My vacuum pump is running a lot?? - Ford Powerstroke Diesel Forum
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Old 06-20-2008, 06:36 PM
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My vacuum pump is running a lot??

My vacuum pump is running a lot and my auto 4x4 will not work all the time. When I have my air blowing out the vent or floor and I turn the 4x4 switch the air will switch to defrost when the selector is still on vent. My 4x4 hubs were recently replaced and thatís when it started. I tried disconnecting the air supply to the four wheel drive and plugged it off but the pump still runs a lot. ANy ideas? Thanks!!!
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Old 06-20-2008, 06:38 PM
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You have a vaccuum leak somewhere. I suggest you get something like the mighty vac vaccuum tester. Hook up to all the lines coming off the pump. You will find the leaky line.
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