Could a messed up/plugged Cat cause my 1994 Cherokee Country to get up to about 230 degrees while idling, but then run around 210 like normal when driving at like 45 mph??

 

Anything?

 

a plugged cat would be more of a loss of power symptom

 

clutch fan been checked

 

Yeah, mechanical fan is very strong. Hear it really well inside the jeep when cruising. Also seems good at Idle. Don't really know how to check more than that.

 

when motor at temp spin the fan by hand should be very stiff motor off of cousre

 

Tested that, I can spin the fan a little with one finger, but it doesn't like keep going at all. It's pretty stiff.

 

does your aux/ac fan work

 

Just died on me actually, after I wired it to a switch in the cab. Switch is good, fan just died. But even while the fan wasn't working, but Jeep never got above 210 while just driving. Now while I idle it creeps to like 230/240, but when I'm cruising it stays under 210 like normal. I'm stumped. Slightly leaky Radiator I've had for a while, but never did the heat-climb even with that.

 

fixing the fan would be my first chore here then see if it comes on when it gets hot to help cool down

 

Like I said i wired the Auxiliary fan to a switch so I can just flip it on when I know I'll be running her hard, but even when the fan never came on it wouldn't creep above 210 unless I was in 4x4 off roading. Now idling it'll hit 230.

 

is your coolant mixture correct? a buddy of mine blew up their subie from running pure coolant

 

Yep. Autozone full strength coolant diluted to 50/50.

 

id put a new clutch fan on and see what happens

 

Hearing the fan "when cruising"....that's a good indicator that the fan clutch is working AND that the motor's running hot. What/when was last cooling system maintenance done?