I have an NAA with a Wagner WM4 loader at the front and a Woods Mower currently mounted on the rear. I have about 20 acres of weeded fields to mow and am dealing with an overheating problem I believe is caused by a leaking radiator. I tried Bars Leaks pellets which requires running the engine for half to three-quarters of an hour. During that period, although there was minor leaking, the temp. gauge never got out of the green zone, even after an hour of running in place and at idle. However, when I went to mow it wasn't long before it overheated and started losing substantial amounts of coolant. Normally, I'd remove the radiator for repair or replacement but with the loader cross-member just above the hood, I'm prevented from raising the sheet metal more than an inch or two (I can only open the hood opening just enough to add fuel). Removing the loader is probably going to call for dealing with rusty bolts and with snow coming soon I'm hoping to find some way to run the mower long enough to at least do the field edges. If I were to try Alumaseal or some more modern stop-leak product I guess I'd have to flush out the Bars Leaks as there's probably a compatibility problem. Has anyone been able to remove the radiator with that loader in place ? Of course the leak could be a head gasket, water pump, slipping belt or thermostat problem. But the thermostat is new and it seems that it only leaks when under load. It didn't overheat and the thermostat held the temperature when it only idled during Bars Leaks installation. I'm thinking of trying to mow with the radiator cap loosened to lower pressurization. All in all I'm looking for advice on a strategy to follow to get some mowing done before I pull the loader and the radiator.