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Swollen radiator hoses are one of the common automotive problems. If the radiator hose is swollen, it can lead to overheating or damage to the engine, or even serious consequences.

Why do radiator hoses swell?

1.1 High temperature and pressure
One of the most common causes is high temperature and pressure in the cooling system. When the engine is working, the temperature rises dramatically while coolant is pumped into the cooling system, creating considerable pressure. In this case, the radiator hoses may expand as a result of the excessive pressure.

1.2 Hose Aging
Over time, radiator hoses are subjected to high temperatures and coolant and deteriorate. Aging hoses lose some of their elasticity and tend to become brittle at high temperatures and pressures, which can lead to expansion.

1.3 Cooling system problems
Other malfunctions in the cooling system, such as water pump failure and clogged radiators, may also cause the coolant to not flow well, increasing the pressure in the system, which affects the proper functioning of the radiator hoses.

1.4 Chemical Corrosion
Radiator hoses may be corroded by chemicals, such as corrosive substances in the engine coolant. Chemical corrosion can lead to rubber deformation and swelling.

Symptoms of Radiator Hose Swelling

Symptoms of a swollen radiator hose include:
The diameter of the radiator hose becomes significantly larger.
A bulge or crack appears on the surface of the radiator hose.
The radiator hose develops a leak.

Dangers of a swollen radiator hose

3.1 Engine overheating
Swelling of the radiator hose may result in ineffective circulation of coolant, which may cause the engine to overheat. An overheated engine may damage critical components such as cylinder heads and cylinder walls, and in severe cases, may even cause the engine to be scrapped.

3.2 Cooling System Failure
Expanded radiator hoses may eventually cause the entire cooling system to fail, affecting the normal operation of the car. This will increase repair costs for the car owner and may cause other related problems.

Repair of Swollen Radiator Hoses

If you notice a swollen radiator hose, you should have it repaired as soon as possible. Repairs for a swollen radiator hose include:
4.1 Replacing the radiator hose: If the radiator hose is badly swollen, it should be replaced with a new radiator hose.
4.2 Repairing the radiator hose: If the radiator hose is not badly swollen, you can try to repair it. Methods of repairing the radiator hose include gluing it or heating it with a heat fusion gun.

How to Prevent Radiator Hose Swelling

To prevent a swollen radiator hose, you can take the following steps:
5.1 Regularly check the radiator hose: check the radiator hose regularly and repair any problems you find.
5.2 Use high-quality radiator hoses: using high-quality radiator hoses can prolong the service life.
5.3 Avoid using poor quality coolant: poor quality coolant may corrode the radiator hoses.


If you find a swollen radiator hose, it should be repaired as soon as possible. To prevent swollen radiator hoses, you can take measures such as regular inspections, using high-quality radiator hoses and avoiding low-quality coolant.

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