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jo - 01 Aug 2007 20:17 GMT

If you have no vacuum to the valve look for a leak in the system there is a
vsv (vacuum switching valve) behind the right side console kick panel. If
you have vac to the vsv then the valve may be bad if not, then check the
supply line from the vacuum source. Follow the vac lines from the motror to
the affected area. Before you spend any money on a cc push button unit.
Jo

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jb - 03 Aug 2007 20:34 GMT

OK, no vacuum at defrost valve. I do have vacuum at the column of switches
in center console behind climate control unit - 14 Hg on vacuum acording to
my vacuum pump guage. one vacuum line goes to switch 1 (the top), teh otehr
to switch 3.
I put a used cc unit on it recently, but defrost didn't switch before i
changed it either. Has never worked in the 10 years we have owned car.

1985 500sel AMG.

> If you have no vacuum to the valve look for a leak in the system there is a
> vsv (vacuum switching valve) behind the right side console kick panel. If
> you have vac to the vsv then the valve may be bad if not, then check the
> supply line from the vacuum source. Follow the vac lines from the motror to
> the affected area. Before you spend any money on a cc push button unit.
> Jo

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