Re: over heating problem
The engine bays on those ZJs are like ovens. I installed a Hesco High Flow waterpump and a new 3 row radiator that I bought off ebay, along with new rad hoses, and that solved my overheating problems. Prior to that the temperature that my engine was getting to, especially when using the airconditioning, was higher and higher with the age and mileage of the jeep. A cooler thermostat might make your engine run poorer and get worse gas mileage as the 02 sensors send messages to the fuel pressure regulator to lean out at a certain operating temperature. A 180 degree thermosstat will not allow that temperature to be reached before openning the termostat to flow the coolant through the rad. You could then run the risk of running a little rich....but for some guys they don't mind that.
2005 Deep Beryl Green WK 5.7L Hemi: QD II/ SRT8 shifter, petals, roof rails, wheels, grille, rear Brembo calipers, rear sway bar and springs/ body color mirror covers/ Xtreme HID 4300 Dims and Fogs/ Cabin Filteration Kit/ shorty antenna/ SC Flashpaq 91 tune/ full LED interior and partial exterior/ BWoody 4" CAI/Stillen headlight covers/ partial de-badging/ My GIG w Lockpick/ 22Elite leather console cover. Mods to come in the Spring: WK bilsteins, SRT springs, Bwoody end links and Brembo calipers for the front.