My old 1996 Jeep Grand Cherokee had the 4.0-liter Power Tech, inline-six engine. The 1996 Grand Cherokee saw a minor restyling over previous year models. On the exterior, the grille, alloy wheels, front and rear bumpers, and foglights were updated, making it look rather stylish while sitting on the side of the road after I overheated on my way to work. The thermostat made me late that day.
To drain the coolant, I opened the drain valve on the lower-right side of the radiator. I had to disconnect the coolant temperature sensor before taking off the thermostat housing. Other than that, it was a pretty straight-up procedure. After I installed the new thermostat, I tightened the housing bolts to 15 foot-pounds and refilled the cooling system with a 50-percent solution of ethylene glycol antifreeze and water. To get all the air out, I ran the truck to operating temperature and then let it cool down completely three times, refilling the reserve tank to "full" between each cycle.
