Thread: A/C Vents closing and getting only defrost when I accelerate?
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Old 03-15-2005, 08:46 AM
Kestas Kestas is offline
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Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,855
Like Jim's post, this is a guess also, but I believe some designs use a check valve in the vacuum line that is supposed to maintain the vacuum to the HVAC system when vacuum disappears momentarily. If you find such a check valve, you should be able to suck air through it in one direction but not the other.
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