I have noticed that when parked in my garage, my W209 CLK has a soft purr sound somewhere behind the dash. It can only be heard in a quiet location, eg garage. Apart from a cat being asleep in my car for a very long time, anyone know what it is? I assume it is an electric fan, but why and what for I am at a loss. It never shuts off.
I tried the MB Forum, but have not had much success with a result.

Regards Ingin