The most common cause for radiator hose collapse is a vacuum issue caused by a faulty radiator cap. Another common problem is clogging of the smaller radiator runoff hose, which leads to the coolant tank. As the engine cools, if fluid cannot return to the tank, this will also cause a vacuum.Click to see full answer. Then, what happens when radiator hose collapses?When an engine is shut down, the coolant temperature begins to drop. If the vacuum valve in the radiator cap fails, the resulting vacuum in the cooling system can cause a radiator hose to collapse. A malfunctioning radiator cap can also constrict coolant flow. should I be able to squeeze my radiator hose? Perform a squeeze test. While the engine is warm after a drive, squeeze the radiator hoses, paying particular attention to areas where the hose bends. A radiator hose in good condition should feel firm, but not hard. A soft hose or a hose with a soft spot should be replaced. Additionally, how do I know if my radiator hose is collapsed? Collapsed radiator hose If you look under the hood and notice that the radiator hose has collapsed, then there is a problem. The hose can collapse because the hose is soft or has become to weak. In other cases a cooling system fault can cause the hose to collapse.Should both radiator hoses be hot?The bottom radiator hose should be cold, or maybe warm on very hot days. The thermostat controls how much of this cold coolant is brought into the engine from the radiator, via the lower radiator hose. If for some reason your upper radiator hose is cold, this would indicate you may have a problem.
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