2001chevy malibu overheating

Hey how's it going? I have replaced my thermostat and my water pump is working fine. It does not over heat while at idle in my drive way. The car keeps
Overheating every 20 miles or so. It is also dumping coolant and water from the overflow tube. I'm stumped
Any suggestions for me?

Does the upper rad hose get hot? Did you put the thermostat in properly?...sry i've seen people do this. Are the fans kicking in when you turn on the A/C? Do the fans ever kick on?

Did you check the $6 radiator cap first???