1989 firebird electric fan not working
02-19-2019, 09:42 PM
#1
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1989 firebird electric fan not working
fan won't kick on when engine overheats.
when you turn on the a/c the fan kicks on.
had someone look at it and said the ecm is the issue.
replaced the ecm and no change.
checked thermostat and is ok.
I guess I could test the wiring from the thermstat to the ecm and see if there is current.
any ideas?
when you turn on the a/c the fan kicks on.
had someone look at it and said the ecm is the issue.
replaced the ecm and no change.
checked thermostat and is ok.
I guess I could test the wiring from the thermstat to the ecm and see if there is current.
any ideas?
02-20-2019, 09:32 PM
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Car: 92 Camaro RS
Engine: LO3
Transmission: T5
Axle/Gears: stock
Re: 1989 firebird electric fan not working
The fact that AC turns on the fan shows the relay to be working fine. Depending on the engine and fan setup it sounds like a common failed fan switch. Tell us which engine
and whether you have single or dual fans
and whether you have single or dual fans
02-21-2019, 09:33 AM
#6
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Car: 1989 Firebird
Engine: 5.7 LS1
Transmission: T56
Re: 1989 firebird electric fan not working
There are two "temp sensors" on the car, one drives the fans and one drives the gauge. If you take the wire off the fan switch and touch it to ground with the key on the fan should start up. If it does the switch is bad, if it doesn't then you have a wiring issue or relay issue.
02-21-2019, 11:30 AM
#7
Re: 1989 firebird electric fan not working
There are two "temp sensors" on the car, one drives the fans and one drives the gauge. If you take the wire off the fan switch and touch it to ground with the key on the fan should start up. If it does the switch is bad, if it doesn't then you have a wiring issue or relay issue.
Like you mention a cylinder head temp switch that’s normally open circuit.
To the op if you want help diagnosing the issue instead of throwing parts at the problem. You need to state what your working on. Your signature is incomplete.
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02-21-2019, 12:16 PM
#8
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Car: 92 Z28
Engine: Ramjet 350
Transmission: T-56
Axle/Gears: 3.23 Torsen
Re: 1989 firebird electric fan not working
This might not be the issue but just a tip for those who are experiencing the same problems. Happened to me once were my fan wouldn't turn on. The issue was that the contacts on the fan plug were so bent that they weren't making contact. Just took a small flathead and opened up the contacts and problem fixed. 
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