The weather finally got cool enough to use my defroster on my 1980 300D. At 80C temp the defrost seems to blow warm on the passenger outlets and cool on the drivers side. Is there any obvious reason. The same happens when I switch to bi-level on the floor ducts.

thanks for any help,
jmdunn

Most likely the climate control servo isn't allowing enough water to flow thru the heater code.

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What does this mean? Do I need to think about a new servo? Is there any way to test it? Is it going to heat efficiently if I don't do something?

thanks,
jmdunn