Coolant fan only works with A/C on

[bigwillie]

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

[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.

[bigwillie]

Okay , thanks. Will

[Toofastgs]

your cooling fans should kick on around 210° if you dont have a reprogramed pcm

[bigwillie]

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

[minichopper6hp]

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.