I will point out that on the pre-84 W126's this would be impossible, because the drivers lock is the only one that operates the locking system, and as such, it has no vacuum connection of its own. So if the pump went crazy only the other doors would lock, the drivers door would remain open. So my car is immune to this issue.

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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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