1997 Pontiac Grand Prix Overheating

I'd have to use a non-contact thermometer, to see if engine temp is close to the gage reading. Are there any over-heating issues besides the temp gage reading? Overheating is usually a boil-over, the pressure will pop the radiator cap and the overflow bottle, where applicable, will fill up in a hurry. Any applicable trouble codes? Did you check for coolant flow through the radiator, where possible?

Engine is very hot, top hose is very hot.
Should I check water pump b4 radiator flow?
What about air pockets in the engine?

I'd leave the thermostat out, hook everything up for testing. The flow through the radiator is instant, without thermostat. If the engine is too hot, the fan should be running like crazy. I guess I'd have to look at it.

replaced the water pump and completely filled system. Radiator was hot, had heat in the car for a while, but temperature fluctuated and so did heat for about five minutes then overheated again. No it won't even start.

after cool down. Don't know if its related, but cuts out at about 4k rpm. I'll take it in

after a flush, the system ran great. kept constant temp around 190. Good circulation, good heat in the car. Soon after it overheated again. I can't seem to keep coolant in it but cannot see a leak. Could it possibly be I'm burning it?