Re: 4.7 V8 Grand Cherokee High Coolant Temperature
Any vehicle can have an issue with the thermostat, the 4.7 is not different. You did check the coolant in the radiator, or only in the overflow reservoir? If there is a leak, the overflow reservoir can stay full, while the level in the radiator goes down. Check the level on a cold engine, it should be right under the cap.
If necessary, the thermostat can be changed easily. It sits just behind the aluminum housing where the lower hose connects to the engine. Two bolts and it comes loose, but the whole cooling system need to be drained.