Hitachi 120 excavator's warm air is not hot.

1, first of all, the thermostat is always on or the thermostat is turned on too early, which leads to the large circulation of the cooling system too early, and the outside temperature is very low, especially when the car is driving, the cold air cools the antifreeze quickly, the engine water temperature does not come up, and the warm air does not heat up.

2. Secondly, the water pump impeller is damaged or lost, which makes the flow through the warm air small water tank insufficient and the water temperature too high to clean the water tank. The heater uses the circulating water of the engine to supply heat to the cab through the fan at about 90 degrees. If the engine water temperature is normal but the warm air is not hot, it means that the circulating water has not taken a big cycle. The above is the content that Hitachi 120 excavator is not hot.