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Originally Posted by tangofox007
The vacuum reservoir is always connected to either the lock or unlock vacuum circuit, as determined by the selector switch in the driver's door. If the reservoir is not holding vacuum with the doors unlocked, you must have a leak in the unlock circuit.
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Hmm, that seems to make sense, too. Would a leak in the unlock system create a 'venting' effect like was described above? If so then I guess a leak could cause the doors to lock when unlocked.
DieselAddict, the way you describe the doors slowly unlocking when the engine is running is what's supposed to happen provided the driver's door is unlocked at the time. On my car it's not slow, though, so that might suggest that you always had less vacuum, due to a leak or some other problem, in the system than you should have had.