What is the reason why car heating is not hot?

There are two reasons why car heating is not hot: one is caused by the engine cooling system, and the other is caused by poor operation of the heating control mechanism. When repairing, it is necessary to first determine which aspect is causing the problem, and then carry out corresponding repairs.

The method of discrimination is very simple. Take a look at the temperature of the two inlet pipes of the heating small water tank. If both pipes are hot enough, it indicates a problem with the air volume control mechanism. Conversely, if both pipes are cold, or if one is hot and the other is cold, it indicates a problem with the cooling system.

The reason why the car's warm air is not hot: cooling system problems. The possible problems of the cooling system are: first, the thermostat is normally opened or opened too early, which makes the cooling system carry out systemic circulation too early, while the external temperature is very low. Especially when the car is running, the cold air quickly cools the antifreeze, the engine water temperature cannot rise, and the warm air will not be hot.

2、 It is the damage or loss of rotation of the water pump impeller that causes insufficient flow through the small warm air tank and prevents heat from flowing.

3、 Control panel malfunction. There is a cold air and warm air conversion switch on the control panel. If the switch is damaged or not properly converted, it can also affect the heating effect.

4、 Lack of antifreeze. A lack of antifreeze can also cause the warm air to not be hot, but the car's water temperature can be very high. The reason for the warm air to not be hot in a car is that the warm air valve is damaged or not fully opened. The warm air valve is the heating switch of the car's warm air fan. The working principle of a car heater is to heat the engine with coolant, which is pumped into the radiator core of the heating system through water pump pressure, and the heat from the radiator core is sucked into the driver's cab through a blower.

5、 Radiator core failure. The radiator core is installed in the heating system assembly below the dashboard, and common faults include dirty or leaking radiator core. Inspection method: 1. Drain the coolant, remove any heating water pipe, and check if there is any rust inside (the water flowing out is yellow). 2. Check for frequent accumulation of water under the floor. If the engine frequently runs out of water and the temperature is too high, it indicates that there is a leakage fault in the radiator core.