Why Car Radiator Hose Collapse when Cold.

Why does the vehicle radiator hose collapse?. every time you take the car for a ride, after getting hot it may overheat due to air lock in the engine block cooling system. Once the engine gets cold, notice the upper radiator hose shrink or collapse. this will mean the radiator need coolant(not water). Water can damage engine with rust, always use factory recommend coolant. See in the video how to fix callapes radiator hose. This problem will most likely happen for all engine radiator cooling system.
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