what wires were jumped at the relays? if all he did was jump[ the orange(or red) wire to the black/red wire, all that proves is the orange(red) wires have power

you can have one power missing at the relay and the fans not come on, plus, only 1 fan is controlled by the ECM, but the fuse for the brown wires effect both, and the fusable link for the orange(or red) wires will also effect both

 

Well here is where he said he jumped the relays.
But then agine when I had my 85 camaro it was a 2.8 and had one fan.
Just trying to help.
So if he jumped the relays then he must be getting power to the relays and the wires to the fans must be ok because he said they turned on.
So at this time I'm kinda stumped too.


Chris G.

 

there are 2 different power feeds, one is the one that is sent through the relay to the fan and onbe is needed for the relay trigger to work, if it has the feed, but not the trigger, he can jump the relay nconnector and get the fan on

that is why he needs to respond, but you saying ECM is bad is not the answer, it is possible for a bad ECM to stop 1 fan from coming on, but not both

 

I understand.

 

Ok, slow down.

Now you know the fans are OK...
I remembered too, today, that if you access the ALDL(codes) it will test the cooling fans and relay by switching the fans on.

Is your A/C charged, and working?? If NOT, the fans will NOT come on when you switch on the A/c.

If you have tried a NEW relay in the Fan #1 slot and let it get above 210* and it still doesn't come on, oops, '92 model means coolant sensor is bad, no fan switches there...
The sensor has a black wire and a yellow wire up in the front of the intake area. This sensor is for the ECM, the single wire one in the head is for the gage.

 

ok ok whoa lol, lots of info..

1. Ok my a/c is f'ed...i dont have a drier canister on there so two wires arent even connected on the a/c so i assume this is why my heater and a/c controls wont turn it on.....BUT shouldnt this fan come on bc the engine gets too hot(using the fan switch as a means of knowing how hot the engine is?)

2. I replaced my coolant temp sensor...its on the intake...just below the line that feeds coolant to my throttle body.

3. I even took the bracket with all the relays and stuck them on the blower motor b/c i KNEW that was working...i plugged the blower motor connector into all the relays that are connected to that bracket on the drivers side firewall. ALL those relays let the blower motor come on when i used the fan controls inside the car..

anything else?

 

1) you have no fan switches on an '90-up, they are controlled by the ECM, informed by the coolant temp sensor, black and yellow wire.
2)If you've replaced it and the wiring is ok, you PROM chip is probably screwed.
3)sorry...
4) you probably can bandaid fix it by wiring the fans to come on when the key is turned on, wire relay plug to a keyed 12v source.

 

went outside..now idk how accurate this is but w/e

I went outside and took a look at my coolant temp sensor...it had some residence of coolant on it and the i took the plug out...and it was actually wet too?....but i have been messing with my intake alot lately and coolant has been spilling out alot so that could be why its got coolant on it but w/e. And i wasnt sure how far to tighten the new sensor when i pulled it out...i i just went over it again and it wasnt really tight at all (but i was using a torque wrench to tighten it so it felt like nothing.) But i notice only around the sensor was there really coolant...so maybe it was leaking at the sensor...im sure that would throw it all off right?

 

My prom should be fine b/c i had a new prom in there set for 30s and deleted emissions and it still didnt turn the fans on. Then i pulled that prom and went back to stock injectors and stock prom

 

and i do have a fan swtich...its on the passanger side of the block...i had a low temp 1 when i got the car...now its back to stock..

 

Possible if it was in the plug, also be sure NOT to use sealant of any kind on it, it won't ground correctly. The sensor is tapered so it will seal as it tightens, just DON'T over-tighten it, like all the way to the base..been there helicoiled that..

 

Where exactly and what color wire?? I have a '90 IROC, no fan switches, believe me..

 

Yea lol...i was terrified to tighten that too far..thats why i left so much thred out...now its got a decent amount of thread left to go and is much much tighter...so hopefully it will come on when i get the damn thing back together for the 10000000th time.


Ill keep everyone posted

 

Its got the same connection type as the knock sensor...similar plug or w.e...i actually mixed them up before this and thought that that was my problem lol. My engine was throwing 43 and then i just switched this plug and the knock sensors and the code went away and the car came back alive (it was really sluggish). Its right between cly...6 and 8 i believe is what they are... its right NEXT to the dipstick...idk the color of the wire connection...but it was on my wiring diagram in my haynes book...

 

every diagram i have found shows a fan switch on a 92