Which is for hot air and which is for cold air between HI and LO in cars?
3 Answers
Car air conditioning modes are divided into cooling and heating, generally using red or HI to indicate the heating function, and blue or LO to indicate the cooling button. LO stands for 'low' in English, and HI stands for 'high' in English. To heat the car's air conditioning, you need to adjust the knob's arrow to the red or HI area. Before heating, it is essential to preheat the engine first. Once the engine temperature rises, adjust the air conditioning temperature button to the red or HI area, and warm air will blow out from the vents. The heating function does not require turning on the AC button; the AC button is used to activate the cooling function. Additionally, when using the heating function, it is best to set the air circulation mode to internal circulation, as this helps the interior temperature rise quickly. The LO setting for seat heating does not indicate cold air but refers to the lowest level of seat heating. Seat heating uses electric heating wires inside the seat to warm it up, transferring heat to the occupant. HI for seat heating means high-level heating. Precautions for using heated seats: The seat heating function only works when the ignition switch is on. To protect the heating components of the seat heating system, avoid kneeling on the seat or applying point loads to the seat surface and backrest. If the vehicle's voltage drops, the seat heating function will automatically turn off to ensure sufficient power supply to the engine control system. Turn off seat heating or ventilation promptly after parking to prevent excessive electrical load during the next startup. Avoid placing overly thick seat cushions on heated seats to prevent overheating or abnormal low temperatures, which may cause malfunctions. Turning on the seat heating switch after starting the engine can effectively save battery energy and extend battery life.
Having driven for over ten years, I often get asked about air conditioning issues. Actually, 'hi' and 'lo' have nothing to do with hot or cold air; they are abbreviations for controlling the fan speed. 'Hi' stands for high, meaning strong airflow, while 'lo' stands for low, indicating weak airflow. The real control for hot or cold air is the knob with red and blue colors. Turning it towards the red zone blows hot air, and turning it towards the blue zone blows cold air. The air conditioning system requires the compressor to work for cooling and the heater to function for heating, which has nothing to do with the fan speed. To stay cool in summer, turn the temperature knob to the blue zone and set a high fan speed. For warmth in winter, adjust it to the red zone with a low fan speed to save fuel. Operating it wrong might just waste some fuel but won't cause any safety hazards.
Last time when I got my car repaired, the veteran mechanic taught me that the car air conditioning control system is actually quite simple. 'Hi' and 'Lo' are just blower speed settings - 'Hi' is equivalent to turning an electric fan to maximum speed, while 'Lo' is like a gentle breeze. The key to determining hot or cold air lies in the temperature control switch, usually a rotary dial design with prominent red and blue markings. The red zone activates the heater core circulation for warm air, while the blue zone starts the cooling system for cold air. For older cars, remember to press the AC button for cooling - just turning on the fan won't produce cold air. Different car models have slight operational differences. Japanese cars tend to make temperature scales very visible, while German cars prefer digital displays. Just remember red means hot and blue means cold, and you won't go wrong.
