i also bleed the air out
i replace water pump and change the thermostat van still over heat on 1998 Chevrolet Venture
3.4L Engines have a bit of head gasket trouble. Have a combustion leak test done.
2 more answers , 1 more comment
Buy a noncontact thermometer(infrared) at Home Depot and such and take reading of the upper and lower temp at the radiator metal. There should be no more than a 10 degree difference. I suspect you have a bad radiator.
Was the engine overheated at all , BEFORE you changed the pump& stat?
yes it was overheating,and i don,t see no leak and there is no cooling in my oil