There are two valves on the machine body, which are respectively connected with the water inlet pipe and the water outlet pipe on the heater. The corresponding upper and lower threads are connected to the water inlet and outlet pipes, and the vertical threads are connected to the radiator.
The warm air of the car uses the water temperature of the engine water tank to provide heat, which belongs to waste utilization and basically does not use oil, so we don't have to be afraid to turn on the warm air as much as we are reluctant to turn on the air conditioner.