I constructed a flush tool which I could use to inject water and or air into the heater core. I disconnected the appropriate hoses and forced out the existing liquid in the heater core. With a drill pump I injected some Liquid Plumber into the heater core and left it sit in there for two hours. I then flushed the system out with water and air, alternating the flow direction. Much more rust came out this time than before. I reconnected the hoses and filled the cooling system. The engine was started and warmed up to operating temperature. Prior to this latest cleaning I could not get any heat on any setting. I now get 125 degree heat out of the dash vent, only on the vent position. When turned to bi-level, defrost, floor, only cold air comes out. The temp at the house which comes off the water pump was 205 degrees. The hose travels about a foot to a T. We now have two hoses. One goes into the fire wall (126 degrees) and the other twards the drivers side (166 degrees) The hose that goes to the drivers side then meets up with another T. We now have two hoses agin. One goes into firewall (166 degrees) and the other one goes into a sensor which is conected to the thermostat housing. (219 degrees)
I really question the accuracy of the thermometer, as I get different readings on the same hose almost every time I take a reading.