There is a Chang 'an star, the water temperature is just right, there is no air. After the temperature rises, there will be warm air when refueling, but what is cold air without refueling?

First, let's see if there is a thermostat. If there is no thermostat, the water thermometer shows that it has come up. In fact, the temperature has not reached more than 80 degrees. It's just an analog instrument, not very accurate. If there is a thermostat, it depends on whether it works normally. This should be deleted and tested.

There is nothing wrong with the above, but the warm air tank is a little blocked, which means that the water flow is too slow, and the water flow is slow when no oil is added, and the water will not be hot when blowing.