I may have come in on the wrong time for this ac blower problem, but the other day I decided to clean the engine on my w210 and it went well not knowing that it would play a role in solving my problem with the airconditioning. Like most of you, I covered the important parts and started foaming the dirt and grime. After 10 mins, hosed it down and looked great.
Following day, went out with family and guess what, ac blower was working 100percent.
I don't know if its just me or what. I am happy.