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Q: New Radiator hoses keep flattening out

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I have changed the top radiator hose but the bottom hose looked ok. Now both hoses are flat. What could be the cause

My car has 100000 miles.
My car has an automatic transmission.

If you are having the coolant hoses being sucked flat then it is caused most commonly from the radiator cap vent is clogged. You should check the radiator cap and replace cap if it is gummed up and then flush the complete cooling system of dirt and debris in the cooling system. Have a mechanic like one from YourMechanic verify and test the cooling system for you.

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