Quote:
Originally Posted by tangofox007
That is correct. If the master switch is in the lock position, whatever the reservoir has to offer (vacuum or pressure) is routed to the "unlock" side of the actuators. Pressure will have the opposite affect as vacuum, so the doors will unlock with a temperature increase. Lock your doors in the morning and you might come back to an unlocked car in the afternoon.
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This seems like a flaw in the security system. In a climate that has hot days and cool nights, a car that is left locked will eventually become unlocked as vacuum leaks out (air leaks in) and temperature cycles up and down, causing pressure to cycle up and down.
So a Benz sitting outside in a southern state in the US, of the the era that used a vacuum locking system, will most likely, eventually unlock itself.
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