C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

A/C Problem 96 LT1

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Old Nov 11, 2004 | 05:18 PM
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Default A/C Problem 96 LT1

The air from my a/c flows through the defrost and floor vents only. It will blow cold air, but, not through the a/c vents. Wondering what is causing this. I have read a few threads on some similar problems, but, did not see the fix. Thanks!
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Old Nov 11, 2004 | 06:24 PM
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The control unit isn't getting any vacuum, so find the source and trace it to a check valve that tees off to the cruise and then the vacuum tank. Usually the valve is shot.
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Old Nov 11, 2004 | 08:21 PM
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There is a little Vacuum check valve on the right side of the intake under the Fuel rail covers.Looks like a little barrel with three lines coming out of it.Check it out.and the rubber hoses...usually you Cruise control will fail too.It's a cheap part form autozone or whereever.....
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Old Nov 11, 2004 | 09:39 PM
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Found the check valve. Will get a replacement tomorrow. I have learned a lot on the forum. Thank You!
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Old Nov 12, 2004 | 08:14 AM
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Originally Posted by Shoregasm
There is a little Vacuum check valve on the right side of the intake under the Fuel rail covers.Looks like a little barrel with three lines coming out of it.Check it out.and the rubber hoses...usually you Cruise control will fail too.It's a cheap part form autozone or whereever.....
I agree. I have a 1996 and replaced that check valve.
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Old Nov 13, 2004 | 04:17 PM
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Just replaced the check valve and there was no change. The a/c still won't flow through the front vents in the dash. Any other ideas??
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Old Nov 13, 2004 | 05:12 PM
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on the 96 it is NOT that check valve. I too replaced that valve for NO reason. it's the box under the dash board.
there is a HUGH writeup on the corvette action center site. I have the same problem, but havn't felt like crawling under the dash yet.
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Old Nov 13, 2004 | 07:55 PM
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Thanks. Will see if I can find the write up. I appreciate it.
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