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For my 2004 CLK-320 coupe, the owner manual mentioned that since the windshield washer is heated, there's no need to buy the washer with lower than 15C rating.

Now, does the car heat the windshield washer even the car is not started? Does this drain the battery?

I live in Toronto and frequently visit Montreal where temperature can reach down to -30C.
 

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the heater doesn't run when the car is off, so no, it won't drain your battery. the instructions assume the car is driven everyday, in which case there shouldn't be any problems with the fluid freezing. i am also in a cold climate and have never had a problem with the washer fluid.
 
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