Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

What is the difference between the internal circulation and external circulation in a car?

1 Answers

LaRyder

07/29/25 6:39pm

The differences between the internal circulation and external circulation in a car are: 1. Different meanings: Internal circulation refers to the air inside the car being heated or cooled before being recirculated back into the car; External circulation refers to drawing air from outside the car, heating or cooling it, and then sending it into the car, which means gas exchange between the inside and outside of the car. 2. Different uses: Internal circulation is used in urban roads with heavy traffic congestion; External circulation is used during high-speed driving when it is inconvenient to open the windows for ventilation. The external circulation mode uses a fan to draw air from outside the car into the interior, meaning the air passage between the outside and inside of the car is open. The air blown by the fan comes from outside the car, and even if the fan is not turned on, airflow is still drawn into the car while driving, replenishing fresh air inside the car.

Was this review help?

20

5

Share

More Forum Discussions

Do You Need to Turn on the Width Indicator Lights When Driving at Night?

When driving at night, not only do you need to turn on the width indicator lights, but you should also turn on the car's headlights. Here is some relevant information about width indicator lights: 1. Definition: When the light switch is turned to the first position, the small lights that illuminate at the front and rear are the width indicator lights (also known as evening running lights, which are turned on when it is not completely dark; the next position after width indicator lights is the low beam, while the high beam refers to the main headlights). 2. Purpose: They indicate the width of the car to alert other vehicles in front and behind. Width indicator lights are used during evening driving to make the car visible to other vehicles. Their primary function is to signal the presence and approximate width of the car to other drivers, both ahead and behind.

Can a 5-seater car accommodate 4 adults and 2 children?

A 5-seater car cannot accommodate 4 adults and 2 children as this would constitute overloading. Here is some information about overloading: 1. Legal Basis: According to the "Road Traffic Safety Law of the People's Republic of China," if a passenger vehicle carries more passengers than its rated capacity, a fine ranging from 200 to 500 yuan will be imposed, and 3 penalty points will be deducted. If the number of passengers exceeds 20% of the rated capacity or if the vehicle carries cargo in violation of regulations, a fine ranging from 500 to 2,000 yuan will be imposed, and 6 penalty points will be deducted. 2. Explanation: Both adults and children are considered independent individuals, so they are all counted as part of the overloading. Overloading can easily lead to traffic accidents. In the event of an accident, if overloading is involved, the driver will not only be held responsible but may also face issues with subsequent insurance claims.

How to Open the Cover of a Maintenance-Free Battery?

There are no tricks; brute force is required. Here is some relevant information about the battery: 1. Cold Cranking Amps (CCA): The minimum current obtainable under specific conditions at -17.8°C and -28.9°C. This metric links the battery's starting capability with variables such as engine displacement, compression ratio, temperature, cranking time, the technical state of the engine and electrical system, and the minimum operating voltage for starting and ignition. Specifically, it refers to the minimum current a fully charged 12V battery can supply within 30 seconds while its terminal voltage drops to 72V. The CCA rating provides the total current value. 2. Reserve Capacity: The approximate time a vehicle can operate at night using the battery for ignition and providing minimal circuit load when the charging system is inactive. It is defined as the discharge time of a fully charged 12V battery at 25°C, discharging at a constant current of 25A until the terminal voltage drops to 10.5V.

Should You Look at Horsepower or Torque for Hill Climbing?

The hill-climbing capability of a car mainly depends on torque and the RPM at which peak torque is achieved. The lower the RPM at which peak torque is reached and the higher the torque value, the better the hill-climbing performance and the greater the initial acceleration G-value. A car's hill-climbing ability is evaluated by its maximum climbable gradient, which refers to the steepest slope it can overcome in first gear on a good road surface when fully loaded. The maximum climbable gradient represents the vehicle's hill-climbing capacity and is one of the indicators used to evaluate a car's dynamic performance. Below are the factors that influence the maximum climbable gradient: 1. Torque: Torque ensures the engine doesn't stall during climbing and is related to engine power and load conditions (empty or fully loaded). 2. Friction: Friction prevents slipping while ascending the slope.

What stickers are required on car windows?

There are three types of stickers required on car windows: the annual inspection sticker, the environmental protection sticker, and the compulsory traffic insurance sticker. Here is relevant information about the compulsory traffic insurance sticker: 1. Sticker is no longer mandatory: It should be noted that before the cancellation of the compulsory traffic insurance sticker, the environmental protection sticker for vehicles had already been abolished, and the annual inspection sticker has also been digitized. Therefore, it is no longer mandatory for vehicle owners to display stickers on their vehicles. 2. Digitalization trend: Digitalization is a major trend, which not only reduces costs, saves resources, and eliminates the hassle of tearing off/attaching stickers for vehicle owners, but also does not obstruct the driver's view, ensuring driving safety. Additionally, it can improve work efficiency to some extent, making it a win-win situation.

How to Deal with Engine Carbon Deposits?

Engine carbon deposit cleaning methods are as follows: First, use a carburetor cleaner to clean the throttle valve. Then, open the oil cap, pour the entire can of cleaner in, close the oil cap, and idle the engine for 10 minutes before shutting it off. Finally, pour the intake system cleaner into the liquid storage tank of a dedicated cleaning device, connect it to the intake system, and start the engine to use vacuum to draw the cleaner into the intake pipeline for cleaning purposes. Here are some relevant information about carbon deposits: 1. Definition: Carbon deposits refer to sludge-like colloidal substances produced when fuel and oil vapor that leaks into the combustion chamber cannot be completely burned. These deposits accumulate over time and, under the repeated high temperatures of the engine, eventually form carbon-like substances. They can be found on components such as intake and exhaust valves, spark plugs, fuel injectors, and the top of pistons. 2. Types of Carbon Deposits: Carbon deposits can be categorized into valve and combustion chamber deposits and intake pipe deposits.

Trending Ranking

How to reset the tire pressure warning on a Volkswagen?

What are the common charging methods for batteries?

How to remove the rearview mirror of Haval H7?

What engine does the Roewe RX5 use?

Should You Press the Brake or Clutch First When Decelerating?

What are the practical techniques for reverse parking?

How to Tell if a Car Meets China 6 Emission Standards?

How to Replace the Battery in a Citroën Key

What is the difference between Jin Chaowei and Chaowei Black Gold batteries?

What documents are required for licensing a parallel-imported vehicle?

More Forum Discussions

How many kilometers does a car typically run in a year?

What causes the electric current noise when stepping on the accelerator?

When is the best time for the first maintenance of a new car?

Is there traffic restriction in Shenzhen on weekends?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.