I have the same problem in my 98. I have already replaced the sensor in the thermostat housing and it still calls out "coolant sensor bad". I'm also going to replace the sensor in the overflow just because I can. If anyone can help with this, it would be much appreciated!
I've got the same problem with the sensor, anyone got some insight? (No stalling though)
If you already changed the sensor, have a look at the solders on the VIC circuit board. Seems to happen more often that they can get loose after time and cause messages like this. Just resolder them again.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.