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What does the REST function mean in a car?

1 Answers
MacBradley
07/28/25 7:22pm
REST in a car refers to the residual heat function, which utilizes the engine's residual warmth to continue providing warm air inside the vehicle for up to half an hour after the engine is turned off, after which it automatically shuts off. This function is particularly suitable for short-term parking and engine shutdown in winter, helping to maintain the interior temperature and prevent rapid cooling. When restarting the vehicle, there's no need to turn on the air conditioning system to reheat the interior. Additionally, there are several other buttons in a car: 1. The SEL button is a menu selection confirmation button, usually located on the multifunction steering wheel; 2. The AC button is the compressor switch, which controls the air conditioning cooling; 3. The MUTE button is for instant silencing; 4. The MODE button is for switching between different modes.
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How often should the Haval H6 battery be replaced?

Haval H6 battery should be replaced every 2 to 3 years. The original battery of a new car can last for 3 years before replacement. If the battery has been in use for nearly two years, attention should be paid to its lifespan as it may have expired. At this point, regular checks should be conducted, and early detection should be prioritized to address or replace any issues promptly, avoiding losses caused by sudden battery failure during use. The Haval H6 is a compact SUV equipped with a 1.5T L4 turbocharged engine. Its body dimensions are 4653mm in length, 1886mm in width, and 1730mm in height, with a wheelbase of 2738mm. It delivers a maximum horsepower of 169 PS, a maximum power of 124 kW, a maximum power speed of 3600 rpm, and a maximum torque of 285 Nm.
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Does the BMW X3 have seat ventilation?

20 BMW X3 models do not have seat ventilation across the entire lineup. Here is some extended information about the BMW X3: BMW X3 Model: The BMW X3 is an SUV model with unique personality, introducing the new SUV Sports Activity Vehicle concept, and equipped with BMW's patented xDrive intelligent all-wheel-drive system. Design Style: The BMW X3 combines the distinctive proportions of a Sports Activity Vehicle with classic and innovative design, featuring a fresh and youthful exterior while emphasizing the design characteristics of the BMW brand—robust and powerful. Additionally, the BMW X3's interior can accommodate five people, along with a large amount of luggage or sports equipment, providing more convenience for your travels. Currently, the BMW X3 is the latest model in its series.
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What to Do If the Wrong Fuel is Added to Your Car

Solutions for adding the wrong fuel to your car: 1. If higher-grade fuel is mistakenly replaced with lower-grade fuel, contact a repair shop to clean the fuel tank and fuel system; 2. If gasoline is added instead of diesel, promptly contact a specialized repair shop to clean the fuel tank and fuel system, followed by a comprehensive engine inspection; 3. If diesel is added instead of gasoline, immediately replace the fuel and the engine can continue to be used without special adjustments; 4. If poor-quality fuel is added, the owner should not force-start the engine and should first contact a specialized auto repair shop or 4S store. Whether it's the wrong grade of gasoline or poor-quality gasoline, upon immediate discovery, timely cleaning and replacement are essential. Avoid prolonged use to prevent further damage to the vehicle.
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What to Do When the Vehicle License is About to Expire?

According to the laws and regulations of the traffic management authorities, if the vehicle owner fails to participate in the annual inspection after the vehicle's inspection period expires, the insurance company will not bear the liability for compensation in the event of a traffic accident. According to the provisions of the vehicle insurance contract, the scope of claims only applies to qualified and legal vehicles. For vehicles that have not undergone the annual inspection on time, no claims will be made in the event of a traffic accident. Additionally, if a vehicle that has not undergone the annual inspection on time is lost, the insurance company will also refuse to compensate. According to the "Road Traffic Safety Law," failing to participate in the annual inspection after the vehicle's inspection period expires is considered an illegal act. The driver will be fined 200 yuan for the violation, have 3 points deducted from their driver's license, and have their motor vehicle temporarily impounded.
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Why does the car air conditioner not cool at idle but cools when accelerating?

There are several reasons why a car air conditioner may not cool at idle but cools when accelerating, including a damaged expansion valve, internal wear of the air conditioning compressor, and excessively low idle speed. Below are detailed explanations for each cause: Damaged expansion valve: This prevents the formation of high pressure in the system before the expansion valve, causing the high-pressure refrigerant to fail to reach the required 150Kpa pressure. As a result, the evaporator after the expansion valve cannot cool down, leading to inadequate cooling from the air conditioner. Internal wear of the air conditioning compressor: This results in the pressure between the air conditioning compressor and the expansion valve not reaching the required 150Kpa to 200Kpa, preventing the refrigerant in the system from circulating normally and causing the air conditioner to not cool properly. Excessively low idle speed: The car's onboard computer determines that turning on the air conditioner at this time could cause the engine to stall.
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What are the reasons and solutions for the Passat's air conditioning not cooling?

Passat's air conditioning not cooling reasons include dust on the condenser coil and long-term closure of the internal circulation switch. Below are detailed explanations regarding the Passat's air conditioning not cooling: Dust on the condenser coil: The condenser coil behind the front grille is covered with dust, leading to poor cooling performance. In this case, the owner can resolve the issue by rinsing the dust off the condenser coil with a water hose during car washing. Long-term closure of the internal circulation switch: The internal circulation switch is closed, resulting in reduced cooling efficiency. There is a button on the dashboard with a car icon and a U-shaped arrow next to it, which is the internal circulation switch. If the owner accidentally turns off the internal circulation switch, it means the air conditioning enters external circulation mode, allowing outside air to enter.
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