radiator hose under pressure
 

I have a 88 rx7 and i just took it out of storage today its been parked for the last 6 months for winter. I'm confused why the top radiator hose is expanding. it looks like its gonna pop but i drove it like that for about 25 miles today. when i squeeze that hose when the car is running at full temp or after being shut off that hose is under tons of pressure and it is hard to squeeze it. It seems as its not moving coolant, but the car is NOT overheating or smoking or smelling weird at all. The car is running great i put a new thermostat in it anyway and it did not do any good.