Q: Why Do Hoses Collapse?

asked by on November 20, 2015

Why do hoses collapse?

Hoses undergo a variety of system changes during normal engine operation. When the engine is completely warmed up, pressure inside the cooling increases to around 18 - 20 psi. This causes the hoses to expand.

One hose in particular has a tendency to collapse. This hose is the suction hose for the water pump. The water pump causes a low pressure area to form in the hose connecting it to the radiator. To prevent this hose from collapsing due to low pressure, a wound wire spring is inserted into the hose near the water pump. This wire provides internal support to the suction hose, similar to the frame of a house.

Another cause of collapsing hoses is a cooling system that is low on coolant. When the engine is warm, cooling system pressure increases. However, when the cooling system cools down, the air volume inside the cooling system draws into a vacuum which causes all hoses to collapse.

Periodic inspections of your cooling system, coupled with servicing hose components that are soon to fail, should prevent any hose from collapsing. If you need any assistance with this, reach out to a professional mechanic who can inspect and replace your hoses if necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Gas pump continuously shuts off when filling up tank.

The vent hose on the fuel tank to the fuel filler neck is plugged up and is not allowing the air (fumes) to cycle through the system as the fuel is being poured. To verify this, the next time you...

What Are Hose Clamps?

Hose clamps are used to firmly attach an engine hose to a connection point. The most common type of hose clamps are flat, metal bands that use a worm screw inside of a buckle. The loose end of the band...

Heater not working and car overheating.

The first thing to check is if the coolant is low. This car is known to have a problem with the radiator leaking coolant on the sides and may have leaked most of the coolant out. This is why your...

Related articles

Symptoms of a Bad or Failing Heater Bypass Tube
If you see coolant leaking under your car or smell coolant from your car, you may need to replace the heater bypass tube.
How Does Cold Weather Affect Car Hoses?
Cold winter temperatures can cause damage to car engine hoses. Inspect car hoses during the cold months to make sure they're in good shape.
Is a Kinked Hose Still Safe to Use?
Hoses Hoses carry fluids from one point in your engine to another. For example, the upper radiator hose carries hot water into the radiator from the engine, while the lower radiator hose moves cooled coolant out of the radiator into...