HVAC system output goes to defrost and floor upon acceleration

Ed Kellock ekellock at gmail.com
Wed Jul 11 15:47:43 EDT 2007

I've seen it many times before but I've forgotten the cause and can't
seem to find it in the archives.

When I open the throttle to accelerate or hold speed going up a hill,
the blower output goes to the floor and the windshield.  This is
happening on both my Avant and my 93 V8.

Is this as simple as a vacuum leak somewhere?

On the Avant, I checked the black supply line from the engine and it
is still connected in the engine compartment and in the plenum are at
the base of the windshield.

What else should I look for?


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