Somewhere (here, I thought) recently I read a post regarding a tendency for
an air flow door to warp and therefore fail to direct air properly, but of
course now I cannot locate the post.
My system is the "automatic climate control" type.
Anyone know what can cause lack of adequate air flow and even the ability
to direct air thru different vents with MODE? (Weak-to-moderate flow comes
out all vents regardless of MODE selected, and the distribution is
unchanged with a different MODE selection.)
Air temp seems acceptably cool, and it sounds like the blower is pumping
enough air -- it's just not coming out the vents forcefully, so the AC
can't begin to keep up with this Colorado heat wave we're having!
Vacuum leak? Electronic control problem? Air flow door stuck or warped?
Anyone have similar symptoms and an idea where to start?
You start by removing all lower dash trim.
Then watch to see what moves or doesn't move when the MODE is changed.
Then see if some things (aka door actuators) that don't move, will move with a
The door actuators are usually two-way vacuum diaphragms with rods to the door
It should be obvious if one looks like it's trying to move but won't.
Another, step is unhooking the rods from the door leverss and seeing how the
actuators move then..
I have a Blazer that would not work properly with out removing one of the
return springs on a door. Door moves freely by hand, actuator moves fine when
not hooked up, but, won't work when assembled with spring in place.
Your situation sounds exactly like a particular TSB (I don't have the number
handy), and I think mine is a different problem. However, since it's so
easy, I just did the battery-disconnect thing. It does seem to have made
some difference in directing air flow with changes in the MODE setting.
I'll test it out further as the day heats up (sadly, that won't take long).
Thanks for responding, and good luck with yours.
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