Cold Air Coming from Passenger Footwell
knotnook at traverse.com
Tue Mar 12 06:44:15 EST 2002
There's a flap in the firewall behind the glovebox that is used when the
A/C is engaged to take cooled air from the cabin through the air intake
system so the A/C isn't always cooling new outside air. The Audi approach
is to hold the flap closed with a spring when A/C is not turned on and hold
it open with a vacuum motor when A/C is on. If the spring or its plastic
mount break, the door hangs open and you get fresh air from outside
migrating into the passenger footwell. You also get a very sudden thorough
fogging of the windows in cold, moist atmospheric conditions that worsens
when you turn on the defrosters because the system then is mixing warm air
from the cabin with the cold air from outside.
To check for the broken spring/mount circumstance, you put your head in the
passenger footwell and look up past the back of the glovebox with a
flashlight. The repair procedures (either broken spring or failed plastic
mount) are described well in the archives. Do a Google search on the
Audifans.com website for window fogging.
At 02:07 AM 03/12/2002 +0000, Jobe Tichy wrote:
>I am a newly acclamated 200tq 20v owner, so I am still getting used to the
>climate control operation. I have a quick question regarding what appears
>to be cold (possibly fresh outside air) coming from the footwell of the
>passenger side of the car. Even when I had it on HI heat, cold air would
>come out (possibly blended to a luke warm). Is this normal? Even with
>Defrost on, I would still feel air on the feet. It is not too big of a deal.
> But highway speeds in this COLD weather, it gets a little bothersome.
>Would there be any fuse to look for that may be blown and preventing a vent
>door from closing? Thanks in advance.
>'91 200tq 20v
>'84 BMW 318i (modified)
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>200q20v at audifans.com
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