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Old 03-23-2013, 01:58 PM
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IN2H2O IN2H2O is offline
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Join Date: Apr 2011
Location: Savannah, GA
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Vehicle: 2003 Dodge Ram 1500
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I would start by flushing the heater core first and then look to the blend doors.

I have owned numerous Dodges over the years and have had to flush the heater core on a couple of them. My 95 2500 V10 was the most notable since it had zero heat anywhere, (not fun at -45F). I flushed it in under 45 minutes and went from no heat to all the heat the V10 could put out. When I mentioned it at work the next day, I discovered 4 more guys with dodges that had the same problem. We all got together at my shop and flushed everyone of them and they all recovered 100%.

The Dodge's must have extra small ports that are easily blocked since all I have ever recovered was mostly rust flakes and the odd bit of silcone from original engine assembly.
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