Thanks for the response. Sounds like there are a bunch
of them in there. Are they mostly in the dash? Can you
tell me about where the pump is in the engine?
I'll poke around today/tomorrow and see if I can see
anything that might have come loose. Otherwise, I
guess I'll just have to have the dealer do it.
Thanks again!
--- Tubamirbls@aol.com wrote:
>
> Hi Phil
> The various baffles and diverters (Chrysler
> used to refer to them in
> their shop manuals as "blend air doors") within your
> HVAC unit are opened and
> closed by vacuum actuators. If you have a poor
> vacuum connection anywhere
> within the HVAC unit or in the supply from the
> engine some or all of these
> actuators will fail to respond correctly. Worst
> case scenario is when one or more of
> these baffles won't respond at all or sticks
> somewhere between full open and
> full closed.
> The reason why it responds even worse when you
> rev the engine, or if you
> were driving when you are accelerating is that under
> those conditions the
> engine produces the least amount of vacuum.
> Bottom line is that you either have a poor
> connection somewhere in the
> various lines supplying the HVAC or one actuator is
> failing and is about to
> quit altogether.
> I had a 94 Pontiac Grand Am which every time
> you went up a grade with
> the A/C on the vacuum supply became so weak that the
> setting of the various
> baffles to divert cold air started to change and my
> cold air became heater air.
> That was GM engineering. There was nothing "wrong"
> with the system.
>
> Paul Sahlin
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