Hey guys, I have an 01 Sport 4.0 in stock form. No lift or anything. Coolant level is full and doesn't lose any at all. I've noticed since I've installed a new fan shroud it is running a little bit cooler- like 200° or less. I've read jeeps like to run best between 200-210. I have a Stant thermostat just can't remember the degrees.
Is this normal or should it be a little warmer? It's 15-30° here now and after a, 30min drive this is how warm she gets....

 

Before you get to concerned you should verify the temp with an I.R. temp gun aimed at the t-stat housing.

 

Didn't think of that! I've got one but it's an hour away....I am running a Advance Auto BWD temp sensor so that could be off..

 

Could. Definitely verify. A 180 degree thermostat might do that.

 

That is where mine reads all the time (when warmed up). OBD scan shows 210 degrees. The point is do not trust a 2 bit dash gauge. IR thermometers are not accurate but will give a ballpark. They work better if you paint the target flat black.

 

I changed water pumps and got new coolant, my temp gauge now says about 150-175, the temp gauge is fairly accurate. On a 1991 cherokee. It wont get any hotter.

 

my obd II scanner shows i run around 207.

 

Your heep is screwed. You verified temp with an IR gun? Prob need a thermostat that isn't stuck wide open lol

 

the normal operating temp on 4.0 XJ is 195 to 210,they run the 195 thermostat,I have played with lower temp t-stats,just never ran right,mines happy at 200

 

According to the FSM, if 160F is reached in X amount of time, a warm-up cycle is counted by the ECU. Likewise, the ECU turns the efan on at 218F. One could presume the normal operating temp "range" to be 160F to 218F. Nowhere in the book is normal operating "temp" referenced........not 195, 200 or 210.

 

Yep. Most will run 195-213.

 

my 2000 runs at a steady 200-210 all day long no matter what i am doing

 

do some donuts in the snow maybe shell warm up.....oh wait that's a little extreme

 

My 92 runs around 150, but when i come to a stop the temps spike to 210+, especially when getting off the highway

 

turns out it wasnt a coolant system thing, my oil pressure switch was bad