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Discussion Starter · #1 ·
Car is in storage and I'm not inclined to start it but I have an HVAC question.

The recirculation door is vacuum acurated. However I'd like to know if it needs constant vacuum to stay in recirc.

Does the engine need to be running for the blend door to stay in the recirculation position?

Thanks
 

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According to the SRT4 FSM

"Vehicles equipped with A/C have a vacuum operated
recirculation door actuator. When vacuum is
supplied by the A/C-heater control to the recirculation
door actuator, the recirculation door moves to
the RECIRC position. The actuator is spring loaded
so the door moves to the Outside-air position when
there is no vacuum supplied."
 

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Yep, it's been that way for a long time. It can be aggravating, on the late 80's early 90's cars, as they got to about 10 years old, the plastic was so bad, and that included those hoses. When they'd break, to fix things, you had to nearly completely tear apart the dash to get to all of the hoses. I distinctly remember one we fixed, got everything back together, and the horn and blinkers no longer worked. Ended up having to tear apart the dash on ANOTHER car just to see what I was missing, and it was a tiny clip that slipped around the nut in order to allow the nut to act as a ground.

It's crazy how frustrating some of that stuff was, but looking back, that was time well spent with my father.
 
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