komatsu pc50 heat not working

I have recently picked up a pc50.



The heat is not working at all, it just blows cold air.



I blew out the heater core and filters so its getting good air flow. It seems there is no coolant circulating as the hoses going to the heater core are cold.



The fan itself sounds and rough shape. I'm not sure of the temp control dial is working or if controls anything.



Any suggestions??



Thanks

komatsu pc50 heat not working