i got a 94 trans am.. and ever since i have owned it.. 5 months now.. the fans won't turn on.. i have replaced all the sensors, relays, the engine wiring harness and computer. the computer is reading the coolant temp cause i can read it through my scanner and it also shows that its sending power to the relays but the fans don't turn on.. either of them.. but i can make the fans work by using a jumper wire at the relay.

 

Does the temp gauge peg in the red? In stock form, the LT1s run pretty warm from the factory. http://shbox.com/1/4th_gen_tech2.html#cooling

 

The PCM does not send power to the relays, but it does send a ground to operate them. Do they come on if you jumper the DLC?

 

it was the fuse.. i am a tard.. i never actually took it out to tested it, just glanced at it frome the side and you couldn't see that it was blown unless it was removed..

 

That seems the be the same problem I am having in my 96. That link helped a lot, I got to check that tomorrow!

 

Like i said before I am having that same problem. I have replaced the fuse since I found that it was blown but it keeps blowing the fuse? What do I do know?

 

I would double check the grounds and connectors for starters. Wiring faults can lead to excess current draw which will pop the fuse.

 

I had the same problem with the fuse to the fans always blown, 20 amp? It turned out to be a seized air pump, must be on the same curcuit. Just a heads up, that was my problem. I replaced the air pump, all is good. Hope this helps some.

Colin

 

Interesting. My fans never run. I recently deleted air and the pump was full of junk. Also my car never runs above about 185 w/160 thermo. Maybe I should check to see if they work.