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Old 11-02-2000, 04:31 PM
Registered User
Join Date: Oct 2000
Location: Lansing, Michigan, USA
Posts: 49
I have several problems with my vaccum (I think).

1. None of the doors lock centrally. The trunk lock also will not maintain open position. I have to unlock it each time.

2. Engine does not shut off immediately.

I have repaired the one known crack in the vaccum lines, but don't know how to test which lines are good and which are not; nor do I even know if the vaccum works at all.

Any ideas, techniques on how to test the pump? The lines?

How about repair? Am I better just having all locks manual and forgetting central locking?


81 300D 250K+ (odo doesn't work!)
Want another one.
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Old 11-02-2000, 04:47 PM
Registered User
Join Date: Apr 2000
Posts: 166

This subject has been covered a number of times. Suggest you do a search on vacuum leaks in this forum. Posts have covered testing and repair.

Good luck. Hope it turns out to be an easy one.

1979 240D
160,000 miles
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Old 11-02-2000, 04:56 PM
Registered User
Join Date: Oct 2000
Location: Lansing, Michigan, USA
Posts: 49
Thanks. I will do that as well.

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Old 11-03-2000, 06:37 AM
Posts: n/a
Get yourself one of the cheap plastic hand vacuum pumps and start at the lines through the firewall next to the oil filter. By connecting the pump and pumping a vacuum, each circuit should hold the vacuum for awhile after pumping it. If the pump holds the same vacuum for 10 seconds or so, your problem is not in that circuit. I think the leak you are leaking for will be significant.

Good luck,

Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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Old 11-03-2000, 07:58 AM
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Join Date: Mar 2000
Location: Springfield, MO
Posts: 71
Where is a good place to get a cheap vac-pump for testing?

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Old 11-03-2000, 09:57 AM
Zoonhollis's Avatar
Diesel Fanatic
Join Date: Jun 2000
Location: Cary, NC
Posts: 551
I think AutoZone carries the MityVac pump and brake system bleeder.

Grey/black '84 300D, 197K
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