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

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Old Sep 26, 2010 | 09:59 AM
  #1  
J Fleming's Avatar
J Fleming
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From: Petersburg Virginia
Default Air conditioning

Ok I hope there is someone out there that can help me. My air conditioner in my 90 Coupe wont blow out of dash vents only the defroster vent and under dash vent any ideas where to start troubleshooting? I just put my Targa top back on for the season and we are still getting days in the low 90's.
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Old Sep 26, 2010 | 03:58 PM
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check the vac.I believe there is a tree on the engine. Does the cruise work?
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Old Sep 26, 2010 | 09:26 PM
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vetteoz
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Originally Posted by J Fleming
only the defroster vent and under dash vent any ideas where to start troubleshooting?
Check vac line to rear of plenum. Has a one way valve by dist that splits vac to plastic line inside main harness and to cruise control.Valve commonly gets brittle and cracks



If vac lines good , may be programmer problem

http://www.batee.com/corvette/acrepa...oard/index.htm
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Old Sep 26, 2010 | 11:40 PM
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There is a black plastic hose that comes out of the wire bundle behind the passenger head. Sometimes the hose will break and you may have to do a little digging to find it.
Look at the pic from J Flemming. Where the rubber 90 is on the check valve is where the black plastic hose goes.
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Old Sep 30, 2010 | 09:14 AM
  #5  
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J Fleming
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Thanks Guys I will check these this weekend if this monsoon season we are having here ends.
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Old Oct 28, 2010 | 10:01 PM
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Had the same problem w/my 93 and it ended up being the C68 HVAC programmer. Replaced it and it fixed the problem. Probably will have to find a used one.
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