I checked alldatadiy.com and found no TBS for your problem. My best guess is that you have a bad "blower regulator" which supplies the power to the blower depending on the blower stage set. It is located on the blower motor which is located under the grove department. Reading about had the heating and A/C works I found out that the SLK has an electric water pump for the heating system, just something else that can break.
As I stated it is under the grove department. However I remember that another member of this forum recently replaced the heating A/C motor, so maybe he will see this post and help you out.
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