cooling fan problems

[86irocz4me]

I have an 86 iroc and the cooling fan won't come on unless the a/c is on or it is in diagnostic mode. I have replaced the coolant temp. sensor and the computer for a totally different problem. It worked before I replaced the computer so I took the new one back and got another one and it did the same thing. There are two sensors on the intake and I replaced the smaller two prong cts. I need help!

thanks<br />David

[n00dle]

hey man i have the same problem i replaced the switch on the side of the engine and the relay for the fan and still it only turns on when the a/c is on. i havent done alot of searching yet but i just got a job at a mechanic shop so i am gonna try an get them to help me if not then i am gonna put in a switch if i get tired of trying to fix it. also i know it to be a common problem because my buddy with a 92 also has this problem. if i get it figured out i will let you know. good luck

[Lethalrides2k3]

easy fix is to wire in a switch tot he relay for the fan i had to do that on my gfs rs fan wouldnt come on till like 200 something and the car would overheat in traffic now the relay causes an open ground to shut the fan off and closes ground to turn it on so what u have to do is wire the ground so its always grounded then find the 12 volt switch side of the relay and run a wire to a toggle switch from there just tap inot an unused circut in the fuse block that way works on a single fan setup not sure how to do it if u have dual fans but should be pretty much the same thing after doign it on my gfs car and droping in a 180% thermostat the car runs down very cool all the time since we leave the fan on all the time unles scrusing on the highway