Mitsubishi cheetah runs warm air without heating the water tank

1 If the warm air is not hot, check whether the engine radiator water tank temperature is normal. If it is normal, check the heater tank (the escape ring is not good or the heater tank is blocked, which requires an experienced technician to diagnose. 3 If it is abnormal, check whether the thermostat and antifreeze are sufficient and whether there is liquid leakage in all parts of the engine. That's all for now. According to the failure of each car, as a reference.