It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
Did you have a verified concentration of coolant to water?
Replace radiator cap if hasn't been done recently. A $5.00 investment that is often overlooked.
Radiator is in play here. Either frozen or faulty.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!