Jeep drops out of over
If you have a high mileage vehicle, or you have purchased this Jeep second hand, it could be a clogged cooler that is causing the overheating issue. How did the fluid look when it was drained?
Pull the lines off at the transmission and at the cooler. Use compressed air with a rubber tip to blow out the cooler lines. If the lines are not clogged up, then focus on the cooler itself. If it is the original cooler the factory installed, it may need to be replaced just based on age. Hot and cold temps will cause ANY material to fatigue.
Is the cooler clean (no debris between the fins or behind the cooler)? If you live in a dusty environment, this could cause enough heat build up.
To increase the cooling efficiency, you can move up a size on the cooler and you can use some spacers to increase the gap between the back of the cooler and what ever it is mounted next to. More air behind it will help it cool a little better.
Since it is a Jeep, if you have off road lights or a winch mounted in front of the cooler, you may want to consider mounting it someplace else to maximize the air flow it receives.
Other than cooler woes, I don't have many more guesses. If it were electronic you may or may not be getting a Check Engine Light. Might want to call a local dealership or a transmission shop to see if they have seen anything like this before.
2001 Jeep Grand...
on Jan 07, 2018