The a/c-heat blower does not turn on for several minutes after I start the car. Once it works, it works perfectly.
Does it sound like a regulator or blower motor problem?
Give the prices of these components I want to avoid trial and error.
I know about using the W140 regulator to avoid having to upgrade the whole system.

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)