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No heat above certain speeds on 82 300D
Ok. Here's the deal. On the 1982 300D, the heat works great at low speeds. It gets real warm and toasty inside. But today, I noticed at highway speeds, more specifically, about 70 mph, the air starts cooling through the vents. I had the thermostat control all the way to MAX, but it just blew cool air, but when I kept the speed below 55, it was nice and hot again. Am I dealing with a torn monovalve diaphragm or something else?
-Joe
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate
Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.
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01-17-2005, 11:56 PM
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