Vacuum problem - Ford Powerstroke Diesel Forum
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Old 11-18-2012, 06:04 PM
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Vacuum problem

I just noticed the other day my auto hubs are not locking when I put it in 4x4. Also the a/c is coming out the defrost. Then today I tried them again and they both worked correctly. Trying to figure out if its the vacuum pump or the phv solenoid or whatever that's called. Thanks for any help
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Old 11-18-2012, 07:29 PM
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This is what the vacuum pump sound like from close up.You should hear it on most cold start-ups. If you bleed-off the vacuum, it should start running.

Powerstroke 6.0l Pre-start noise - YouTube

Powerstroke 6.0l Pre-start noise - YouTube
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Old 11-18-2012, 11:32 PM
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Follow the vac lines down and spray shaving cream over them, if you have a leak in the lines which is common it'll start sucking the shaving cream in and you can replace that line. The shaving cream won't wreck anything either

Sent from my HTC One X
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