AC and 4WD problem - Ford Powerstroke Diesel Forum
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Old 07-15-2012, 07:17 AM
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AC and 4WD problem

I noticed a while back that when I engage the 4WD with the AC on, the AC turns off after a few seconds. When I disengage the 4WD the AC will come back on. Blower stays on but the compressor shuts down and blows hot/warm air. I'm guessing that there is an electical or vaccume issue somewhere. Anyone have a idea where I should look first?

Thanks!
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Old 08-01-2012, 06:42 PM
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Solution

There is a vacuum switch just behind the right passenger battery on my diesel.

It supplies vacuum to engage the automatic hubs in 4 wheel drive. Cost $35 or so.

Search something like 4 wheel drive not engaging and there is a lot of info on this forum.

KG
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Old 08-03-2012, 08:00 AM
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Thanks for the help. It turned out to be the vacuum switch that was bad. All is good again.
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