HVAC air flap stuck open?

Kneale Brownson kneale at coslink.net
Wed May 31 14:44:52 EDT 2006

The flaps open and close through a vacuum "motor".   Its a flexible bulb
that expands and contracts to operate the doors.  I've seen a bulb break
free from its mounting so that it didn't have anything to push against to
operate the doors and I've seen one split, probably from age???

At 05:23 PM 5/31/2006 +0000, jalexmichaels at netzero.net wrote:
>Thanks for the operation description.  I will poke around the doors further 
>to see if it is a spring issue.
>Is there another fresh air intake somewhere in this system?  I am still 
>trying to solve the the strong fume smell problem, though it sounds like it 
>will help if I repair the fresh air door.
>My understanding is that the "outside" door is supposed to close during A/C
>operation so that you are not drawing warm outside air over the cold
>evaporator coils.  The "outside" door shares a hinge with the "inside"
>recirculation door into the cabin so that when one is open, the other is
>closed.  When the "outside" door closes for A/C operation, the
>recirculation door opens so that already cooled air in the cabin is drawn
>over the evaporator coils and can be cooled further.
>At 03:59 AM 5/31/2006 +0000, jalexmichaels at netzero.net wrote:
>>After looking over various q-list sources, I am confused as to the proper 
>>operation of the HVAC air intake doors.  The "upper" door under the hood and 
>>wipers appears to remain open no matter what function, including off, is 
>>set.  When is this door supposed to close?  Is it also supposed to have any 
>>sort of debris or particle filter?
>>I have started to look around the HVAC system more as there has been an 
>>increase in fume smells coming from the system.  Could this door issue be 
>>part of the problem?
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