unidentifiedbomb

During the summer mine typically stays at 195, but during the winter it usually stays at 180, not sure if that's normal for a renix

Kalali

206.825°F, measured at thermostat housing using a fully calibrated laboratory grade temperature gun.

salad

Easy. 50C is halfway between the points where water breaks **** and stops moving, and is liable to violently explode. It's also roughly 1/3 hotter than us fleshbags.

Your Jeep will be fine if maintained. The 4.0L is a bit big (in terms of thermal load) for the thing in the first place but the system works. Above about 215F a LOT of things kick in. People see 205-210F as their normal operating temp and think "Wow, only 30 degrees to go! Nice margin". Not so simple. All of the cooling system components have a range of capability which is engaged more as the temp rises. For example the thermostat opens more, fan clutch engages more, and if it had to the PCM flips on the aux fan. The XJ's ability to reject heat is NOT linear.

So make sure the stat is good, clutch fan is good and shrouded, and cooling system is air- and gunk-free and you'll be fine.

That said automatic transmissions screw all that up in a hurry by dumping their heat into the radiator. Loads like trailers and big tires without different gears are the main problem.

Well then. Lol

salad

Nope. Min 195. Is this measured at the thermostat housing or the Magic 8 Ball dash gauge?

unidentifiedbomb

Dash guage, seems right since I barely have heat

djb383

180 should be plenty hot for a good heater, presuming 180 is accurate. We run a 180 stat.....heater works fine even in recent mid-teen ambients. Sounds like u may have heater issues if it's weak.

djb383

U must be bored......there will be another oil thread along for u shortly I'm sure.

salad

Yes I hope so. Days are getting short and I'm left to trolling other folks' threads! LOL

djb383

ROTF,LMAO!

djb383

What does our XJ typically run????.....it depends on a number of factors. It typically runs with-in a 55* degree range. With a 180 stat, our XJ will float around 175-185 this time of year (cool/cold weather)......closer to 175 when running the heater, closer to 185 when not using the heater. In 3 digit ambient, stuck in traffic, running a/c, we've momentarily seen 230. Does it ever run 210?.....maybe for a few seconds.

In 4 seasons worth of driving, the ScanGauge will show a coolant temp hi-lo range of 175 to 230. The ScanGauge shows the same hi-lo coolant temp range throughout 4 seasons of driving in our other vehicles as well.

para32

190 -200 (assuming my gage is accurate)
But dont worry, with 50-/50 PG at 16 PSI (stock rad cap pres)
Your boiling point should be 267 F

djb383

Regarding the XJ temp gauge, if the needle is not pointing directly at 100, or 210, or 260, at what temp is the needle pointing?

watertrucker

My 96 XJ 4.0 usually runs at 210 or a little less on dash gauge. Installed mechanical gauge and reads 20 to 30 degrees cooler than dash. 180-190. running 180 degree thermostat and GC fan clutch.

djb383

Very interesting.......your numbers r about the same as our numbers and we also use an aftermarket gauge and a 180 stat.

drhoward1988

Here ya go salad....