Hello, new to site.

Have a 1999 s320 and vacum pump under rear sear has failed. It had been working intermittently for the longest time now it does not turn on. interesting also the fuse in trunk seems for it and the trunk light is constantly blowing out. Even when i replace fuse pump does not work. Maybe shorted inside? Price for this pump is about $800.00. Anyone have any ideas on how to repair? Is there a reputable remanufacturer?

Car is worth about 10k. Does not make sense to spend $1000. for pump to lock doors. All suggestions appreciated.

You can find them at the various online sellers for less than $500, maybe cheaper on eBay. ProgRama may sell rebuilt units. The change-out is simple and there are several posts on how to do it.

If the fuse is blowing, there is a good chance that the pump motor is fried. That's what happened to mine, and I fixed it with a motor from a used pump unit that I bought for $25 from a local shop. The units often get replaced because of the valves or the control module, so the trick is to find one with a good motor.

So ask around and maybe you can find someone to sell you one.

Replacing the motor is fairly easy.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

$1000 is much cheaper than the cost to replace a vehicle.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

Does that car use the same lock pump as the W126? If so I have one I would sell....give me the part number or a pic etc, and I can tell you if the one I have would work.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)