my '99 silverado does this even when the heat is on. it goes away when you
set the controls to recirculate cabin air.. I figured it was just a vent
that was open, or something that was leaking air from the vent.. *shrug*
I should have mentioned that I have the automatic climate control. With the
automatic, the recirculate button will not function when using any of the
defog settings. So you either drive blind and warm or be cold and see.
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