TAT Express Inc. on Instagram: "Coolant keeps going low while you’re driving…but comes back when you shut the truck off?That is NOT normal coolant loss.On modern semi-trucks (Detroit, Cummins, Volvo, PACCAR), the air compressor is liquid-cooled. When the compressor head or casting fails, compressed air gets pushed into the cooling system and forces coolant out of the engine.It looks exactly like a head gasket — but it isn’t.This is how blown radiator caps, burst hoses, EGR cooler failures, and e

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