Temperature Dial Diagnosis - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 12-05-2011, 06:53 PM Thread Starter
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Date registered: Dec 2011
Vehicle: 1982 Mercedes 380SL
Location: Northfield, MN
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Temperature Dial Diagnosis

Hi All,

I'm new to the list and I've already learned a ton of stuff from various posts. I have recently acquired a 1982 380SL (our first Mercedes). It's in very nice condition, with 75,000 miles on the odometer. I have a question about the heater temperature dial. When I start the car and have the heater on, dialed--let's say to 22-26--it works well and heats very efficiently. BUT, if I decide to adjust the dial down a bit, or change one of the settings, it stops pushing hot air and just pushes air. If I then turn off the car and start it again, it will again push hot air.

I'm figuring that this has something to do with a vacuum leak somewhere--turning off and restarting the car reestablishes vacuum, which was lost when I decided to re-adjust the controls. Is this an accurate diagnosis? Is this a difficult fix?

Any help is greatly appreciated!


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post #2 of 2 (permalink) Old 12-05-2011, 07:07 PM
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Date registered: May 2003
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Proceed to the R107 forum.

Felicita e un bicchiere di vino con un panino.
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