vac pump wont shut off, ac only on defrost - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 06-04-2013, 07:25 AM Thread Starter
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vac pump wont shut off, ac only on defrost

This last week I was on vacation and my AC stopped working right. The air will only go to defrost. I read around a bit and know I have a vacuum problem. I checked the few things that people specifically said in other posts like the gray tube that often un plugs and it looked good. It also seems like all of the other tubes and hoses are connected where they ought to be.

Last night while going over things again I did key on engine off and the vac pump turned on but didn't turn off. When I pulled a line and stuck my finger on it there was suction so I think the pump is good. People have said that they test for leaks at the hubs and whatnot but I'm a total noob and don't know how to do that. Can someone help me out and describe the process and maybe suggestions on what lines and where they are to check.

Thanks. I was in Moab doing a little bit of off roading in the beast so I wouldn't be surprised if I popped something loose. I just don't know how to test for leaks. And by the way my beast did fantastic.

2007 F350 6.0L FX4 Lariat CCLB
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post #2 of 7 Old 06-04-2013, 07:31 AM
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The lines are on your hubs. Rubber lines that push over a nipple. Mine leaks so I plugged them and now my air works perfect

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post #3 of 7 Old 06-04-2013, 07:34 AM Thread Starter
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Quote:
Originally Posted by Colin7.3 View Post
The lines are on your hubs. Rubber lines that push over a nipple. Mine leaks so I plugged them and now my air works perfect
So you just manually lock in when you need 4x4? That is what I ended up hafting to do all weekend. I would like everything to just work though.

2007 F350 6.0L FX4 Lariat CCLB
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post #4 of 7 Old 06-04-2013, 07:52 AM
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Exactly what. I do. I'm switching to full manuals soon anyway.

Start at the wheel side hoses and just follow up to the solenoid and pump. Look for cracks, cuts or just pulled apart lines

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Colin S. Age:22 Certified Diesel Tech, Infantry US ARMY
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post #5 of 7 Old 07-23-2013, 04:07 PM
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Where do I lug these lines off at? Got a pic? I thought I plugged it off where lines come from hubs still does it. Do I cap the pump itself or???? Thanks.

NAME: Justin


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post #6 of 7 Old 07-24-2013, 02:26 AM
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If you plugged the ends and it still runs you have nuther leak in the hose/hoses further up the line or a bad vac solenoid valve or hole in resivoir.


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post #7 of 7 Old 07-24-2013, 05:38 AM
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Any more detail on how the pump or solenoid works? I can vacume check resevoir and lines but not sure how to check the rest? Thanks!

NAME: Justin


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