1999 Mercedes-Benz C280 Q&A

1999 Mercedes-Benz C280 Question: When I turn the heater on above 58 degrees it sounds like whale talk, know why?

Hi, I'm driving my first Mercedes ever and I'm trying to understand how to fix an annoying thing I noticed happens when i turn the heater on. When I turn the heater on above 58 degrees it sounds like whale talk, any idea why? This annoyance, and embarrasing, issue continues endlessly unless I turn it to "Low" or turn the "Window Defrost" instead. -
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