the guy that i bought my xj from told me that they are suppose too run at 210 or so but its seems to elevate wen im on a road trip or have just had it on for along time
just trying to ask what temp should my 89 4.0l 6 cylinder always be running at

 

210 ish

 

alright its seems like it gets hotter wen ive been on the highway doin 75mph for awhile

 

shouldnt go much over 215, which is when the fan is supposed to kick on.
Mine runs right at 210, doesnt matter if its 70* or 30* out. I dont have a efan or a mech fan shroud...

 

You might need to make sure your auxiliary fan is turning on. Its supposed to turn on I think any higher than 215 if memory serves me right. Take a photo and show us how high its getting. Also make sure the auxiliary fan is actually plugged in and wasn't accidentally unplugged.

 

The vast majority of 4.0 engines will run between 200 and 210. There can be some variation.

Your temp shouldn't vary much though between city and highway. A trail push is a bit different.

Be sure cooling system maintenance is up to date. Fresh 50-50 conventional (green) coolant with a new 195 degree thermostat purchased either from Jeep or the Stant SuperStat. Fresh radiator cap as they are often overlooked.

Then see where you're at.

Also know that there can be some inaccuracy between the sending unit that measures the temp and the dash gauge.

 

I have a 160 degree thermostat in mine and i have never had any overheating issues. But I also have a new readiator too so that could play a factor..

 

Ive always wonderd about what temp they should sun at. Mine stays a little above the 1/2 way mark between 100 and 210 .. it seldom gets higher than that. 88 with the *closed* system.

 

160 is too cold

 

it seems like my auxilary fan is wired directly so its always on wen the engine is on

 

mine temp gauge will rise slightly from 210 but not quiet to where its overhaeting

 

I wired my electric fan to a switch it helps alot on trails some thing else you should try i was shocked it worked take an air compressor and blow it in front of the radiator and get all of the dirt and dust out of it it helped with mine

 

i have a new radiator and a new fan clutch and thermostat also i think she just runs a slight bit hott

 

Hows the water pump and any air in the system

 

In reality, there's no such animal as to 'a temp it should always be running/pointing at'. If going by the factory gauge, I would think something is out of wack if the gauge varied below 182.5F (motor warmed up winter) or above 235F (summer). This time of year (cool/cold ambient), I would think the needle would point somewhere between 182.5F and 210 in 99.9% of driving conditions, presuming a clean and properly functioning cooling system.