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Pointplacekids
User
Jul 28, 2011, 2:26 PM
Post #1 of 7
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Blowin air no where?
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 2002 gmc safari van 3.6 engine 125,000 miles.
At the begining of summer Inoticed my a/c quit blowin when I pressed on the gas hard (as when i was getting on the e-way ect...)
Now the vacum system for my a/c and heat vents has stoped diverting the COLD air (I so badly need). The blower motor works fine. Where should I look to find the problem? The truck runs very well. Thanks.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 28, 2011, 3:28 PM
Post #2 of 7
(2006 views)
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Re: Blowin air no where?
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The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 28, 2011, 8:15 PM
Post #3 of 7
(1995 views)
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Re: Blowin air no where?
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Yes/No - HT - this should be all electric actuators. No vacuum involvement,
Tom
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Pointplacekids
User
Jul 30, 2011, 3:26 PM
Post #5 of 7
(1962 views)
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Re: Blowin air no where?
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Just as you said , oh wondrous one of knowledge. I found a vacuum hose partly burt/ melted , replaced it and we have COLD air again!! Thanks you made my weekend !
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 30, 2011, 3:34 PM
Post #6 of 7
(1960 views)
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Re: Blowin air no where?
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You're welcome. That's why we all volunteer here.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 31, 2011, 6:32 AM
Post #7 of 7
(1949 views)
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Re: Blowin air no where?
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So glad it's fixed and that was a common problem, Credit to HT as he knew it was still being done by vacuum which I thought ended with the stone wheel.
Site is free and will be if I have an influence and do thank publicly or privately someone who steered you right and hope just did. Thanks HT,
Tom
(This post was edited by Tom Greenleaf on Jul 31, 2011, 6:34 AM)
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