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I had an older vehicle that overheated. I flushed out the radiator twice, but it was so clogged up, I had to replace it, so check the radiator. If you inspect the radiator from the filler neck, you can see if there is crud build-up on the tubes. The problem could be the water pump. Typically when water pumps fail, they start to leak from the weep hole(s) on top and /or bottom. Is there any leak from the pump? If there is, that is indication that the pump need to be replaced. Hope this helps !
Sounds like you had a sticking thermostat when you replaced the waterpump causing an air pocket. Replace the thermostat, and jack the front of the car so that the radiator cap is highest part of the cooling system. Then run the car and burp the air out of the coolant system.
I had trouble with overheating on my 2000 Grand Am, The dealer could not even resolve the issue,(they wanted to replace the intake gaskets)...I knew that was not the issue, no air leaks or water leaking there; so I sit down to think; what are the causes of overheating. Thermostat sticking - nope not it, water circulates, Water leak - nope not it, has water stays until it gets too hot and goes out overflow, fans working - yep...hummmm the only other thing I could think of was losing of water pressure, yep that's it - the cap on the coolant tank was going bad, got a new cap ($8.00) replaced the old one and no more trouble going on 6 months now.
If you are wanting to sell it "AS IS", I would sell it and not put anymore money into it. As far as the overheating, try replacing the thermostat, or the water pump. Do you notice if you have white smoke or drips in the drive way? The smell of something like syrup?
Run the vehicle for about 15 minutes in the driveway and then start looking are the ground under the car for radiator fluid that is leaking. Look around the top of the motor too...paying attention to the large hoses and the sides of the radiator. Watch the water pump area also. If you have a bad water pump...you'll need to replace it.
You need to check the water pump and coolant level. If coolant level is low you might have the air pocket in system. Overheating of the car can cause the damadge of head gaskette and engine block itself.