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when I turn the heater in my car it only blows cold air
Here are some possible answers: http://repairpal.com/i-have-no-heat-what-could-be-wrong
It may sound crazy but what how are you turning the heater on? You'll have to press the AC Off button.
Common Problems > Mercedes-Benz E320
Q&A > Mercedes-Benz > 1999 Mercedes-Benz E320
Q&A > Mercedes-Benz > 2003 Mercedes-Benz E320