2002 Subaru Impreza WRX Q&A

2002 Subaru Impreza WRX Question: im having a problem with my car over heating

i think it my be my water pump i took the thermistat out and it was work but i decicded to put the thermistat back in befor winter and it wont put out heat out of the heater and it over heats -
Answer 1
Is the thermostat opening at the proper temp.? Does it overheat while driving at speeds over 35MPH? Was Proper coolant mix put in and air purged out of the system (warmed-up with heat on high -temp.-not fan speed)? Is radiator cooling fan cycling on when reaches operating temp.? -
Answer 2
with the car running, check for random air bubbles in the coolant overflow tank, if theres any, chances are it's your head gasket. -