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

I agree with all of the replies so far, but would add reverse flushing the heater core with a HeCat or similar tool that pulses the fluid through the heater core. This is especially helpful on older systems with a lot of corrosion and possible sealer in the co... Login to read more.