W116, Body and Interior Specific Aid

AC Part Time

1985 300DT For some reason the tach will quit working periodically, when it does the AC also only blows warm air. What is the connection and how can I repair it? You can stop, turn the ignition off and restart and everything will work correctly again...for a short time.

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valve orientation when installing manual climate kit

I have a question about the "Manual Climate Control Override" kit, specifically about installation of the valve included in the kit. The valve has an arrow on it, apparently indicating flow direction. But there was nothing in the MercedesSource instructions addressing valve orientation. Does it matter which way the coolant flows through the valve?

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Diesel "wobble" & groaning turning right

I have a 1984 300SD & it has developed a "groaning" sound when I turn right. I jacked it up & with the car running turned the wheel, no sound (most likely because it does not have the weight on it). I grabbed the tire I turned the tire hard manually & got a little noise from what I believe to be the "Guide Joint" on the top of the Steering knuckle. It looks to be in great shape. Any tips to solving or isolating the problem?

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Timing 75 300 D

1975 300D 1975 300D Cam shaft removed, injection pump removed. When cam shaft is re installed, Injection pump re-installed, Cam shaft mark lined up with TDC on Crank Shaft Pulley. Injection pump marks Lined for timing. Question: Is there any other timing marks that needs to be in line???? I read somewhere the the Injection Pump (DRive Gear) should be lined up with some yellow Dot on gear, which I can not find any dot on drive gear for injection pump. Sorry for the confusion in last question.

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