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

C4 1995 AC vent control not working

Old 09-26-2016, 09:43 PM
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Sunny6
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Default C4 1995 AC vent control not working

So in transition from upper vent air to floor air its stuck on floor vent and will not exit the top vents. The AC is working yet can not manipulate air.
Old 09-27-2016, 01:21 AM
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Cliff Harris
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In about 99% of the cases like this, the vacuum check valve or related vacuum lines are bad. Look for it under the passenger side fuel rail cover (white and black plastic thingy):

Old 09-27-2016, 08:48 AM
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Sunny6
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Awesome thanks. Where do you get replacement part? How much??
Old 09-27-2016, 09:52 AM
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RUU
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Originally Posted by Sunny6
So in transition from upper vent air to floor air its stuck on floor vent and will not exit the top vents. The AC is working yet can not manipulate air.
Does the indicator light for the button pressed on the climate control light up when you press it? If not, then it is likely that the control panel button contacts need to be cleaned. If there was a problem with the vacuum check valve, then air would be coming out both the top (defogger) and floor vents.
Old 09-27-2016, 11:45 PM
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Originally Posted by Sunny6
Awesome thanks. Where do you get replacement part? How much??
Any auto parts store. About $4.
Old 09-28-2016, 01:39 PM
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Thanks team found issue with broken check valve part 3.99 at
Auto parts store

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