I was checking my oil level yesterday and noticed my radiator hose was collapsed closed. I turned on the car and warmed up the engine and the hose returned to normal allowing coolant to flow. I allowed it to cool overnight and noticed this morning it's collapsed again. I opened the radiator cap it as soon as I let the pressure release the hose went to normal again. Any insite on if it's a cap issue or hose issue?

 

I'd say a cap issue, the vacuum is not being released by the cap vacuum valve. The cap limits both high pressure and vacuum or more accurately pressures lower than the ambient atmospheric pressure.

 

I would say you have a cap issue as well.

 

3 for 3, CAP!