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Q: Heater failure on 2003 Mercedes-Benz E320

what could cause the heater not to work in a 2003 mercedes benz 320E
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Many things can cause a heater failure, it is best to do an inspection of the Climate Control System in the vehicle. There is a computer that controls this system and it will have codes to help solve the mystery.

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if the fan doesnt blow it probably needs a new blower and regulator. if it blows cold it probably needs a heater control valve near the windshield wiper motor.
Make sure the coolant system is working properly and the trans oil is not mixing with the freeon.
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