W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

82 300TD high operating temperature

kent

1982 turbo diesel wagon. great runner. no mechanical or fuel issues. always ran about 180 or so degrees. just barely above the 175 f mark on the gauge.

recently...maybe over a month or two. it is rising to near
200. (the next hashmark on the guage) or sligly above with in stop and go. and then drops to about about 185-190 at 60 mph. my usual cruising speed.

outside temps around 95 (though outside temp doesnt really have much of an effect...samre readings day or night)

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1978 450 SEL High Idle 2000 RPM

I have just acquired a 1978 450 SEL and based on the records the motor has about 35k miles on it since a complete rebuild. It starts up and runs fine (wants to die if you give it gas when cold) once warm. It drives great but the idle is high at about 2000 RPM cold and 1700-1800 warm. Not sure where to start.

Vacuum? Is there an idle control of some sort that could be bad?

I don't see an idle adjustment and don't know these gas engines so I'm lost.

Thanks for any help!

-Mark

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