im running a 160 in my 94 cherokee (4x4 4.0). I never have issues with overheating, even in heavy slow moving high heat traffic, ac blows cold and it doesnt over heat. man i love jeeps! *knocks on wood*

Actually, that's false. On OBD-II systems, the PCM does not monitor the t-stat....it monitors when the coolant sensor sees 160F (a completed heat cycle is counted) and when the coolant sensor sees 218F (turns on efan, if equipped with HD cooling).

so it will run fine with the 180 the computer wont think its not warm and dump extra fuel ?


also b4 i get into this water pump anyone else change one yet if so how hard is it and how long will it take

OBD-II uses the O2 sensor(s) to determine rich/lean mix. Ours runs fine year round with a 180. It's of no significance how long it takes u to swap a pump....take u r time, clean the sealing surfaces sterile, use a thin layer of rtv on both sides of the gasket and DO NOT OVER TIGHTEN THE BOLTS.

lol ok ill go easy on them i just got a new belt and the 180 today im about to take a short video of this fan problem i know its not right i even dose this while im driving

Cudos bro, I did the same to my XJ but i did it directly to my ignition switch so as soon as the car is on the FAN is ON. Did it after I blew my head gasket once. Now it's always on and runs great even on stop and go LA, CA freeways traffic

With my 5.2, going down the road, 200ish, provided its not over 100 degrees. Lately its been 101 to 105, normal now is 215ish. In traffic, its peaked at 220 then dropped the minute I started rolling. AC full blast listening to tunes the whole time.

Ron

Freeway 190
Street 200
Idol 205ish

190 freeway, 210 everywhere else

Ok so now my coolant looks like mud and my rad is like 5 months old why dose it look like this

when you did the rad did you back flush the entire system? if not the sediment in the system accumulates and then if you used hose water it took those minerals and got worse. only used distilled water in the cooling system. hose water will eat it alive

Here's pics

160 bouncing down the freeway at 75-80 in 100+ degrees. 180-190 in city in stop n go in 100+ degrees. I've actually tried to get to 200 & I can barely reach 190.

Hmm so what do you think a really good flush then all new clean coolant I just wanna figure it out b4 I put a new thermostat and pump on it

99XJ,

All I have to say about those pictures is OHHHH MY GOSH...... ;that is some muddy coolant.

You should do a chemical clean and flush of that system, then remove the radiator and have it chemically cleaned.
Replace the thermostat with a 195*, replace the thermostatic clutch fan with one from a ZJ, and replace the radiator cap.
That should keep your engine running cool....