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  #1  
Old 03-04-2001, 01:59 AM
David C Klasse's Avatar
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Location: Mission Hills in the City of San Diego
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I just tonight began to wonder if what I'm about to describe is out of the ordinary.
I unlocked my car via remote, doors unlocked, and the vacuum pump continued going for another good 5 seconds. The vacuum pump always stays on after the doors unlock/lock. I was beginning to wonder if this could be due to my vacuum leak in the unlocking air line (there are two, one unlocking/one locking in each door, correct?). My left rear door never unlocks like the others. It will hiss air and then a few seconds later will pop up, if at all. But it locks fine every time.
So what I'm asking.... Is my vacuum pump trying to equalize pressure or something from the leak in the line in the door? And if so, how should I solve this problem? I don't know how to get smoke into the system. Should I remove the door panel and possibly blow smoke at the area where it leaks to determine the exact location?
Thanks guys.
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 03-04-2001, 08:40 AM
MBenzNL's Avatar
MBenzNL
 
Join Date: Jan 2001
Location: the Netherlands
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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.

greetingz,
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  #3  
Old 03-04-2001, 07:58 PM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
MBenz,
I did that once before, but could not find the exact location of the leak... I could tell kind of where it was coming from, but not exactly. So I might try blowing smoke onto it? I hope that will help me out. I'll try it again sometime this week. And the vacuum pump should not sound after the doors lock/unlock, correct?

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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