i have a 1991 firebird formula 350 tpi all stock, anyway when i turn the key before i start the car the passengers fan comes on an stays on what causes this i need some help??

also i noticed that when i turn my a/c on that the drivers fan does not come on, would this have to do about my a/c needing a charge??

 

some one, anyone??

 

Passengers side fan is run by a temp sensor between the # 6 and 8 cylinders. There may also be a relay on the drivers side firewall. Mine was the temp sensor.

Yes, if your A/C needs to be charged, the high pressure switch won't trip activating the driver's side fan.

Good Luck!

 

thanks alot man, i looked at my temp sensor and for some reason its toated/burnt and all messed, so i am putting on another soon.