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Q: why does my heater blows gold air rather then hot? on 1997 Mercedes-Benz E420

i turn on the heater and cold air blows out on the driver side but on the passenger side it blows a little warm. what might be the problem and where can i find it in the the car?
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Most likely low of water or the heater core is stopped up or check the thermostat to see if it opens too fast.I would change the thermostat 1st.
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