Cooling fan won’t turn on...
Thread Starter
Member
Joined: May 2016
Posts: 120
Likes: 1
From: Rome, Italy
Car: Pontiac Firebird Formula
Engine: 3.1 LH0
Transmission: 700R4
Axle/Gears: Automatic
Cooling fan won’t turn on...
Ok, today I took the car for a ride. Once stuck in a traffic jam the engine temp was climbing, and the fan didn’t switch on. I stopped the car to cool down it and I drove to the garage. If I jump the terminal A-B in the ALDL socket the fan doesn’t start. The engine is a 3.1 V6 Lh0. How can I do a fan test?
Thanks!!
Thanks!!
Joined: Aug 2009
Posts: 1,821
Likes: 40
From: Central California
Car: 92 Camaro RS
Engine: LO3
Transmission: T5
Axle/Gears: stock
Re: Cooling fan won’t turn on...
Probably first check the fan relay and see if it looks burnt on one of the terminals. If that's good put 12 volts on the fan to verify if it's working. Does it work when you switch AC to on?
Thread Starter
Member
Joined: May 2016
Posts: 120
Likes: 1
From: Rome, Italy
Car: Pontiac Firebird Formula
Engine: 3.1 LH0
Transmission: 700R4
Axle/Gears: Automatic
Re: Cooling fan won’t turn on...
I still haven’t tried, which one is the fan relay on the firewall?
Joined: Aug 2009
Posts: 1,821
Likes: 40
From: Central California
Car: 92 Camaro RS
Engine: LO3
Transmission: T5
Axle/Gears: stock
Re: Cooling fan won’t turn on...
I have a Camaro not sure where on FBs. You could follow the wiring back from the fan. The relay will have only four wires going to it, two big ones for power in and out, and two small ones,
one for 12 volts with key on and one for the ground trigger from either the fan switch or ECM whichever yours uses
one for 12 volts with key on and one for the ground trigger from either the fan switch or ECM whichever yours uses
Thread Starter
Member
Joined: May 2016
Posts: 120
Likes: 1
From: Rome, Italy
Car: Pontiac Firebird Formula
Engine: 3.1 LH0
Transmission: 700R4
Axle/Gears: Automatic
Re: Cooling fan won’t turn on...
Thanks henry, I just jumped the two red and black red wires from the connector: the fan starts up and the fuse is ok. Maybe a relay issue? Or a bad connection to the dkgry/white wire? Can I chack it easily? Maybe the coolant sensor?
Joined: Dec 2004
Posts: 16,771
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
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Thread Starter
Member
Joined: May 2016
Posts: 120
Likes: 1
From: Rome, Italy
Car: Pontiac Firebird Formula
Engine: 3.1 LH0
Transmission: 700R4
Axle/Gears: Automatic
Re: Cooling fan won’t turn on...
Fantastic, I really appreciate your help!! Now it’s crystal clear!! Thank you guys!
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