AC Vent won't switch

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Aug 5, 2011 | 05:10 PM

iceman383ja

Thread Starter

Junior Member

Joined: Dec 2006

Posts: 10

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From: Augusta, Ga

Car: 91 Z28, 2014 ZL1

Engine: 383, LSA

Transmission: WC T-5, T6060

Axle/Gears: 3.73 in both

AC Vent won't switch

I'm trying to figure out what controls the movement of air from the defrost part of the dash the vents...any help would be great. I have already started checking all of the connections behind the control unit and everything still looks to be good shape.

Aug 5, 2011 | 05:49 PM

JamesC

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iTrader: (5)

Joined: Aug 1999

Posts: 19,282

Likes: 103

From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: AC Vent won't switch

Quote:

Originally Posted by iceman383ja

When there's a vac leak, the default setting is defrost.

JamesC

Aug 5, 2011 | 06:43 PM

iceman383ja

Thread Starter

Junior Member

Joined: Dec 2006

Posts: 10

Likes: 0

From: Augusta, Ga

Car: 91 Z28, 2014 ZL1

Engine: 383, LSA

Transmission: WC T-5, T6060

Axle/Gears: 3.73 in both

Re: AC Vent won't switch

Thanks bro, I started testing all of the vac's behind the control unit and manually turned on different portions. Not sure what is bad at the moment....thinking it may be the control unit. I think the leak maybe from the vac line in the engine bay to the control unit now....It won't hold any pressure

Aug 5, 2011 | 06:52 PM

JamesC

Moderator

iTrader: (5)

Joined: Aug 1999

Posts: 19,282

Likes: 103

From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: AC Vent won't switch

Quote:

Originally Posted by iceman383ja

....thinking it may be the control unit. I think the leak maybe from the vac line in the engine bay to the control unit now....It won't hold any pressure

You might stick your ear to the HAVC and listen. If you hear a leak, your problem probably6 lies with the following part: Valve Vac Sel GM part # 16032395.

JamesC