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2003 Cadillac cts -- Radiator hose


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Why would the big hose to radiator collapse and go flat and reshape itself after taking pressure off antifreeze cap ??? THERMASTAT sticking ???? antifreeze was good level

That is odd and not something I have not seen

Are you overheating?

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There's a pressure relief valve in the radiator cap that is supposed to let air into the system as it cools down so that the system doesn't draw a vacuum. This is not the same one that is set to 15 psi to limit pressure in the radiator. With a sticking relief valve, or the wrong radiator cap, or a clogged relief hose, you can see collapsed radiator hoses. Make sure that the relief hose is clear and that you have the right radiator cap for your car. Any old generic radiator cap may not work properly with the particular cooling system configuration of your car.

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