Gotta be a head issue then...

 

So, down the hi-way it'll run verifiable 200 indefinitely?

 

On the highway? Yes, 200-205 but as soon as you come off the highway things get hairy as speeds decrease, and when I come to a stop, it gets hot.

Could it be a head gasket? Or would this be a cylinder head crack?

 

but is it working prop

 

system needs to be pressure checked b4 spending more money

 

air flow issue guys quit over thinking it up grade fan clutch to grand cherokee one

 

I agree with you that it sounds like an air flow issue. But the only major difference between his cooling system and a std XJ one is the radiator. He's says it was doing the same thing with an OEM radiator,which I'll take for granted it and the fan clutch were in workable condition,why would he have an air flow issue?

I did put a ZJ fan clutch on mine when I recently redid my system but whether I would have gotten the same results with a std one I don't know.

 

Forgot to mention it has been pressure checked by 2 diff mechanics they found nothing wrong

 

On a warm engine the fan is TIGHT very difficult to move.

 

When my jeep did that (over heating when not moving) it was a valve. I can't remember the name of it.

Follow the medium top radiator hose, the one next to the main large hose. You see the valve it connects too, along with a bunch of other hose.

Replacing that fixed it for me. Sorry I cant remember the part name.

 

It overheits while moving too ... It overheats during driving or after driving and coming to an idle... Top hose is so hot and tight. Just drove to the store on the way it started to get really hot so I blast the heater to keep at 210

 

Do you have an aux fan? Stock electric one might help you out.

 

Ya I have mech and aux fans stock... Both work like there supposed to

 

Sounds like a circulation issue.

 

But everything is New...