HOW DO YOU CHECK FOR AIR POCKETS IN COOLING SYSTEM?

Good indication is if only one heater hose is getting hot. To bleed the air out , have the radiator cap off, and run the engine up to operating temp. when the thermostat opens you will see the coolant level drop, keep adding fluid as necessary until full. At first coolant may spuew out of the radiator, but that is just air being pushed out of the system. Put the radiator cap on once full while the engine is running.