New 300SD owner with a vacuum question - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 09-16-2012, 09:36 PM Thread Starter
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Vehicle: 1984 300SD
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New 300SD owner with a vacuum question

Hello all,

I just bought my first MB 5 days ago. It's a 1984 300SD. I know these things are heavily dependent on vacuum for various things to operate. Currently, the HVAC only blows out the defrost, door locks don't work, and the tranny shifts strangely.

I realize these are all vacuum-related, and I plan on doing the vacuum troubleshooting and repairing. I just wanted to get some advice from the knowledgeable members here regarding where to start. I've read that the vacuum pump check valve is a common failure, and that the vacuum pumps typically need rebuilding as well when system-wide vacuum issues occur.

What suggestions do you all have as for where to start? The cheapest I've found the vacuum pump check valve for is around $55, and the pump rebuild kit is around $125.

Any help is greatly appreciated. Thanks in advance.
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post #2 of 2 (permalink) Old 09-16-2012, 11:59 PM
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