Radiator fan turning on, on cold engine?

SVET

MEMBER
2003 MITSUBISHI OUTLANDER
2.0L
4 CYL
4WD
MANUAL
130,000 MILES

Hello there. Recently I noticed that my car's radiator fan is turning on when I turn the ignition on even before I have started the car, it goes for like 10-20 seconds then stops. The same happens when I turn off the car, it runs for 10 then stops. The car warms up and keeps the temperature as normal. How can I fix this?
Thank you in advance!

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,526 POSTS

It sounds like the engine coolant temperature sensor is not working correctly, I would try to swap it out which should fix the problem. Here is the location so you can check it out. Check out the images (below). Please let us know what you find.

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Thursday, March 30th, 2023 AT 10:10 AM

SVET

MEMBER
18 POSTS

Thank you for the answer. Do you know how to test the electric fan controller in case that's the problem?

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Friday, March 31st, 2023 AT 2:13 AM

KEN L

MASTER CERTIFIED MECHANIC
47,526 POSTS

Yes, you can ground the blu/wht wire from the controller and the fans should come on, you might want to check the ground wire to the controller as well, here is the wiring diagram so you can see how the system works. Check out the images (below). Please let us know what you find.

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