With all the chatter about the AUX Cooling fans I decided to check the operation of mine last night. Here is what I found...

The AUX cooling fans do not turn on with the A/C. If I pull the plug on the temp sensor (thermostat housing) the fans switch on to high speed, reconnect plug and fans shut off.

As engine warms up the fans will kick on low, and shut off when the engine temp drops.

I did some research back and have found some posting about checking the freon pressure sensor (red w/ 2 leads). I will check this tonight. I have read in the archives about a fuse on the relay for AUX cooling fans, will this fuse only take out the cooling fan from running with the A/C or will it disable them all together.

Any input would be appreciated. Thanks!


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1990 300CE-24
1995 Jeep Wrangler
1995 Ford Thunderbird