Mine works on max heat only. I turn the temp wheel down and loose heat but the fan is still trying to blow air. And it's cold in the California Sierras, burrr. Any Idea's?

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1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)