Normally I would agree BUT the fact that I am getting good vacuum on the heater valve and the line tells me that the problem is not the monovalve having a rip in it. If that were the case I would not be able to get a vacuum the way I understand it. Also, is there a monovalve between the heater valve and the vacuum distribution module or does the vacuum line from the heater valve go directly to the vacuum distribution module?

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners