I have an overheating problem on my 97/98' Cherokee 4.0 Sport. In a slow city traffic with AC on the temp raises to 220-230 with consequence the cooling liquid boiling and is thrown out.
I have replaced thermostat, radiator valve, fan and the fan clutch for new. The problem is still existing. I am planning to mount and test a new radiator to see what happens.
The interesting thing is, when I switch off the AC the overheating issues disappear. But I need the AC..
Thanks

 

Does your electric fan work?????? It should kick on when you turn the AC on.

 

so the problem is only with the AC on. As Photon asked, does the elec fan kick on when the AC is on?

 

A radiator may be the problem and for a $100 at AutoZone fairly cheap to replace.

 

radiator cap?

 

Chris, did you fix the problem?

 

I maybe way off here, but I would check to see what condition and state your serpentine belt is in. With the extra drag of the A/C compressor, the belt might not be adequately turning the water pump. Just another thought.

 

i agree had the same problem on my 99 rad was clogged and with the extra heat the condenser put out w/ the ac on it would over heat,
yes make sure the electric fan works (im pretty sure it does because you never said the a/c quit working or became warm)... if the fan works i pretty sure the rad is the culprit