Has your temp gage come up to operating temp? There are 2 heater hoses on the right side of the engine compartment going up into
the cab to the heater core, are they getting hot? you may want to try turning the A/C off and see if you get any heat. Also, check your
coolant in the radiator (when cool) and see if it is full. If you get an air bubble in the system and it finds it's way up into your cab heater
it will prevent the warm coolant from circulating up into the heater core in the cab. I can't remember for sure, but some tractors have
a valve to shut that flow off going up into the cab (for summer), which would be visible from the right side of the tractor, between the engine and the
bottom front of the cab where those hoses go into the cab and up to the heater core.