1991 Toyota Corolla Logo
Larry Ellis
Larry Ellis Posted on Sep 27, 2015
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What cause lower radiator hose to collapse after cool down

5a engine with thermostat intact

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Ted Maxwell

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  • Toyota Master 3,519 Answers
  • Posted on Sep 27, 2015
Ted Maxwell
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Hi Larry:
Good observation. Not too many people would spot that.
When the engine is hot, the coolant is hot and expands. At the filler cap for the radiator, there will be a hose that goes to the overflow tank. As the coolant fluid expands, it flows through thie tube into the overflow tank.
When the engine is turned off, as it cools, the volume of coolant in the engine and radiator contracts, and is supposed to suck fluid back from the overflow tank.
I'm suspicious that something is preventing this from happening so the vacuum in the engine coolant system is collapsing the hose.
WHAT TO DO?
- Check the radiator cap. Make sure it is functioning correctly. Make sure that it is correctly installed and screwed all the way on.
- Check the coolant overflow hose. Make sure it is not plugged.
Odds are that you will find the problem quite quickly.
Cheerfuls.

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I would start by replacing the radiator cap. A bad cap can stop the flow of coolant from the coolant reservoir back into the engine when the engine cools down. This will cause a vacuum and collapse the hoses.

The other possibility is the lower hose is starting to get weak. This compounded with a radiator cap that is not functioning correctly will cause the the hose to collapse when the engine cools off.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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The other possibility is the lower hose is starting to get weak. This compounded with a radiator cap that is not functioning correctly will cause the the hose to collapse when the engine cools off.

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Unless there there is an obstruction in the hose blocking coolant flow.
Has the lower radiator hose been changed recently? Make sure there is a spring in the hose to prevent it from collapsing and restricting coolant flow.
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