If your 4x4 runs hot all the time, not just at idle, your problem is most likely an insufficient or failing radiator. Radiators deteriorate and can clog over time, but most of the time we make performance improvements to the engine to make more power and forget that more power means more heat. This Jeep is a cooling nightmare. The radiator is too small for a decent V-8 and there’s no room for a proper fan. As it is, the electric fan is partially hanging off the top of the radiator, pulling air over the top of the core instead of through it.