As I said in your other post, waterpump.

Corrosion might have worn the fins off, could be stuck/clogged, etc...

 

yes i have an overheating problem as well.. people tell me to just change the thermostat and radiator cap.. but wut if that doesnt fix it.. sorry im not all smart with cars n stuff but wut else could it be ?? and how much would a water pump cost me ?? thanks

 

if its not your radiator cap , thermostat, water pump, calciumed filled radiator, bad timing, running to lean, fan not kickin on, then its your head gasket boiling up the water and causing it to over heat