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Old 11-09-2011, 01:30 PM
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Fathers Truck, stuck on defrost

How many things can cause the diesel trucks to be stuck on defrosters?
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Old 11-09-2011, 01:39 PM
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Mine did the same thing back when I owned it. It turned out to be a vacuum leak in the hub because it only did it when I switched to 4 wheel drive.


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Old 11-09-2011, 01:51 PM
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He either has a vacuum leak at the reservoir, bad line, or a bad vacuum pump. If the pump is good, you will hear it running with the engine off and key on.
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Old 11-09-2011, 01:56 PM
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Ha howdy zaairman

I'll have to have a listen, I do remember hearing vacuum pump before. I think he has no 4x4 or any climate control. Sounds like vac leak, prob at the reservoir. Where's that at?
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Old 11-09-2011, 03:00 PM
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Passenger side of the engine compartment.
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Old 11-09-2011, 05:09 PM
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It's common for the vac lines that go to the front axle hubs to crack and leak.
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Old 11-09-2011, 05:23 PM
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Appears that the solenoid on the passenger fender for 4x4 auto-hubs does not seal, allows vacuum to atmosphere. Though I'm confused, switching to 4x4 does eventually slowly pull (probably slow because I keep breaking the circuit, making the pump run constantly) to 14" of vacuum then it dumps to 0.
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Old 11-09-2011, 05:24 PM
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Quote:
Originally Posted by ttyR2 View Post
It's common for the vac lines that go to the front axle hubs to crack and leak.
Those rubber lines are shot, will be replaced asap
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