why is my 1976 buick century run hot when i have change the water pump and radiator%3F

Could be thermostat sticking closed, bad radiator cap, radiator hoses collapsing, low on coolant, blown head gasket or fan not operating properly. When does it overheat? While at highway speeds, only when idling or all the time?

while on the highway

i changed the thermostat as well

Double check your hoses to see if they are collapsing. Check coolant level. (Did you properly bleed all the air out of the system) And make sure the radiator cap is in good condition, proper psi and sealing properly.

dandyoun has it covered well, but if I may: it has V-Belts, right? Not serpentine (1976) is the belt for the water pump ok? Reasonably tight?

Good catch fordnut. Good evening my friend.

Back at ya.

ate there diff water pumps for this car. i have done all that u have said? would it be the block?

didnt know when i got this car that the other own put pepper in the radiator :(

If all the above checked out I would check for a blown head gasket.