Cooling fan never turns off.
Thread Starter
Racer
Joined: Apr 2007
Posts: 291
Likes: 0
From: Lakewood CA
Cooling fan never turns off.
As soon as I turn my key forward (before the car is even started) the fans will turn on. I have no idea where to begin and I couldn't find any information on this. This is for a 93 C4, by the way. Thanks!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Check to see if the 2-wire switch is plugged into the A/C pressure line.
If it is, remove the connector and verify that the switch is closed by measuring resistance across the contacts is zero.
If it is, remove the connector and verify that the switch is closed by measuring resistance across the contacts is zero.
Thread Starter
Racer
Joined: Apr 2007
Posts: 291
Likes: 0
From: Lakewood CA
Air conditioning Clutch relay and/or cooling fan relays. Check with digital Ohm meter, replace if less than 18 Ohms. If relays OK, potential ECM failure.
So, is this the connector you are talking about? The only two wire connector I could find on the AC line was by the dipstick, right next to the stainless steel braided fuel lines. It looks like removing it would let gas escape. I am going to need a better description of its location if that isn't it.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I am going to need a better description of its location if that isn't it.
That is the A/C Coolant Fan Sw; when pressure builds too high in that line the sw opens and the ECM turns on the coolant fan.
There may be two connectors (my '88 has two), the one to which I refer is the smaller and has a release tab on the side of the connector.
