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Old 02-01-2014, 11:55 AM
IN2H2O's Avatar
IN2H2O IN2H2O is offline
Dodge Ram Forum Senior Member
Join Date: Apr 2011
Location: Savannah, GA
Age: 42
Posts: 246
Gender: Male
Vehicle: 2003 Dodge Ram 1500
Trim Level: ST
Color: Red
Rep Power: 0
IN2H2O will become famous soon enough

In your case I would start by verifying that all your blend doors are connected and working properly.

It probably wouldn't hurt to backflush the heater core as well. It's not clear if the heater core was replaced before you bought the truck or after the engine was replaced but either way, it has small ports and is easily plugged by any debris in the system.

Overheating an engine loosens a ton of flake and debris from inside the block and would definitely cause this issue.
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