###### Asked in Mercedes-Benz, Car Heaters, Gorillas, Air Pollution

Mercedes-Benz

Car Heaters

Gorillas

Air Pollution

# The heater stops putting out hot air when the engine temperature reaches around 80 degrees celsius on your 1981 Mercedes Benz 300SD and you would like to know what the problem might be?

242526

## Answer

###### Wiki User

###### 06/14/2007

Check the duo-valve first, then the heater register

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###### Asked in Science, Physics, Chemistry, Temperature

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###### Asked in Calculus

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