Ref post 161 mystery servo.
Quote:
Originally Posted by vwnate1
This one is the hot water bypass , it doesn't seem to open unless the default mode is used .
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I don't think that's correct. There's a single page in some FSM documents that show the "Vacuum element on vent line (on vehicles with diesel engine only)".
That's part # 85 in the attached pdf. It comes off a white line, is outside the firewall, then continues on to the center pod line.
My bet on the lack of vacuum on the center pod line is a hole in the OUTER diaphragm on pod 42 - the defrost pod. If the outer diaphragm is torn, the center pod will dump vacuum through that hole. But if the inner diaphragm is intact, then the defrost vents will still move and it will still "hold vacuum" but only in one chamber.
This is the only place I've seen the depiction of the vacuum element outside the firewall. But it fits the description in post 160.