Quote:
Originally Posted by Rversteeg
The air vent shutters are vacuum controlled. I am not sure if without vacuum they are spring loaded open or closed.
Do you have a manual system or ECC?
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Oh, ok. I searched a bit more and think I got it. It's a check valve, probably part number 9134341 and it is indeed a one way valve ins't it?
Can you know the proper installation direction just by the color white/black, or is there more to it?
I guess if it is installed the wrong way it might causing a vacuum leak!