Just to clarify for you guys... the SD is not connected to the engine/climate control vacuum at all... it runs off a pump in the trunk. the drivers door switch is electrical and controls the pump itself. if yours are locking, but not unlocking, you could have several issues. pump, tubing, actuators etc...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!