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Old 12-19-2003, 11:18 AM
Tod Labrie
Posts: n/a
Intermittent Heater Issues

RE: a 1985 300TDT. As of recently, The heat only works 50% of the time. When it does not work, there is no fan/blowing activity, and no heat coming out of the vents, even at highway speeds. The rest of the time it works fine. I replaced the mono-valve (using the MB supplied repair kit) with no luck (although that could be defective). There is no fan belt on the A/C compressor though. The A/C hasn't worked in years. Only the p/s and alternator belts have been changed. I doubt that has anything to do with it but...

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Old 12-19-2003, 11:32 AM
pesuazo's Avatar
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Join Date: Oct 2002
Location: Near Raleigh, NC
Posts: 580
Next time it happens, press the button for high fan speed and wiggle the key (lightly) in the ignition.
See if the fan runs.

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