HVAC problem-Damper stuck in defrost path
Thread Starter
Instructor
Joined: May 2003
Posts: 162
Likes: 0
From: fort mill sc
HVAC problem-Damper stuck in defrost path
My '95 C4 directs the A/C flow to the front windshield defrost duct. The control buttons do not change the flow path to the floor (mixed) or dash vents. The fan switch works fine and the A/C cools, heater heats. It just send most air to the windshield.
Where do I start?
Where do I start?
Burning Brakes
Joined: Aug 2002
Posts: 926
Likes: 2
From: chandler az
It is on top of the engine - under the plastic fuel rail cover on the drivers side . take a look at this link.
someone else's pictures
someone else's pictures
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
Wasn't before, but broken now!
Originally Posted by brookman
There is probably a broken vacuum tee under the drivers side cover on the motor.
. The plastic tube on the snout end of the valve is thin, and no doubt brittle w/ age/heat, but it broke so easily, I have to think it may have been cracked already.Well, since it broke off about 1/8" inside the rubber junction splice, I RTV'ed the connection until I can get the "thingy" replaced
. Point being, be careful!!P.
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
I have just fixed the same problem, but on my 88 so may not be the same as yours - what happened was a fitting broke off the spindle that turns the door to the w'screen air vent.
Can you take off the top of the dash ? if so, you can see if the vacuum motor is working and whether the part is broken - it was a tricky fix, I have some pics but not posted anywhere yet.
S'nut
Can you take off the top of the dash ? if so, you can see if the vacuum motor is working and whether the part is broken - it was a tricky fix, I have some pics but not posted anywhere yet.
S'nut
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Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Very easy on the 88 - only 4 screws holding mine, 2 in the central w'screen vent and 2 underneath, also central - but I'm sorry, I don't know about the later models like yours, perhaps someone else can advise, or check your workshop manual.
S'nut
S'nut
1st Gear
Joined: Jun 2021
Posts: 1
Likes: 0
I have just fixed the same problem, but on my 88 so may not be the same as yours - what happened was a fitting broke off the spindle that turns the door to the w'screen air vent.
Can you take off the top of the dash ? if so, you can see if the vacuum motor is working and whether the part is broken - it was a tricky fix, I have some pics but not posted anywhere yet.
S'nut
Can you take off the top of the dash ? if so, you can see if the vacuum motor is working and whether the part is broken - it was a tricky fix, I have some pics but not posted anywhere yet.
S'nut
Thanks,
Jeremy
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Sorry Jeremy I don't know where those photos are now or if I still have them. From memory, I removed the top of the dash and looked inside and could see that the motor and arm were moving but the spindle attached wasn't. A spot weld or something had broken. I had the spindle brazed back onto the arm and it's worked ever since. Of course your problem may be different. HTH
