Re: 03 overland overheating
The fan spins 100-500 Rpm when engine is running to keep a minimum fluid flow in the system. When the engine heats up, the PCM should command the solenoid and the fan will rev up. If the solenoid wiring or solenoid itself has a problem, you could have a DTC set (normally DTC 1499). So check first if any DTC is present ( ignition key on/off 3 times and let it in on after the third time). When no faults stored, DONE will be shown. The solenoid itself is easy to replace, its hold in place with a Torx-T40 screw. Some power steering fluid will drip out, but if you have a new solenoid, you can install it without loosing much fluid.
Ofcourse the problem could be the fanmotor itself as well, but as it spins at low rev now, it seems to be ok. Just check by hand if it rotates easily with engine off. Watch your fingers, because the blades are quite sharp.
Check and clean the solenoid connector first, dirty or corroded pins could prevent the solenoid to be activated. The attached picture shows you the solenoid at number 5.