How to fit a heater thermostat to kia sedona 2.9 diesel automatic

we dont' show any diesels here in u.s. manual but sending a pic along drain coolant belwo thermostat undo bolts remove a nd replace revers disassembly and fill with coolant'. If you aren't getting heat, check bot h heater hoses for hot and if they are check for a water vavle not working if you have oneor an actuator in heater. terminal 3 shold get 4.7 volts whe terminal 4 is grounded