S420 heater control not working - Mercedes Forum - Mercedes Benz Enthusiast Forums

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Old 09-13-2008, 06:13 PM
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Join Date: Sep 2008
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Default S420 heater control not working

Any ideas on why the temperature controls would not change the temperature of the air. No mater what degree setting it is on I only get cold air, this happens with both controls so it must be something not opening the water valve to the heater core?
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