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Old 09-13-2008, 05:13 PM
Join Date: Sep 2008
Posts: 1
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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Old 09-13-2008, 05:13 PM

benz, control, controler, heat, heater, mercedes, module, problems, pull, s420, valve, working

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