Hi again all, I am having overheating problems with my old 89 Comanche and have decided to do the closed cooling system changeover. I ordered a 3 row radiator with twin fans already for a 93 cherokee, my question is I just changed the water pump a short time ago for the old system. Do I now have to go to a newer style water pump> What about the thermostat housing? I have an overflow tank from a 95 cherokee already to use and I will be getting rid of the valve mess under the old coolant tank and just running lines straight into and out of heater core. Thanks all!