Automotive Air Conditioning Information Forum (Archives)

kevinprince on Thu March 24, 2011 2:58 PM

Year: 2007
Make: Freightliner
Model: Columbia
Engine Size: 6cyl
Refrigerant Type: 134
Country of Origin: United States

My a/c comressor stays on. I have all the dash switches turned off, yet the ac compressor continues to operate making cold air come out the vents when going down the highway. Only way to get it to stop is to unplug the compressor. Any ideas? Thanks

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Kevin Prince

JACK ADAMS on Thu March 24, 2011 3:18 PM

If you can get a hold of a wiring diagram, trace the clutch circuit to see if you have a clutch relay that may be stuck closed. Hope this helps and good luck..

kevinprince on Sat March 26, 2011 4:59 PM

That fixed the problem. There was a HVAC relay. I replaced it and now it works great. Thanks for the advice

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Kevin Prince