1992 Chevy Lumina 6 cylinder radiator fans not coming on

Relay

Yea Scott I think it's a relay to. You know I took it to a shop and they said it worked fine, this was a couple of years ago. Could it be that the relay was working off and on and now it's gone all the way out. Yea, I'll put a meter on it today but I've pulled the motors and check them,that was easy. I don't have a meter, got to borrow one, but I'm going to change the relay if it needs it or not. I've ran the car with the air on in 90 degree heat for an hour and still no fans either one. Thanks , I'll let you know how it goes.

Roscoe

Try this: Ground the diagnosis terminal. Looking at the scan tool connector under the steering wheel, connect the two terminals top row to the right. Just bend a short piece of wire and plug it into the two connectors. Turn the key to on. The fans should come on.

If they do not turn on, check fuses and replace relay with known good one.

Report results.

Just noticed that both fans use the same ground location. Check that too.

Thanks for all your help Scott,

I called it a day on Sunday, I'll report back and let you know again thanks, this is driving me out of my mind.

Hi Shep & Scott,

I live paycheck to paycheck and get paid next Friday. I tried the wire and the fans did not come on. Will replace the relays and let you know. Thanks Roscoe

It seems extremely unlikely that both relays would go bad at the same time. You can swap with a known good relay and redo the test. If still no go, I'd check the grounds. Easiest way is to remove the fan connector and use a multimeter to check for continuity to ground. If this checks good I can give instructions on how to probe the relay socket to see if the computer is sending voltage.