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Old 03-04-2001, 07:40 AM
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MBenzNL MBenzNL is offline
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
There is only one line going in each door that will have an up going pressure (system blowing) to unlock the doors and will have a down going pressure (system sucking) to lock the doors.

If you hear a hissing sound in your rear door, there should be a leak. Remove the door panel and have a look (lock/unlock the car) and you will see/hear where the leak is. You do not need any smoke to find the leak.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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