I have a vacuum problem with the AC in that there is air coming out the
defroster vent at same time as dash vents in the normal AC mode going up
hill ( decreased vacuum ) it gets worse. There is a yellow vacuum check
valve on the wall that is in front of the fuse box but slightly toward
the middle. It has one input and 2 outputs. Great vacuum coming in. Have
not checked the out vacuum as the lines seem to be fused to the plastic
valve. What is the chance that this valve could be defective as opposed
to a bad vacuum motor. If you disconnect the vacuum line then the air
all goes to the defroster vents and side dash vents (default position I
Well i bypassed the vacuum check valve and sent the vacuum directly to
the tube to the AC and it works fine except without the valve it does
not check on hills etc. So out to Mercedes to see if the valve that they
have is the right one. Only about 9.00 - surprise.
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