What to Do About a Collapsing Water Hose

Water hoses pump water from an automobile's radiator through the thermostat and into the water pump. The vacuum formed by the sealed radiator and the water pump causes the water to move. It can also cause the collapse of the water hose. When this happens, there a few things to consider before immediately blaming the cooling system. Sometimes, the problem can be fixed by changing just one part. Only in more serious cases does the cooling system need an overhaul.

Check the Radiator Cap

The radiator cap helps to create the vacuum so that the water can be pumped as needed through the system. A faulty radiator cap can create too much pressure in the hose, which will cause the the hose to collapse once the water pump starts to work. You can check the radiator by opening the cap after the collapse. If doing so causes the hose to go back to its normal state, the radiator cap is the problem. Purchase an aftermarket radiator cap at an auto parts store to replace your old one.

Check the Hose

The lower water hose is the one most likely to collapse. Remove one end of the hose from the radiator and shine a light inside. You should see a spring that supports the hose. If the spring is missing or broken, then the hose will collapse. You will have to replace the hose. Have a professional check the hoses for a blockage that can also raise the pressure inside the hose and cause a collapse.

Inspect the Cooling System

Other parts of the cooling system could also cause pressure issues and hose collapse. The problem could be anywhere along your cooling system. A professional mechanic can flush the system of obstructions or carefully inspect it for other issues. You should seek this professional help, especially if your hose collapse is accompanied by your vehicle overheating.

Other Considerations

Replacing the radiator cap is the least expensive option, so start there. The lower water hose can run more than $50, depending on the type of car you drive. Replace that hose if it is damaged. The next expensive option is the radiator flush and inspection, which can become costly due to the amount of time spent researching your problem. Consider this option if the other does not work.