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Heater blowing cold.
Hey guys I could use some help with my 2003 Denali with a 6.0 Had no heat and the engine wasn't getting up to operating temp. Replaced thermostat and flushed Rad and Heater core and lines. The heat still blows cold in front, and luke warm in back. Any tips on what else could cause the heat to...- Kram313
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- Forum: Engine & Drivetrain
