I have been having over heating issues for quite some time. I installed a 180 degree thermostat, aux. transmission cooler, checked the clutch fan to make sure it was working properly. Finally, I called Magna Charger and they offered to reprogram my ECU, and also recommended buying a larger radiator. They said a lot of H2 are having heating issues with the stock radiators. They recommend Ron Davis Radiator, they have a direct replacment for the H2.
http://www.rondavisradiators.com/Welcome.htm
I ordered the radiator, but I will not get it for another week. I will let you know how it works.