The water thermometer of the pickup truck shows that there is no hot air at the bottom.

Check whether the actual water temperature of the engine is consistent with the water temperature signal obtained by the computer, and check whether there is corrosion or scaling inside the engine cylinder. If there is, it will cause insufficient water supply of the warm air tank, and it is necessary to eliminate the insufficient water supply to make the warm air tank play its best role. And check the water circulation of the hot air tank.