Mechanics

WHAT IS THE NORMAL DRIVING TEMPERATURE OF THE ? CITY? HIGHWAY? MY CAR IS RUNNING AT 190-200.

1977 Mercedes Benz 450sl • 142 miles

I drive approximately 80 miles each way to work. My temperature gauge is at 200 and sometimes get as high as 210. Before taking the car to a shop. What is the normal temperature for a 450SL?
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J L Perry
March 13, 2012.



210 degrees is not excessive. On some cars the electric radiator fan doesn't turn on until 220 degrees. The water in the coolant boils at 212, but when you use the radiator cap to put it under pressure, the boiling point is raised three degrees for every pound of pressure, so with a common 15 pound cap, the boiling point will be 257 degrees.

Caradiodoc
Mar 13, 2012.