Date registered: Jun 2009
Vehicle: 1999 C280 210k miles
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My heater / AC blower worked intermittantly for about a year. Sometimes it was great, other times I had no air /heat for days. I used to bang the cover under the passenger side dash - the jolt would sometimes get the blower to rotate again. I'm guessing you have a similar problem and the jolt from the hood, doors, road, etc. get the blower to work for a few minutes at a time.
The problem can be in the blower motor or the resister pack. These are separate parts.
My problem was the blower motor. Bought replacement on Partsgeek for less than $200. Its an easy installation, search the forum for directions.
Been working great for the past 8 months.