I noticed my friends ml has white hard stuff stuck on the sides of his coolant reservoir! wierd.. i suggested to him to do a coolant change and to clean the container as well! but how do you do a coolant change on a ML? i'm guess its like every other car.. remove radiator drain plug, and add 50% water and 50% mercedes coolant into the reservoir with the heater temperature set at max? or do i have to remove the thermostat and remove the upper hose? thank you

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