors.

Good Luck!! Don't forget to rate this post!!!

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I don't thing there is a short there is radiator fan switch that control these fan, it works off of heat. There is also a fan relay that control look in fuse box inside the hood for fan relay and make sure its NOT stuck , if it isn't then its the fan switch.This switch may be bad and cause the fan to turn on. Replace radiator fan switch located on water outlet on engine and this should solve your problem. A

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