Why would a/c compressor run all the time while driving?
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More Turbo
Joined: Aug 2006
Posts: 683
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From: North Georgia
Why would a/c compressor run all the time while driving?
This is a question in general about Fords. My 98 Ranger doesn't do it but a friend asked me if I could get some suggestions. He's got a 1987 Ford Mustang 5.0 with original factory a/c. He changed his compressor to a used one and it started running all the time whether the **** was off or on. He said he switched back to his original compressor and it still does it. I figured it might be something common for Ford a/c systems so I figured I would ask. I'm not sure why it would be unless the mode switch was bad. Any ideas?
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Joined: Mar 2012
Posts: 266
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From: WA
If the A/C is running when the HVAC switch is in the off position then maybe the relay for the A/C is stuck in the on position? A total guess on my part that the A/C will have a relay. But if it does then you may be able to smack it with a wrench a few times to see if it loosens up.
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
If the A/C is running when the HVAC switch is in the off position then maybe the relay for the A/C is stuck in the on position? A total guess on my part that the A/C will have a relay. But if it does then you may be able to smack it with a wrench a few times to see if it loosens up.
^+1, Good reading catch on the A/C operating with the switch in the Off position, so yes, swap the A/C power relay out for a like known good one, or Thump the one in there now & see if it'll wake up & act right & let us know what you find.
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