Pull the thermostat out FIRST and recheck. With out the thermostat, you should see water coming out of the head as long as the engine is running. If you don"t, then pull the pump.
If you do see a lot of circulation without the thermostat installed then I would expect you have a thermostat that"s defective and not opening. You can check that in a pan of hot water. Heat to 180+°F (or whatever the rating is on it)and see if it"s opening.