ok so my 96 was over heating changed t-stat and water pump. after bout a half hour of driving its up to 240. if i turn the heat on it will drop to 195-210 where it should be but as soon as i turn the heat off the temp jumps right back up. i have a 97 engine in it. does anyone have any ideas

 

You may have an air bubble in there, "Burp" the cooling system. Do a search and you will find the answer...Tj

 

i had the same problem in my 96 about 2 weeks ago. you probably have air in the system. you need to bleed the air out

 

n i had an air bubble in it when i changed the t stat and water pump it would hit 260 and shut down i got the air bubble out and it ran at 210 for about 1 day and then it started to overheat again. its not heating up that much

 

yea mine got to the 3/4 mark. i parked the front on a sidewalk, took rad. cap off, turned heat on high, and kept rad. full while i revved it up with my hand, after a few minutes air began to bubble out and it did it for about 10 mins and then no more air and no more problems.

 

i had my buddy do it for me while i was at work. is it possible that there is still more air in it.also i have a closed cooling system, do i just take the cap off of the overflow. and rev it up.

 

Could be the fan clutch is shot, try turning off the engine and see how many times the fan spins (should only spin a few times) if it keeps going and going like the energizer bunny..lol, its shot...Tj

 

If the heater core and blower motor are pulling enough heat off to cool the motor, it sounds to me like the radiator and/or belt fan are not. It doesn't take much crud to kill the heat removing efficiency of a radiator. That's where I'd start to look. '96+ should be self burping, if the rad cap is functioning correctly. With the ENGINE COLD, remove the rad cap and make sure coolant is up in the neck of the rad. If not, systems got air and rad is low on coolant.

 

i dont have a radiator cap its a closed system. it gets filled through the overflow

 

how do you have a closed system in a 96? it was discontinued after 90 if someone put a closed system in number one thing to do is change it out

 

trust me im trying there always ripped out when i go to the jy. i went to the jy last week there was a xj that they just put in there no body parts were taken i was the one that popped the hood, this was when they were closing. so i went back the next morning to pull the opened cooling system out and they already crushed the jeep.