What should I do if the Mazda 3 heater is not hot?

1. Cause of failure: The thermostat is always open or opened too early, causing the cooling system to undergo a large cycle prematurely, while the external temperature is very low, especially when the car is driving, the cold air will cool down rapidly. Antifreeze, the engine water temperature will not come up, and the warm air will not be very hot.

Solution: In this case, do not open the thermostat too early.

2. Cause of failure: The water pump impeller is damaged or lost, resulting in insufficient flow through the small heater water tank and no heat.

Solution: Repair the water pump impeller or replace it directly.

3. Cause of failure: There is air resistance in the engine cooling system, resulting in poor circulation of the cooling system, resulting in high water temperature and insufficient heating. If there is always air in the cooling system, the head gasket may be damaged and air is flowing into the cooling system.

Solution: The small heater water tank should be replaced or the engine cooling system should be repaired.

Extended information:

Notes on Mazda 3 heater:

1. Open windows for ventilation.

Although the outdoor temperature is relatively low in winter, it is best to leave a small gap in the window while turning on the heater in the car. This can reduce formaldehyde and toluene in the car by enhancing air circulation. , carbon monoxide and other harmful gases.

2. Turn on the external circulation mode appropriately.

If the internal circulation mode is turned on for a long time with the heater turned on, it will be very detrimental to the circulation of air in the car. Therefore, when driving on the road in winter, as long as you are not on a congested road section, you should turn on the external circulation mode as much as possible to promote the circulation of air in the car.