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Old 09-08-2007, 12:27   #1 (permalink)
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'00 F150 vacuum problem?

On my 2000 F-150 5.4 it just started doing something weird, when I go up this one long hill the AC stops blowing from the panel where I have it set and blows from the defrost vents. When I top the hill it switches back to the dash panel. I am assuming this is some kind of vacuum issue so I checked all the vacuum lines and can't find any loose or worn/cracked.

I don't think it could be related in any way but I just had a new battery installed (the original one lasted 7yrs and 8 mos, not bad!)
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Old 09-15-2007, 04:07   #2 (permalink)
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Re: '00 F150 vacuum problem?

bump
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Old 09-24-2007, 03:14   #3 (permalink)
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Re: '00 F150 vacuum problem?

nevermind guys. I found a forum where someone answered my question in about 15 minutes after posting. This one is at 2 weeks and counting. Try ford-trucks.com, it rocks.
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Old 09-24-2007, 06:21   #4 (permalink)
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Re: '00 F150 vacuum problem?

So why not post your solution here? It may help someone in the future.
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Old 10-04-2007, 18:20   #5 (permalink)
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Re: '00 F150 vacuum problem?

It is your vac res or lines...easy fix! visit your Ford house or auto store
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