The warm air of Xugong 500kl loader is not hot. Where are some warm water valves?

The landlord and I drive the same car. If the water temperature exceeds 60, it should be hot. The heater switch is on the left side of the engine, so you can see it. And turn the air conditioner counterclockwise to the end. If you have any questions about this loader, you can ask me. You should pay attention to check the screws of the engine bracket and the screws that fix the gearbox. These screws are all broken ...