My Mercedes-Benz S500 coupe seems to heat up when I am driving in the city, and tends to cool as I drive on the freeway. The temperature seems to run between 80 & 120 degrees celsius.
Any one have any suggestions on what I should do?
By the way, I drained my coolant container that was full of H2O (water) with a coolant that I purchased from a car mechanic.
Does it take time for the coolant to take affect?