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Disassemble top of engine to access.
The check gauge light comes on because there is a gauge reading incorrectly. The gauge reading high could be from the cold, if it doesn't correct itself it will need tested to see if the gauge is the issue.
4.0L V8 is the same as GM #5 on the drivers side 3rd cylinder back from the front.
Coolant temperature sensor, low voltage.
We usually do, but some don't consider the water pump, until the water pump goes out. Then the price really goes up.
Inside the recirculation housing, you'll have to disassemble part of the right hand dash to access and remove.
Run scan data to determine the operating function of the fuel trim, and correct it.
Is it missing or does it not running as normal.
In my opinion it will be the sending unit.
Have the computer scanned for the codes, then post them so we can help.