THIS IS MY FIRST TIME ON ANY FORUM I DIDNT EVEN THINK OF USING A FORUM UNTIL MY BUDDY TOLD ME THAT THIS IS HOW HE FIGURED OUT A HOLE BUNCH OF PROBLEMS ON HIS CAR. I DRIVE A 2000 JEEP CHEROKEE WITH A 4.0L INLINE 6 AND MY ISSUE IS THAT MY ELECTRONIC FAN RUNS ALL THE TIME EVEN IF IT IS -20 OUT I HAVE REPLACED THE RELAY, THERMOSTAT, THERMOSTAT HOSING SENSOR AND CHECKED ALL OF THE THE FUSES AND NOTHING HELPED. THERE IS A CHECK ENGINE LIGHT BUT IT COMES AND GOES. I ALSO THINK IT IS DRAINING MY BATTERY SOMEHOW BUT THAT MIGHT BE SOMETHING ELSE CAUSING THAT. ANY IDEAS PLEASE HELP!!!!!!