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Old 02-01-2014, 11:55 AM
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IN2H2O IN2H2O is offline
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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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