cooling fan constantly runs
Thread Starter
Pro
Joined: May 2012
Posts: 520
Likes: 9
cooling fan constantly runs
even with the car not running but as soon as i turn the key to on on it goes.bAC was removed so i shorted the connector on the plug, still they run. No codes are flashing or any check engine lights. its an 89
Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Here is info from my 86 service manual, use it to see why it is stuck on with ignition. ECM, stuck relay, short to ground, are a few likely suspects.
http://members.shaw.ca/corvette86/Co...%20Control.pdf
http://members.shaw.ca/corvette86/Co...%20Control.pdf
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Which connector did you short?
There is a switch in the AC circuit that tells the ECM that the AC is on. The ECM then turns on the cooling fan to help the condenser do its job. It also raises the idle to compensate for the extra load of the AC compressor. If that's the connector that you shorted then remove the short and your fan should stop running.
There is a switch in the AC circuit that tells the ECM that the AC is on. The ECM then turns on the cooling fan to help the condenser do its job. It also raises the idle to compensate for the extra load of the AC compressor. If that's the connector that you shorted then remove the short and your fan should stop running.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The switch with the green and black wires is the fan control switch. The high pressure switch is the one with the large diameter connector that looks the same as the low pressure switch connector.
Are you sure it's really shorted? It sounds more like it's open and the ECM thinks the AC is on so it turns on the fan.
Are you sure it's really shorted? It sounds more like it's open and the ECM thinks the AC is on so it turns on the fan.
