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Do a search for "mono valve" here in the Diesel Discussion. You will find photos and everything. The mono valve is "open" (lets hot coolant flow into the heater) when there is no power to it. When the ACC sends 12 Volts to the mono valve, it closes. If the mono valve is stuck open, you get hot air and cold air mixing together, hence the situation you describe. This situation has been discussed many times here, pictures of fixing and all you need to know, just search.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
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"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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