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Collapsing Radiator Hose
Your hose is not bad.......
The reason it is collapsing is that the radiator cap is plugged up. There are two functions in the cap... a 15psi regulator for pressurizing the system and a reverse flow "vacuum breaker" to let the air into the tank when the system cools. The vacuum breaker function can get clogged up with Dexcool residue and doesn't let the air back in. The big issue with this... is that your system will probably not pressurize fully when it gets hot next time and your coolant boiling temperature will be lowered.
Most of the time, you should be able to clean the cap with a brush under running water in the kitchen sink. Just don't get caught.
This is a maintenance item that is often overlooked.
Regards,
Mike
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