If the car heater is not hot, you can check the hot and cold air switch, check the blower switch, and check the thermostat. The inspection method is as follows:
Check whether the hot and cold air switch is in the red position.
Check whether the hot and cold air switch is in the red position. Red represents hot air. If it cannot be turned to the red position, , then further check the heater main switch.
Check the quality of the blower switch:
The heating of most cars is supplied by the cooling system, and no additional electrical equipment is needed. The blower switch is the only electrical equipment to control the heating. If the switch is faulty, the blower cannot be turned on, resulting in no hot air blowing out and the car heater not being hot.
Check the quality of the thermostat:
If the car does not have a thermostat or it is always on, the water temperature in the car will rise slowly and the heating switch cannot be turned on. In this case You can go to a repair shop for maintenance.
First of all, if the heater is not hot, car owners can check it themselves. The steps are very simple. The first step is to check the water temperature. Only when the water temperature is normal will warm air be generated, because the heat of the warm air comes from the coolant. After the blower blows the cold air from the outside through the water tank, the air is heated and blown into the car. The wind is the warm wind. To check the water temperature, just look at the water temperature meter. Generally, the normal water temperature is about 90 degrees. If you see that the water temperature is only about 50 degrees, it means there is something wrong.
In this case, there is usually a problem with the thermostat. When checking, you can compare the temperatures of the upper and lower water pipes. First ignite the engine and let it rotate to the left for a while. If the temperature of the upper and lower water pipes is basically the same and the water pipe is a little hot, it means that the thermostat is indeed broken. If there is no problem with the thermostat, then before the thermostat is turned on, the upper water pipe is hot but the lower water pipe is cold. In addition, there is another way to check. When the car is ignited in a cold state, you can immediately check whether there is coolant flowing in the upper and lower pipes of the water tank. If there is, it means the thermostat is damaged. In this case, just replace the thermostat with a new one and warm air can blow out normally.
In addition, if the water temperature is normal but the warm air blowing out is still not hot, you can first check whether the amount of coolant is sufficient. We know that if there is insufficient coolant, the amount of coolant entering the heater water tank will be reduced, and some may not even enter the heater water tank for circulation. Therefore, if you find that the coolant is indeed insufficient, just replenish it in time.
If there is sufficient coolant, you can check whether the heater water tank is blocked and check the temperature of the inlet and outlet pipes. If the temperature of the water inlet pipe is higher than that of the water pipe, it means that the heater water tank is indeed blocked, preventing the coolant from entering the water tank. It only needs to be cleared in time.
Of course, there is another situation where the water temperature is normal and the warm air is not very hot. At this time, we need to pay attention to two reasons. The first thing is to see if the air conditioning filter element is too dirty. If it is too dirty, it will reduce the amount of warm air blown into the car. Secondly, check whether the heater is not adjusted correctly, especially for manual air conditioners. Make sure that the adjustment knob is in the red area. The thicker the red line, the higher the temperature will be.
Another thing to note is that you must grasp the timing of turning on the heater. Don't turn it on as soon as you get in the car. This is of no use. You can only turn it on after the water temperature comes up, and the warm air will be blown out. wind. Sometimes, the way you turn on the heater is wrong, causing the blown air to be cold. If you mistakenly think that the heater system is faulty, it will be a joke.
The lack of hot air in the car's heater is mostly caused by a lack of coolant or too many impurities in the coolant, or blocked pipes. I once encountered a car where water was mixed into the coolant, resulting in The heater water tank is clogged. Therefore, we remember to check the coolant level during maintenance, replenish it quickly if it is missing, and replace it when it is time to replace it. Don't think that coolant needs to be replaced for life.