Jeep new upper radiator hose is being sucked flat

2006-jeep-TJ-rubicon

I recently replaced the upper radiator hose, thermostat, and heat sensor, now the new upper radiator hose is being sucked flat, what do I need to check to resolve the issue?



You need a new radiator cap. Yours is not allowing coolant back in from the overflow bottle causing a vacuum in the radiator therefore collapsing the hose. That is why you see it in the morning when the engine is cool.