1989 firebird electric fan not working
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Joined: Nov 2017
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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?
Joined: Dec 2004
Posts: 16,906
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 firebird electric fan not working
What engine ? V6 2.8l or v8 tpi or tbi ?
The thermostat doesn’t control the fan, either it’s ecm controls the relay or there is a cylinder head temp switch.
The thermostat doesn’t control the fan, either it’s ecm controls the relay or there is a cylinder head temp switch.
Joined: Dec 2004
Posts: 16,906
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Joined: Aug 2009
Posts: 1,821
Likes: 41
From: Central California
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
Supreme Member
Joined: Jun 2002
Posts: 2,227
Likes: 46
From: North East GA
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.
Joined: Dec 2004
Posts: 16,906
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
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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Senior Member
Joined: Sep 2014
Posts: 749
Likes: 39
From: Los Angeles
Car: 92 Z28 Clone
Engine: Vortec 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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