Radiator Fan not kicking on

GINO82109

MEMBER
1990 CHEVROLET LUMINA
6 CYL
FWD
AUTOMATIC
100,000 MILES

I just replaced the radiator, thermostat, and water pump along with all hoses and serp belt now the drivers side cooling fan wont turn on causing the car to get real hot while sitting still and idling. The temp gauge works fine, and the passengers side fan ( the one that turns on with the a/c ) works but only when the a/c is running. I was thinking temp sensor but wouldnt the temp gauge not work if this were the case? This car is my baby so please help I put too much money into my car I am going to try to fix this problem myself any suggestions will be greatly appreciated - Gino
CAR IS: 1990 Lumina Euro 3.1 V6 4 door
MILEAGE: just turned 100,000

3 Replies

SATURNTECH9

MECHANIC
30,869 POSTS

If your temp gauge say's your over heating then you wouldn't think it was the coolant temp sensor.I emailed you the trouble tree for your cooling fan inop with a wire diagram. Let me know what you find and we will go from there.

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Tuesday, April 6th, 2021 AT 7:56 PM

GINO82109

MEMBER
4 POSTS

Where is the fan switch located? After studying the documet you provided I have an inclination that the fan switch may be the problem and its a cheap fix anyway plus I live in Houston, Texas and its real HOT so I think after replacing damn near every other component of this car short of the transmission (knock on wood) I should go ahead and replace the fan switch regardless to avoid further complications (even though everyone tells me " if it aint broke dont fix it ") Again I really appreciate your help and this web site is a life saver. Thanks> -Gino

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Tuesday, April 6th, 2021 AT 7:56 PM

SATURNTECH9

MECHANIC
30,869 POSTS

There is the location before you change it unplug it and while the car is running jump the terminal's of the connector connecting the two terminal's together.If the fan kick's then replace the sensor if it doesn't kick on you will have to follow the trouble tree i emailed you.

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Tuesday, April 6th, 2021 AT 7:56 PM