My 2001 Chevy tracker is overheating. I have
replaced the thermostat, water pump, and the fans
are coming on.
Did you purge the cooling system from the air pockets when you refilled it with coolant? If not here is how to do that... https://www.youtube.com/watch?v=zUpXgAJ1gjU
Did you verify the new thermostat opens? Put it in a pan with water and bring it to a boil, it should open prior to the boiling point. Sometimes you can get a dud so it's best to test them first. Don