Defrost not working!
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Elder User
Joined: Mar 2011
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Defrost not working!
Defrost not working. Looking for the vacuum pump so I can troubleshoot it. Can some tell me where to find it in the engine bay and advice on trouble shooting it other than listening to whether it's on or not when engaging 4x4? Thanks, JC
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Joined: Aug 2008
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From: Frederick, MD
Vacuum Pump
The vacuum pump is located on the
upper portion of the front cover and is
driven by the high pressure fuel pump.
Vacuum is used for the EGR cooler
bypass system and the wastegate
control system.
The vacuum pump is located on the
upper portion of the front cover and is
driven by the high pressure fuel pump.
Vacuum is used for the EGR cooler
bypass system and the wastegate
control system.
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Super Moderator
Joined: Aug 2008
Posts: 37,375
Likes: 1,860
From: Frederick, MD
If you follow the vacuum line from the degas bottle to the front of the motor by the HPFP then you should see it with a flashlight.
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Joined: Nov 2013
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From: Hempstead, TX
https://www.ford-trucks.com/forums/1...il-leak-4.html
There may be some helpful information in there about your pump. There are a few pics.
There may be some helpful information in there about your pump. There are a few pics.
Elder User
Joined: Jul 2010
Posts: 501
Likes: 1
From: Pacific NW
You're thinking more about "Hydro-boost" which is a totally different system and method, but it performs all the same work as what a vacuum pump on the powerstroke does.
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Elder User
Joined: Mar 2011
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I went to the dealer and looked at the fiche. Looks like the vacuum pump doesn't run the hvac flapper like previous trucks. There is an electric motor now. I picked it up for $160 but I think I need to rip the dash apart to replace it. 
