Problem installing tank type block heater on a L553 skid steer with a Kabota V1902 engine. There is no where to install the heater hose on the water pump. Previous owner connected the hose by the thermostat housing. I tried that but cannot get the air out. Heater worked for a little while and quit. Seems to be air locked. To install the freeze plug type heater which it calls for it looks like I would have to pull the engine. Any advice?