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  #1  
Old 07-19-2010, 04:11 PM
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A/C problems

Any one know what causes the a/c to blow out the deforsters? No matter where i set the dial defost only? Takin a 6 hour trip on sat and would really like the a/c working correctly any help would be great!
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Old 07-19-2010, 04:27 PM
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Originally Posted by Maxtorque View Post
Any one know what causes the a/c to blow out the deforsters? No matter where i set the dial defost only? Takin a 6 hour trip on sat and would really like the a/c working correctly any help would be great!
You need to check the vacuum lines that go to your auto hubs as well as the lines at the pump on the passenger side inner fender. You have a vacuum leak that is causing the problem.
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Old 07-19-2010, 04:30 PM
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Seems to be a lot of this going around. Just like he said, a vac leak. Better than an AC problem!
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Old 07-19-2010, 04:30 PM
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Originally Posted by dhanna6powerstroke View Post
You need to check the vacuum lines that go to your auto hubs as well as the lines at the pump on the passenger side inner fender. You have a vacuum leak that is causing the problem.
x2 i know the search sucks, but there were at least two other post with a brief repair/diagnostic procedure on here in the last two days that might help you out.
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Old 07-19-2010, 04:32 PM
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I found the thread that you need to read and the links. Good ones!

Please help! AC has a mind of its own.
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Old 07-19-2010, 04:42 PM
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Originally Posted by Hank View Post
I found the thread that you need to read and the links. Good ones!

Please help! AC has a mind of its own.
thats it. i never have much luck with the search function i always get 40 pages of unrealated stuff
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Old 07-19-2010, 04:44 PM
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I agree that Search sucks. I just subscribe to the threads that I am interested in then I can go back to User CP and find them pretty easily. Just my way.
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Old 07-19-2010, 04:56 PM
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mine does this like every now and then, but i walk around and unplug the connection on the inner fender passenger side, it seems to leak when it gets wet from the ac dripin on it
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Old 07-20-2010, 04:21 PM
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AThanks for all the help. It was the hub valve leakin. bypassed it workin great!!! Thanks to everyone this site is the best!
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Old 09-03-2010, 10:53 AM
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New hubs causing vacuum issues

Hello all,

I had to replace my hubs on my 2001 F 250 Super Duty 4X4 7.3 PSD. Everything was working as usual before the change. Now when I try to go into 4WD, AC goes to defrost. I have learned that signifies a vacuum problem. I took both hubs out of the system closed off the line on the drivers side and hooked up a vacuum guage to the passenger and everything worked normal again, got the 13 or so in Hg going into 4wd and the 5 in Hg to come out. No leaks from pump or lines. i hooked back up dr side hub and switched to 4wd and got mabye 5 or 6 in Hg and pump runs a long time. I am also not able to pull and hold a vacuum on the hubs themselves. Any input is greatly appreceiated.

Thanks,
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