I am having the same exact problem as Tr1pl3 is having. The car is overheating and there is pressure in the radiator that blows the cap off the overflow res. The top hose is hot but the buttom remains cold. I have had the radiator replaced so I'm pretty sure it isn't clogged as some suggestions might have mentioned.

Water pump perhaps? But as some of you have mentioned; the water pump rarely goes out.

Clueless. Tr1pl3 have you found the solution to your problem?

 

Nvm. Problem fixed. I bled the antifreeze and now it is working fine.....(crosses finger)

 

ya the f-n guy that put the engine together put the head gasket on wrong and there was build up on it... the guy put that fix gasket stuff.. but im getting new gasket kit. and the bring the head to a shop... so ya... thx for all your help guys is there anything i should do. while i have it apart... any DIYs