By high speed do you mean the car or the blower. Anyway the car was in low speed as there was too much traffic. Also the a/c blower was in low speed as the a/c does not really cool well in auto or high speed. only get a lot of air but not really very cool.
Now to add to all the trouble my battery is completely discharged.I foolishly left my cabin overhead backlight on and now the battery is dead.Tried to get it recharged but it does not charge at all. Getting a new battery and also asked my mechanic to check the fan and the monovalve too.
Anything else i need to check.

Thanks in advance.

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300CE 1989 Euro Model.
ML350 2011.