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Normal Operating Temperature Range

4.1K views 9 replies 9 participants last post by  vanhalo  
The engineers designed the JK cooling system fan to come on at approx. 224-226 degrees, unless the A/C is on then it get a signal to come on when the pressure hits its set point. Now the cooling fan is a variable speed fan so the hotter the coolant temp, the faster the fan pulls air though the radiator. Like has been mentioned when was the last radiator flush? How many miles, last cooling system service, water pump, thermostat? Does your fan sound like an aircraft when your temps are close to 240 degrees? Is there anything in front of the grill to impede air flow (winch, lights, ect.) Mine runs anywhere from 195-220 (even in 100 degree temps) unless I'm going up a long hill or mountain, then it hits 230-240, but cools back down fast afterwards. Good Luck.