Why is the Haval H5 heater not hot?

Causes and solutions for the warm air not being hot:

1. Lack of coolant

Cause: It is due to damage to parts of the engine water circulation system and leakage of interfaces Or the cylinder gasket is worn, etc., resulting in insufficient coolant, so that only a small amount of coolant circulates in the warm air duct or does not circulate at all, causing the warm air to not be hot.

Solution: Make sure the engine water circulation system is normal and replenish the coolant. If there are other problems, fix them first and then add coolant to the normal level.

2. Thermostat

Reason: The thermostat was removed and not installed due to high water temperature during previous maintenance, or the thermostat was damaged and was in the normally open position, thus causing the engine water to circulate. It is always in a large circulation, and the low outside temperature and good heat dissipation make it difficult for the engine water temperature to rise, so the warm air is not hot.

Solution: Install or replace a new thermostat.

3. Heater water tank and heat exchanger

Reason: Some models have an exhaust port near the heater water tank. If the exhaust is incomplete, the heater will not be hot.

Solution: Exhaust the one with the exhaust port first. If it doesn't work, feel the two heating water pipes with your hands. If the temperature difference is large, just use a water gun or air gun to ventilate the heating water tank or heat exchanger. .

4. Heater control mechanism

Reason: The heater cannot be used normally due to damage to the air conditioning panel, hot and cold servo motor, heater water valve and other parts or circuit failure of the heater system.

Solution: Find out the cause and treat specific problems in detail.

Extended information:

Causes of air conditioner damage:

1. The heater water tank is clogged

The heater water tank is clogged and the heater is not functioning properly. Possible cause of heat. The structure of the heater water tank is actually a reduced version of the engine water tank radiator. There are many small heat dissipation pipes inside, which are easy to get clogged inside like the water tank radiator. When the inside of the heater water tank is clogged, the coolant flowing through becomes slower, the flow becomes smaller, the heat is insufficient, and the air conditioner warm air is naturally not hot. Just clean the inside of the heater water tank and the inside of the water tank radiator.

2. Warm water valve failure

The warm water valve is actually an electronically controlled valve. It is installed between the water inlet pipe of the heater water tank and the small circulation pipe of the engine. It is controlled by the air-conditioning computer. Control the opening of the valve to control the flow of coolant into the heater water tank to achieve more precise control of the air conditioner heater temperature.

After the heating water valve fails, the opening of the electronically controlled valve is no longer controlled by the computer and is in a normally open, normally closed or fixed position. At this time, no coolant flows through the warm air water tank or The flow rate is not controlled, and the temperature of the air conditioning warm air is naturally not controlled.

3. The thermostat is always open

If the thermostat is always open, it will also cause the warm air to not heat up. After the thermostat is normally open, the coolant circulates widely from the engine idling. If the water temperature is low for a long time in the northern winter, the air conditioning warm air will naturally not be hot. It can also be clearly seen from the water temperature gauge that the needle is significantly lower than the normal scale. In addition, if the engine water temperature is low for a long time, it will lead to excessive fuel consumption, increased wear and tear, and the engine is not working at the optimal temperature. If the water temperature is low for a long time, it requires immediate maintenance and inspection.

4. Insufficient antifreeze

Lack of antifreeze in the cooling system is the most common reason why the heater is not hot. When designing the engine cooling system, engineers will give priority to engine heat dissipation, and then the normal operation of the heater.

When the coolant is insufficient, the coolant will be given priority to circulate in the engine. At this time, there is no "water" in the heater circulation pipe, and most of the heater water tank is air. At this time, the air conditioner Warm air is naturally not hot. After replenishing the antifreeze, the heater water tank is filled with hot coolant, and the heater will naturally heat up.

Ifeng.com-Car air conditioner heater fails in winter? It turns out they are the culprit