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I have a GB. Sounds like your radiator is stopped up. My GB has two drain plugs at the bottom sides of the radiator tank. With a cold engine remove them and flush the radiator with a water hose. Use a nozzle and put pressure from the bottom and the top until you get good flow. Mine had so much gunk in the bottom that Nothing came out when I removed the plugs. Gentle prodding started a flow and rusty gunk came out. Even on a properly working cooling system, the bottom of a G radiator takes a while to warm up, but after 10- 15 minutes it does. Another tip to help the thermostat open is to drill a small hole in the middle of the outside flange before installing it. 1/16 inch is large enough, but no larger than 1/8 inch will do. You want just enough water to constantly flow by the thermostat so that the hot water from the engine will get to it and slowly open it. Otherwise the thermostat on a cold engine will remain closed too long waiting for the heat from the engine to activate it, then it will open suddenly overflowing coolant. Then the cold water will hit it and close it again and the process repeats until all the coolant is warm enought to keep it open. The problem is that the thermostat being located in the radiator is located too far from the engine to work properly on a cold engine. Back in the 50's all thermostats had this small hole in the flange, but replacements today do not. I would recommend you not leave the thermostat out forever as they are needed to keep the engine operating efficiently, especially on LP tractors with the hot water going through the LP system to heat the LP. Either buy a new thermostat or check yours to make sure it is opening. You can do that by boiling some water in the kitchen and dropping it in. It should open immediately. Be careful you don't get caught using the good cookware. I would try the above mentioned radiator flushing, then check hoses to make sure they are not collapsed internally. That should improve your flow if the water pump is working properly. Usually water pumps work and are not the problem. They usually start leaking as a problem, but they still work. Maybe someone else has other suggestions. Let us know how you come out.
John
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