What is the vacuum part under the back seat in a 1987 300d. Is it the vacuum supply pump (very expensive) or is it the vacuum amplifier (much less costly).

While searching for the reason why my door locks don't work (they never did) I looked under the back seat and the bpart was missing!!!

I went to the local u-pick there were no 124 cars to compare so I'm not sure what the part looks like.

Any help appreciated.

Joe.

__________________
www.jerseyplanning.com
1987 300TD 440K - My car
2005 Jeep Grand Cherokee Laredo 107K - Tim's car
2000 - CLK320 100K - Deb's car
1994 C230 150K - Josh's Car

That would be the vacuum pump for the door locks and the other luxury equiptment.

Joe,

I have not lifted the seat on my 300E, so I cannot say for sure, but on my 190E 2.3-16 the vacuum pump is an electrically powered unit, sits in a block of grey foam rubber, and has vacuum lines and power lines coming to it. It is on the passenger side of the car.

If this is missing you have a good explanation for why the system does not work. Check Fastlane as well as recycling places. Or E-Bay. Good luck, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

I replaced this part myself a few months ago when my locks stopped working. I believe it was less than $100 used. It is for the door locks. Make sure there are no other leaks in the doors when you replace it or you will very quickly burn out the new pump.

__________________
1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction

THANKS FOR THE RESPONSES !!!

I figured that it was the pump but wasn't sure. I went to a local recycler and he would have sold me one from a 1981 SD for $25.00 but Mercedes said that it wasn't compatable. The yard had a couple of 280CE's a couple of 300D's (earlier models) and a couple of S class cars. I'll have to keep Looking.

I assume that this system is separate from the engine vacuum system and that a leak here won't affect the transmission shifting etc.?

Thanks again,

Joe

__________________
www.jerseyplanning.com
1987 300TD 440K - My car
2005 Jeep Grand Cherokee Laredo 107K - Tim's car
2000 - CLK320 100K - Deb's car
1994 C230 150K - Josh's Car

That's correct--it won't affect tranny.

You need to get the pump from a 201 or 124 model (190 or 300E/D) since the earlier models mostly depended on the engine vacuum pump to supply the vacuum.