Drawde,

I would also tend to suspect the pushbutton control unit. Mine went out last summer and the main symptom was intermittant cutting out of the fan for about 10 seconds and then everything would work fine for a while. I got a rebuilt one from my local independent mechanic. For the warranty to be valid, you have to test several parameters with a multimeter, to make sure that another electrical fault such as a malfunctioning aux. water pump isn't causing the pushbutton unit to go bad.

Also, since you asked for feedback about your posting, you will tend to get more replies if your subject line is more specific. For example, you might use a subject line like "Malfunctioning climate control in W123" or some such, since a lot of listers not interested in diesels would pass your post by, assuming your question to be specific to diesels. . . Just a thought. . .

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Steve
'93 400E