Only defrost - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 24 (permalink) Old 05-21-2010, 04:11 AM Thread Starter
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Only defrost

So i threw my A/C on today and now only air is comming out of the defrost vents. What causes this? I have never heard of this nor had this happen so i am totally in the dark

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post #2 of 24 (permalink) Old 05-21-2010, 04:17 AM
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Re: Only defrost

Probably a broken vacuum line

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post #3 of 24 (permalink) Old 05-21-2010, 04:20 AM
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Re: Only defrost

there is a vacuum connector on the passenger side under the dash I have seen them unhooked before from a someone catching it with their shoe
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post #4 of 24 (permalink) Old 05-21-2010, 04:55 AM
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Re: Only defrost

Also a vacuum line that runs behind the dryer in the engine compartment that likes to break, crack, rub through. It is black in color. Easy fix if it is, is to cut away the bad section and put some rubber vacuum line on it.

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post #5 of 24 (permalink) Old 05-21-2010, 05:34 AM
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Re: Only defrost

get out ur hand held vacum pump and start checking lines, yellow, blue, red. The black one is ur main vacum, white goes to engine compartment cylinder to control atmosphere air.

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post #6 of 24 (permalink) Old 05-21-2010, 10:57 AM
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Re: Only defrost

blend door actuator
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post #7 of 24 (permalink) Old 05-21-2010, 07:10 PM
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Re: Only defrost

mine did that and i was a fuse. 28 or 29 i believe on my 2000 250
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post #8 of 24 (permalink) Old 05-23-2010, 02:22 AM
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Re: Only defrost

Quote:
Originally Posted by Eford00 View Post
there is a vacuum connector on the passenger side under the dash I have seen them unhooked before from a someone catching it with their shoe
Mine did the exact same thing.

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post #9 of 24 (permalink) Old 05-23-2010, 02:34 AM
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Re: Only defrost

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Originally Posted by kyle43335 View Post
blend door actuator
That's for hot and cold. You have a vacuum leak somewhere or the vacuum pump is not working.
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post #10 of 24 (permalink) Old 05-23-2010, 05:17 AM
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Re: Only defrost


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