Thread: Coolant fan only works with A/C on

98 Grand Prix SE 3.8. coolant fans only work when A/C is on. Common problem? Willie

Check the temp. sensor. Sometimes that is the problem, the fan comes on with the AC to allow it to cool the car while sitting.

Okay , thanks. Will

Originally Posted by Southern Yankee

Check the temp. sensor. Sometimes that is the problem, the fan comes on with the AC to allow it to cool the car while sitting.

I got the car up to 210 and nothing happened, I then tapped on the temp sensor and the fans started working. Huh?
Thanks for your help on this one. Hope the new sensor is cheap.
Will

its cheap. if you hooked a scanner too it, you would see the temperature probably reading something crazy low, thats why its not kicking the fans on. your gauge is gonna work though, since its a 3 wire sensor, one goes to the gauge, one goes to the computer.