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Old 02-04-2001, 11:56 AM
stevebfl stevebfl is offline
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Join Date: Mar 2000
Location: Gainesville FL
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The ability to lock and unlock only some number of times is only a factor on cars using the engine for vacuum and the engine is not running. The 126 chassis uses a vacuum pump and should lock and unlock till the battery runs dead.

The pump is designed to shut off after a certain pressure or vacuum is achieved each cycle. If the system has a leak and the pressures aren't achievable then the pump shuts off after some time period. I suspect something along this line to be your problem. To test locate the pump in the spare tire and watch what happens. Does the pump shut-off after similar intervals both locking and unlocking? If the time is long try removing the line and plugging it and see the time length.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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