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The interior cab heating system is identical to 4-wheeler cars. Two hoses connect to the cab heater core box, which is part of the engine radiator coolant system. If you're not getting heat when you turn on the heater fan, then one of the hoses is blocked or the heater core box is blocked up. One hose is inlet, which brings hot coolant from the engine to the cab heater core box. The 2nd hose is outlet which returns the coolant fluid from the heater core box back to the engine coolant system. Its likely these hoses and the heater core box are 20 years old and had never been replaced since the semi truck rolled off the assembly line in 1994. To diagnose for blockage, disconnect both hoses from the engine side, then connect an air blower to one hose to push pressurized air into this hose. Air should be coming out the other hose. If there's no air, or less air pressure, then there's blockage which is restricting hot coolant from passing through, resulting in little or no hot air when you turn on the "hot" air fan. Replace the heater core box first. If you're not getting hot air, then replace both hoses next.
my 580b case didnt have a block heater. i purchase a new one from my local dealer and the instruction tell me to mount it in the block on the drivers side. in behind the fuel filters are 2 plugs...or in my case 2 nipples because mine had a cab heater hooked up..it says to use the rear most port