If these radiator hoses are not replaced on time, they continue to swell until they burst. Since both radiator hoses are designed to handle pressure between 13psi and 18psi, if that pressure exceeds these limits, the hoses will swell and eventually harden like a rock. As the almost boiling coolant passes through the upper and lower radiator hoses, their pressure will increase. When this happens, the coolant will start leaking until it reaches a boiling point. This erratic combustion will increase the engine’s heat and cause the head gasket to blow or break. Your engine will make rattling, knocking, and pinging sounds. Every time your vehicle’s engine overheats, it triggers multiple problems.įor instance, when your engine overheats, it will create hotspots within the combustion chamber, leading to spark knock and other erratic combustion. One of the main reasons your radiator hoses may be hard is that your engine is overheating. The following are some of the main factors that cause radiator hoses to get hard: Overheating However, many car owners rarely consider inspecting or replacing the radiator hoses.Īs a car owner, ensuring that the radiator hoses are in good condition will go a long way in preventing extensive damage to your engine and crucial components. When both radiator hoses are in good condition, they help coolant flow efficiently, thus protecting the engine. If this is the case, you need a professional mechanic to replace the radiator hose immediately. Sometimes you may find only a single soft spot instead of the entire upper radiator hose. If the engine gets hot after driving for a while, the upper radiator hose will be a bit hard but squeezable. However, if the radiator hose feels very hard, brittle, spongy, or soft, you need to replace it as soon as possible.Ī hard upper radiator hose indicates that cylinder pressure is entering your vehicle’s cooling system due to a blown or cracked head gasket. If the upper radiator feels firm and not hard, then it is in good condition. When your vehicle’s engine is still warm after a short drive, open the hood and squeeze the upper radiator hose, specifically where the hose bends. By performing a squeeze test, you can tell if your upper radiator hose is in good condition. When the upper radiator hose is in good working condition, it should be firm and not hard. Is the Upper Radiator Hose Supposed to Be Hard? Radiator hoses play an important role in your vehicle’s cooling system, where the upper radiator hose, particularly, is responsible for drawing hot coolant from the engine to the radiator.
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