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Old March 2nd, 2011, 06:49 AM   #3
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Join Date: 03-19-06
Location: petersburg, MI
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Could it be a plugged drain tube on your heater box? That would allow funky water to build up in there. Does that truck have a cabin air filter? If it does that should be changed also because it can seriously block airflow in there. Are you losing antifreeze?
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