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Do You Need to Turn on AC When Using Car Heater?

2 Answers
DeJordan
07/29/25 1:08am
You do not need to turn on AC when using car heater. More information about AC is as follows: 1. The car AC switch, simply put, is the air conditioning cooling switch. AC stands for "Air-conditioning", meaning air conditioning device. This button controls the compressor's on/off function, and car air conditioning relies on compressor operation for cooling. 2. The main function of car AC switch is to adjust and control the temperature, humidity, air cleanliness and airflow inside the car compartment to optimal conditions. 3. When the car AC light is on, it indicates the air conditioning compressor is activated, increasing engine load and fuel consumption.
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DeVictoria
08/12/25 5:18am
As a veteran driver with over 20 years of experience, I never turn on the AC when using the heater. The heating system utilizes engine heat to warm the cabin air - essentially, the fan blows air through the hot coolant heat exchanger, producing warm air naturally and eco-friendly. The AC compressor is mainly for summer cooling. Engaging it consumes fuel, increasing fuel consumption by about 10% unnecessarily. Many novice drivers mistakenly believe AC speeds up heating, but since the heat sources are different, it provides no benefit. The only time to use AC is during severe windshield fogging - activate its dehumidification function combined with defrost mode for quick defogging, then turn it off immediately after clearing. For daily heating, simply rotate the temperature knob to high and adjust fan speed for sufficient warmth and fuel efficiency. I also remind everyone to check coolant levels and heater core annually to ensure proper heating system operation, ensuring safety and prolonging component lifespan. Remember, engine waste heat is a free resource - using it wisely is smart wealth management.
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More Forum Discussions

What are the effects of not changing the transmission oil for 200,000 kilometers in a Lavida?

The effects of not changing the transmission oil for 200,000 kilometers in a Lavida are as follows: Impact on clutch plate engagement: If the transmission oil is not replaced for a long time, metal shavings inside the transmission will accumulate. When they reach a certain level, they will affect the physical properties of the transmission oil, thereby impacting the engagement of the clutch plates and the operation of the gears. This leads to a significant reduction in clutch pressure and increased metal wear between the gears. Severe power loss: The eventual result is a severe drop in power, to the point where the car may not move even in D gear. At this stage, the drained transmission oil will contain a large amount of metal shavings. Transmission overheating: Besides lubrication, transmission oil also cools the transmission. Prolonged use of old oil will cause the transmission to overheat continuously. This heat further weakens the viscosity and lubricity of the transmission oil, creating additional friction. Components such as O-rings, gaskets, rubber seals, and other sealing parts in automatic transmissions may also deform or melt due to overheating.
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Does the Lavida belong to FAW-Volkswagen or SAIC Volkswagen?

Lavida is independently developed by SAIC Volkswagen, so Lavida belongs to SAIC Volkswagen. The following are the differences between SAIC Volkswagen and FAW-Volkswagen: Product positioning: SAIC Volkswagen's car models are mainly positioned as mid-to-high-end vehicles, with well-known models such as Lavida and Passat, and their prices are naturally higher than those of FAW-Volkswagen. FAW-Volkswagen, on the other hand, focuses on mid-to-low-end vehicles, with popular models such as Jetta and Bora. Therefore, in terms of positioning, there are certain differences between the two. Different influence in the domestic market: SAIC Volkswagen was established in 1984, earlier than FAW-Volkswagen in 1991, which means SAIC Volkswagen entered the domestic market earlier. As a result, SAIC Volkswagen has left a deeper impression on Chinese consumers and has a better understanding of their needs compared to FAW-Volkswagen, so its influence in the domestic market is also higher than that of FAW-Volkswagen.
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Is the Lavida door leakage related to the door frame sealing strip?

