No air from vents with fan on

kneale at knitknacks.com kneale at knitknacks.com
Tue Aug 18 04:35:54 PDT 2009


Not familiar with the smaller cars, but in the HVAC system for sedans of
that era, the flaps in the heater core box that control where the air goes
are manipulated by an electronic controller mounted to the driver side of
the box.  On sedans, you need to remove the windshield wiper assembly to
get access to a bunch of screws holding a cover over the controller.

Original Message:
-----------------
From: J.B. Hebert jhebert at wrxtra.com
Date: Mon, 17 Aug 2009 22:50:27 -0400
To: quattro at audifans.com
Subject: No air from vents with fan on


Recently, I noticed that I was getting little or no air from any of the 
vents (dash, defrost, floor) on my '91 Coupe, even when the fan on 
high.  I checked the intake vent for blockage and pulled the fan out to 
inspect the heater core to see if something was plugging it, but 
everything is clear.  I also checked the function of the fresh air flap, 
and it seems fine.  The fan spins fine and there is no damage to the fan 
cage.  This problem seemed to have occurred suddenly, so I'm wondering 
if one of the diverters is stuck or blocked.  Has anyone run into a 
similar issue, and if so can you point me to some possible places to 
check before I pull the entire dash?  With temps in the high 90's 
lately, I'd really like some more air flow.

Thanks in advance.

J.B. Hebert
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