Do You Need to Press AC for Car Air Conditioning in Winter?

[SanKathryn]

In winter, you do not need to press AC for the car air conditioning. The correct way to use the car air conditioning in winter is: 1. Start the engine for preheating and wait until the engine temperature gauge reaches the middle; 2. Turn on the heating air conditioning and set the air circulation to external circulation to expel the cold air inside the car; 3. After 2 to 3 minutes, switch the air circulation to internal circulation. The car air conditioning is an air conditioning device installed in the vehicle, and its functions include: 1. Cooling, heating, ventilating, and purifying the air inside the cabin; 2. Providing a comfortable environment for passengers; 3. Reducing driver fatigue and improving driving safety.

[EstherFitz]

I've been driving a taxi for fifteen years and never press the AC button in winter. That's the air conditioning compressor button, which only works for cooling and wastes fuel if turned on. Winter heating relies on engine heat—just wait for the dashboard water temperature needle to reach the middle position, then turn on the fan and adjust it to the red temperature zone for warmth. If the windshield fogs up, briefly pressing AC can dehumidify and defog, but remember to turn off the compressor button immediately after the fog clears. Keeping the compressor on for too long may wear out parts and cause temperature control issues. Remember, the heating function itself is free—don’t let the AC button needlessly burn your gas money.

[LeGianna]

I used to be confused about whether to press the AC button in winter until I learned the principle of this function during my auto repair studies. The air conditioning compressor is specifically for cooling, and pressing it consumes more fuel. In winter, the heating actually relies on the heat converted from the engine coolant. Once the water temperature rises, simply turn the temperature knob to set the desired temperature—there's no need to turn on the AC. Only when the windows fog up severely should you turn on the compressor to quickly dehumidify and defog. But under normal circumstances, avoid pressing it, as it not only costs more but also accelerates system wear. Winter driving requires some practical techniques.

[McMichael]

As an average car owner, I never touch the AC button in winter. The heating directly utilizes the engine's residual heat—once the coolant warms up, activating the fan delivers warm air. If the windshield fogs up on snowy days, briefly press the AC button for dehumidification to clear the fog, then turn it off immediately. Otherwise, keeping the compressor running wastes fuel and may even reduce heating efficiency. My advice is to focus more on air circulation inside the car: using the fresh air mode (external circulation) in winter with some outside air intake can minimize fogging and reduce reliance on AC dehumidification.

[McKathryn]

When I first started driving, I often confused the purpose of the AC button. Now I understand that it's basically unnecessary to press it in winter. The compressor is a cooling component, and the heating function doesn't involve cooling, so simply adjusting the temperature knob and fan speed is sufficient. However, if the windows fog up and obstruct visibility, pressing the AC button to activate the dehumidification mode can be very effective—just remember to turn off the compressor once the fog clears. Keeping the AC on for extended periods increases fuel consumption and places additional strain on components. In winter, the heating system is designed to utilize excess heat, so avoid unnecessary operations that might interfere with the normal supply of warm air.

[LandonLynn]

I used to be confused about the AC button every time I turned on the heater. Later, I found out it's only useful for defrosting. Running the air conditioning compressor in winter is purely a waste of gasoline, as the heater relies on the engine's own heat. So daily operation is simple: after the water temperature rises, turn up the temperature knob and turn on the fan. The only exception is turning on the AC for dehumidification when there's heavy fog, then turning it off after a few minutes. This maintenance method saves fuel and protects parts. Every time I refuel, I save at least a few dozen yuan, and the car stays warm and comfortable all winter without worrying about operation issues.