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Old 09-12-2007, 09:11 AM
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karburn karburn is offline
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Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 99
An answer

I received a pretty accurate diagnosis on another forum. There is a vacuum/pressure switch that is internal to the pump, and if it goes bad the pump will run until it is shut off by a limiter switch. If there was a vacuum leak that the pump was trying to compensate for, the door locks would not work right...and they do in this case.

The end result will be a trip to the dealer or a shop that I trust to either repair that pump or replace it. Maybe that's what the R stands for in R107 - repair / replace.
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Kevin Arburn
Overland Park, KS
1987 560SL
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