Volkswagen sagitar has no warm air. Why?

Pacific Auto Network 1, the thermostat is always open or the thermostat is opened too early, which makes the refrigeration system carry out a large cycle too early and the external temperature is very low; 2. The water pump impeller is damaged or lost, so that the flow through the warm air small water tank is not enough, and the heat does not come up; 3. There is air resistance in the engine cooling system, which leads to poor circulation of the cooling system; 4. The filter screen is dirty and blocked, which leads to insufficient air volume or poor distribution of hot and cold air, so that the heat of the warm air small water tank cannot be radiated.

The reason why cars don't have warm air is:

1, heater box blocked. After the heater tank is blocked, the coolant flow rate in the heater tank will slow down, and the flow rate will also decrease. Due to insufficient heating, the air conditioner heater will naturally not be hot.

2, thermostat failure, the water temperature will be low for a long time, has been unable to get up heating.

The warm water valve is out of order. After the warm water valve is broken, there is no coolant flowing to the warm water tank, so there is no warm air.

1. The heater water tank is blocked. There are many tiny radiating pipes in the internal structure of the car's warm air water tank, which is easy to be blocked inside. Scaling, impurities, flocs and deposits in the coolant may cause blockage. After the heater tank is blocked, the flow rate of the coolant in the heater tank will slow down, and the flow rate will also decrease. Due to insufficient heating, the air conditioner heater will naturally not be hot.

There is something wrong with the thermostat. The thermostat often doesn't open, and the coolant circulates from the idle speed of the engine. If the vehicle is used in winter in the north, the water temperature will be low for a long time, and the air conditioning heater will naturally not be hot. As can be seen from the thermometer, the pointer is obviously lower than the normal scale.

2, warm water valve failure. After the hot water valve fails, the opening of the electronic control valve is no longer controlled by the computer, and it is in the state of normally open, normally closed or fixed position. At this time, there is no coolant flowing through the warm water tank or the flow rate is uncontrolled, so the warm air temperature of the air conditioner is naturally uncontrolled. The warm water valve is actually an electric control valve. The warm water valve is installed between the water inlet pipe of the warm water tank and the small circulating pipeline of the engine, and the opening of the valve is controlled by the air-conditioning computer, so as to control the flow rate of coolant entering the warm water tank and achieve the purpose of controlling the warm air temperature of the air conditioner more accurately.