The temperature will climb when the vehicle is under load. However, unless you're in 110° ambients, it shouldn't go over 105°C.

If it does, you've got two major possibilities:

1) The clutch fan is shot. Shut the vehicle down when it's quite hot. The fan should stop instantly. If it spins, change the clutch fan. The switch to the 606 fan clutch is recommended as a cost reduction.

2) The radiator is 20 years old and the fins are partially blocked. You can remove the radiator from the vehicle and spend a couple of hours with some condenser cleaner and an air compressor..........or just replace the radiator.

One or both of the above will be the likely culprit.