HVAC Control Problems
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Junior Member
Joined: Apr 2003
Posts: 46
Likes: 0
From: Colorado
Car: 2001 VW Passat
Engine: 1.8 Turbo
Transmission: Automatic 5 speed with Tiptronic
Axle/Gears: Stock
HVAC Control Problems
On my 83 Camaro whenever i try to turn the heater on there is a hissing sound coming from the HVAC control panel and the air is directed out of the defroster vents. That drives me crazy and eventually it comes out of the floor. That hissing sound occurs on every position but MAX AC. Otherwise it hisses and blows out the defroster vents until it decideds to switch to the correct outlet. Whats going on here? How can I fix this, please help ASAP! cory
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
The problem is common to thirdgen cars. If you'll do a seach, you find considerable info. Kansas?
JamesC
JamesC
There is a little wheel on the vaccuum selector that is probably loose. That is leaking out the vaccuum (the hissing you hear), and since the actuator doors can't get the vaccuum they need to open and close, only the default setting will work, which is defrost.
The easiest way to fix it is to just replace the heater controls.
Good luck,
Matt
The easiest way to fix it is to just replace the heater controls.
Good luck,
Matt
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