HVAC HELP
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 45
Likes: 8
HVAC HELP
My 1992 Formula has the vents stuck to the defrost. It blows out the defrost no matter what I have it set to. It did this a month ago and I moved some switches and it worked normally. Then this weekend I got in the car and turned on the AC lever was on Max and it started blowing out the defroster. Anyone have this happen and know the fix?
Supreme Member
Joined: Feb 2021
Posts: 1,209
Likes: 449
From: WA
Car: 1989 IROC-Z
Engine: L98 350 TPI
Transmission: 700R4
Axle/Gears: BW 9 Bolt / 2.77 Posi
Re: HVAC HELP
Check the vacuum lines in the engine bay for cracks / holes. You can buy new line by the foot at auto parts stores.
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: HVAC HELP
IIRC, defrost is the default when the HVAC selector is faulty. Check the following link for a fix:
https://www.thirdgen.org/forums/inte...anent-fix.html
JamesC
https://www.thirdgen.org/forums/inte...anent-fix.html
JamesC
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