Is the Lavida door leakage related to the door frame sealing strip? The reasons for Volkswagen Lavida door leakage are as follows: Door disassembly: If the door has been disassembled, it can easily cause water leakage. You can check whether the drainage holes of the sunroof and the door are blocked. In the case of door disassembly, the waterproof plastic sheet can be replaced. Check the door sealing strip: Inspect whether the door sealing strip is aged or cracked, as poor sealing can also lead to water infiltration from the outside. Check for blockages in the sunroof and door: Examine whether the drainage holes of the sunroof and door are blocked. You can use a disposable chopstick, break it, and use the pointed end to poke the drainage holes at the bottom of the door to clear any blockages. Internal leakage may also be caused by the air conditioning drainage entering the car. Air conditioning drainage issues mainly occur when the drainage outlet is blocked, preventing water from flowing out of the car, causing it to overflow from the gaps in the evaporator box into the car. For such cases, the owner must go to a repair shop to have the maintenance personnel conduct fault detection and troubleshooting.
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What is the air conditioning operation manual for the older BMW 5 Series?

The air conditioning operation manual for the older BMW 5 Series is as follows: A/C button: Press the A/C button to activate the BMW 5 Series air conditioning system, and the indicator light on the button will illuminate. Press this button again to turn off the indicator light and shut down the compressor. External circulation: After activating the external circulation in the BMW 5 Series, the air intake located at the firewall will be opened by the air conditioning computer. The vehicle's blower will draw outside air through the microfiber filter into the two heat exchangers (cooling and heating) inside the evaporator. The air processed by the heat exchangers will then be blown out through the air vents. When the vehicle's air conditioning system is in external circulation mode, the air intake is open, connecting the air inside and outside the vehicle. For example, when encountering traffic congestion in the city, you can activate the external circulation. Internal circulation: In the BMW 5 Series, the internal circulation mode closes the airflow passage between the inside and outside of the vehicle. Without the blower, there is no airflow circulation. When the blower is on, the airflow drawn in comes solely from inside the vehicle, creating an internal airflow cycle.
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How much can a 50-liter fuel tank of the Langdong actually hold?

It is possible to fill a 50-liter fuel tank with 53 or even 55 liters of gasoline. Additionally, you cannot rely on the fuel gauge on the car dashboard to determine the exact amount, as it is not a precise measuring instrument—it provides a qualitative indication rather than a quantitative reflection of the fuel level in the tank. Furthermore, you should not judge based on the relationship between the amount of fuel added and the distance traveled. More relevant details are as follows: Safety Capacity: Most fuel tanks are labeled with a safety capacity, which is generally about 10% less than the actual capacity. This is because, during design, the tank accounts for the thermal expansion and contraction of fuel. To ensure driving safety, a certain amount of space must remain in the tank after filling to the rated volume to prevent excessive internal pressure. Overfilling can damage the carbon canister, while underfilling leaves too much empty space, causing fuel to evaporate and be lost as vapor. Important Notes: The car fuel gauge is not a precise measuring instrument—it only provides a qualitative indication and cannot quantitatively reflect the fuel level in the tank. Also, avoid judging based on the relationship between the amount of fuel added and the distance traveled, as road conditions, speed, traffic congestion, air conditioning usage, vehicle load, fuel leaks, and fuel quality can all directly affect fuel consumption.
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Does Having a Child in the Car Count as Overloading?

If the number of passengers exceeds the vehicle's rated capacity, having a child in the car is considered overloading. Here is relevant information about overloading: 1. The "Road Traffic Safety Law of the People's Republic of China" stipulates that for passenger vehicles exceeding the rated number of passengers, a fine ranging from 200 to 500 yuan will be imposed. If the number of passengers exceeds 20% of the rated capacity or if goods are carried in violation of regulations, a fine ranging from 500 to 2,000 yuan will be imposed. For freight vehicles exceeding the rated load capacity, a fine ranging from 200 to 500 yuan will be imposed. If the load exceeds 30% of the rated capacity or if passengers are carried in violation of regulations, a fine ranging from 500 to 2,000 yuan will be imposed. 2. For a five-seat private car, exceeding the rated number of passengers will be treated as a 20% overload. Traffic police authorities will impose a penalty of deducting 6 points from the driver's license. According to the new traffic regulations, for passenger vehicles other than school buses and commercial vehicles, overloading by no more than 20% will result in a deduction of 3 points from the driver's license, while overloading by more than 20% will result in a deduction of 6 points.
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