ok so heres the deal my 97 xj was was hittin about 240 degrees and with summer coming up i needed to fix that i changed my tstat and water pump now when you start it up it starts screaming like a b*%&$. and not only that but i will start it up after sitting for a couple hours and with in 3-4 mins the temp hits 260 and shuts my engine down. i need some answers to fix this problem as fast as possible can anybody help me.

 

u mean the sound screaming? Water pump running backwards, belt to loose, belt to tight, bad new water pump?

 

Blown headgasket maybe? Check to see if oil is milky.

 

no the w/p seams good i think that screaming is due to the w/p pully its causing visible wear on the belt. and no my oil is good i dont think its the head gasket and when i turn my heat on to try to drop the temp down i just get cold air. im thinking it may be a air bubble. but im not sure how to get it out on a closed system

 

the screaming part could be that a vacume line is unhooked i did that the other day by accedent look for that

 

When its cold take cap off radiator *this is what we did with my friends im not sure if this is the correct way* and let it run. It will most likely get very warm and then all the sudden the temp will DROP fast. Therefore clearing all the air bubbles

 

Exactly. You have an air pocket in your system and the screaming is the water pump running dry. Hopefully you have not wrecked the pump by running it dry too long.

Sometimes squeezing the upper/lower rad hoses with the cap off can get some of the air out and following Jhosgood's advice will usually get the rest out.

If it starts to overheat with the cap off then try taking a short drive and going around some sharp bends. That has always worked for me even after changing radiators in several diff cars.