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International Automotive Technicians Network
Re: Truck won't warm up
Posted to Technical Discussion Forum on 3/22/2023

Hi James,

Disconnect the heater hoses and use a garden hose to blast out the sediment in the heater core. After that use shop air in short bursts to blow through the core. Repeat until you get decent flow using the garden hose.

Once in a while I will even ... Login to read more.