The reasons why the car warm air is not hot: The possible problems of the cooling system are as follows: First, the thermostat is always on or turned on too early, which leads to the large circulation of the cooling system too early, and the outside temperature is very low. Especially when the car is driving, the cold air quickly cools the antifreeze, and the engine water temperature does not rise, so the warm air will not heat up.
Second, the water pump impeller is damaged or lost, so that the flow through the warm air small water tank is insufficient and the heat cannot come up.
Third, the engine cooling system has air resistance, which leads to poor circulation of the cooling system, resulting in high water temperature and no warm air. If there is air in the cooling system all the time, it is likely that the cylinder pad is damaged and air leaks into the cooling system. If the inlet pipe of the small heating tank is very hot and the outlet pipe is very cold, this situation should be that the small heating tank is blocked. The small heater water tank should be replaced.
Control panel fault: there are switches for cold air and warm air on the control panel. If the switch is damaged or not in place, it will also affect the heating effect.
Insufficient antifreeze: insufficient antifreeze will also cause the warm air not to be hot, but the water temperature in the car will be very high. The reason why the warm air is not hot is that the warm air water valve is damaged or not fully opened. The warm air water valve is the warm air switch of the automobile heater. The working principle of the automobile heater is that the coolant heated by the engine is pumped into the radiator core of the heater system by the pressure of the water pump, and the heat of the radiator core is sucked into the cab by the blower.
Fault of radiator core: The radiator core is installed in the heating system assembly under the dashboard, and the common fault is that the radiator core is dirty or leaking. Test method 1. Drain the coolant, remove any warm water pipe in the above picture, and check whether there is corrosion inside (the running water is yellow). 2, check whether there is often water under the floor. If the engine is often short of water and the temperature is too high, it proves that the radiator core is leaking.
The troubleshooting steps of automobile heater are as follows: (1) If the speed of the blower is slow or does not turn, check whether the blower motor and speed regulating resistor are damaged, and if so, repair or replace them.
(2) Waterway blockage: Check the drain pipe and replace the radiator if necessary.
(3) The water pipe joint falls off or the water valve fails: connect the fallen nozzle and replace the failed water valve.
(4) The temperature damper can't return normally: Adjust the temperature damper according to regulations, and replace it with a new one if necessary, so that the temperature damper can return normally.