defroster/heater controls
Thread Starter
Junior Member
Joined: May 2005
Posts: 24
Likes: 0
From: Kansas
Car: 1986 trans am
Engine: 350 carburated
Transmission: 700 r4
defroster/heater controls
Only my defroster works, move the selector and still only defroser
is this electrical or avacuum problem ?
is this electrical or avacuum problem ?
Supreme Member
iTrader: (3)
Joined: Jul 2004
Posts: 2,989
Likes: 9
Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Vacuum. All the deflector doors are operated by vacuum solenoids. If you find out you need some, let me know, I got three or four for sale.
Lou
Lou
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
This is a common thirdgen problem. In my case, the selector itself was leaking. Stick your ear to the HVAC controls. If you can hear a hiss, you've probably located your problem. If not, a search will help.
Where in Kansas?
JamesC
Where in Kansas?
JamesC
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
I'm 13 miles from the Nebraska line. Lived in Wichita for several years while attending WSU--long ago and far away.
JamesC
JamesC
Supreme Member
Joined: Aug 2005
Posts: 3,004
Likes: 4
From: Yellowknife, NWT, Canada
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43
If the hvac looses vacume for any reason it will default to defrost for safety reasons.
If you dont hear any hissing in the console start fishing for the line that runs to the engine.
If you dont hear any hissing in the console start fishing for the line that runs to the engine.
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