Questions and Answers

Leaky head gaskey on 300TD

The head gasket on my 300TD wagon is leaking and my mechanic said you can drive years with this condition. Being a major investment, how important is this to get done? Is there a reasonable chance of serious damage if it's not fixed soon? The mileage hasn't been so good since we got it, don't know if this repair would help that. I think I'm going to replace to injector tips soon to see if that helps mileage a bit. Thanks for any feedback.

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Heater and Tach problem for a 1982 300 CD TD

I found no repair Manuals and/or Diagnostic Guides to diagnose my AC/Heater and Tach problem. My heater does not come on when I want it to come on. Most of the time, nothing. I would press the buttons on the climate control and hear contacts, I would roll the temp setting wheel and hear contacts in AC as well in heating. I have source parts and like to repair it myself. I am willing to do a rebuilt, if possible. The Tach either jump around or does not work or works normally, mostly jumps around. This bothers me

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Tranny Vacuum Dashpot Location for 1980 300D

I am a reletively new owner of a 1980 300D, and learning as I go. I've recently been trouble shooting the lack of heat, which means the vacuum system. I've got heat back, but the tranny feels like it is slipping as it shifts gears. I purchased a transmission daspot, but the car doesn't have one currently installed. Should my 1980 300D have a dashpot? If so, where should it be installed? Your help is appreciated.

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Recoding a Becker Grand Prix?????

Hi All, I was working on a Heater motor problem and made the tragic mistake of unpluging the radio while attempting to pull the ACC unit. My MB Tech. Companion said my particular radio was equiped with an anti- theft device that scrambles the radio when unsuspecting dolts like myself disconect them. Has anybody got any advise as to how to restore the settings? Thanks Mike Waine

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Wiper Speeds at Combination Switch are backwards

Re: '82 300SD (new car for me). The first wiper position on the combo switch gives fast wiper speed, the second normal speed, and the third does nothing at all. I think the proper order is intermittent, then normal, then fast. Everything else on combo switch works fine. Should I get a new switch? How to I remove it to troubleshoot and/or replace? Need instructions. Thanks!

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Brrrr! 82 300SD Heater Motor goes kaput!

Hey gang! Thanks to Kaia and Mercedessource, we completed our journey from Boulder, CO back to Portland, ME in our just-puchased-that-evening 1982 300SD. We made the trip back to Maine in 34 hours flat, averaging 25 mpg. Thanks to your book(s), we diagnosed a clogged ALDA line heading from the intake to the sensor and wala, bugs no longer hit our back windshield as we crossed Iowa. The only thing, and only thing that really gave us trouble on the trip was, 3/4 way back, the heater motor just QUIT. The gentleman we bought the car from stated that he had replaced the 'control valves' - which I read as he replaced the push button array in the center console (which was confirmed by finding it half-bolted in).

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84 300D euro runs at high rpms on highway

I'm sure this has been addressed in the past but I didnt see it. I recently purchased an 84 300D Euro. I noticed right away that when I get up to highway speeds (70 mph) it seems to run at very high rpm. I checked that it is shifting through all the gears so it seems to be a rear end problem??? Is this something I can do by myself and what can I expect to pay for one? Any advice is much appreciated.

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