Browse

Property For Sale Property For Rent

Used Cars Others

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 Others Pet Supplies Sporting Goods Ticket Toys Games Transportation

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

Should the car air conditioner be set to recirculate in summer?

2 Answers

DiJulia

07/29/25 3:43pm

When using the air conditioner in summer, you can first turn on the external circulation to expel the hot air. Once the temperature inside the car has dropped, you can switch to internal circulation. However, for long-distance driving, it is recommended not to use internal circulation but to keep the external circulation on to prevent driver fatigue, as external circulation allows air flow and keeps the air fresh. Precautions for using the air conditioner: 1. Note 1: Do not blow the air conditioner directly at yourself for a long time when using it, as it is not good for your health. 2. Note 2: When using a home air conditioner, remember to open windows regularly for ventilation to avoid stagnant air. 3. Note 3: Clean the air conditioner regularly. If the evaporator needs cleaning, it is advisable to have it done by a professional. 4. Note 4: Avoid blowing the air conditioner directly after intense exercise, as it may lead to catching a cold. 5. Note 5: Air conditioners come in different grades. Pay attention to the energy efficiency ratio when purchasing, and choose the installation method according to your needs. 6. Note 6: If the air conditioner is not working, it is recommended to check after powering off. Avoid disassembling it yourself, as the internal components are quite delicate. It is best to contact after-sales service for repairs.

Was this review help?

20

0

Share

VanEmilia

08/15/25 3:16am

When using air conditioning in the car during summer, should you use recirculation or fresh air mode? Here's how I usually handle it: When you first start the car and it's hot as an oven, definitely use recirculation mode! Close all doors and windows tightly, and let the cold air blast into the cabin - this cools things down twice as fast. But don't keep recirculation mode on the entire time. After about 10-15 minutes when you feel comfortably cool, switch to fresh air mode to ventilate. Otherwise, not only will the windows fog up, but the rising carbon dioxide levels in the car will make you drowsy. Pay special attention on rainy days - don't be lazy and keep recirculation on the whole time. Trapped humidity will cause the windshield to fog up and obstruct your view. I usually watch the thermometer and switch to fresh air mode when the interior reaches about 26°C (79°F), while turning down the fan speed a bit - this saves fuel and keeps things comfortable.

Was this review help?

17

2

Share

Expand All

More Forum Discussions

Can Used Cars Be Transferred Across Regions?

Used cars can be transferred across regions. First, the license plate of the used car determines where the transfer and archival procedures need to be completed. However, before initiating the archival process, it is essential to inquire about the used vehicle admission standards of the destination region. Currently, most areas require the vehicle's emissions to meet the National IV standard, while some regions also have requirements regarding the vehicle's age. The required documents for cross-regional used car transfer are as follows: Documents required from the seller: Original and one copy of the original owner's ID card, original and one copy of the agent's ID card; original and one copy of the vehicle registration certificate; original and one copy of the vehicle license; original and one copy of the original purchase invoice or the last transfer invoice; vehicle purchase tax payment certificate. Documents required from the buyer: One original and three copies of the new owner's ID card, original and one copy of the agent's ID card; Application Form for Vehicle Registration, Transfer, Cancellation/Transfer-In; One original and three copies of the personal passenger car quota certificate (lottery result); If applying for a local license plate with a non-local household registration, a valid temporary residence permit is additionally required.

At What RPM Should You Shift Up?

You can shift up when the RPM is maintained between 1500-2000. For manual transmissions, it's best not to skip gears when shifting up. The proper shifting sequence is from first gear to second, then to third, fourth, and fifth. When shifting up, check whether the engine RPM is sufficient, and drivers can shift based on the sound of the engine. First gear is for starting, with speeds typically ranging from 0-5 km/h; second gear corresponds to speeds of 5-20 km/h; third gear is for 20-40 km/h; fourth gear is for 40-60 km/h; and fifth gear is for 60-100 km/h. Generally, the optimal shift timing is when the engine RPM reaches 2000 rpm, preferably not exceeding 2500 rpm. While shifting gears, the clutch and throttle must be coordinated properly. Press the clutch pedal fully, then release the throttle pedal, and quickly shift to the corresponding gear. After shifting, release your hand immediately—do not keep it on the gear lever (commonly known as the gear stick) for too long, as this may damage it.

Is Mileage Important for Used Cars?

Mileage is very important for used cars as it is closely related to the vehicle's condition. Theoretically, the lower the mileage, the better when buying a used car, but this is not an absolute rule. When comparing vehicles with similar conditions and mileage, you may opt for the one with shorter usage time. If a car has been well-maintained, you might also consider those with longer usage periods. Ultimately, it all depends on the actual condition of the vehicle. Key considerations when choosing a used car: The main factors to consider when purchasing a used car are the model year and mileage. Generally, domestic cars are recommended for replacement within 20 years or under 200,000 kilometers. Older vehicles may require part replacements based on the model year and mileage. Therefore, choosing a high-mileage car could also mean higher maintenance costs. When buying a used car, ensure that the doors open and close properly and that the engine runs smoothly. Check for any sticking or unusual noises when opening and closing the doors. When operating the engine, pay attention to the startup time and any abnormal noises during idle. For used cars, the delivery period may vary depending on the vehicle's condition at the time of sale. If the car is in good condition, the delivery period is often shorter. For vehicles requiring repairs, the delivery period might be longer.

Can Used Cars Be Registered in a Different Location?

Used cars can be registered in a different location. When purchasing a used car in another region, you can either register it locally where the vehicle is located or return to your household registration location for registration. As long as the car purchase is legal and the purchase invoice and relevant vehicle documents are complete, you can proceed with local registration. After purchasing the car, you should register it within the validity period of the temporary license plate, typically within 15-30 days. It is best to complete the registration before the temporary license plate expires. When buying a used car from another region, the seller usually needs to transfer the vehicle records. During this process, the new owner's identification documents must be provided for future registration. The owner must then submit the records to the local vehicle management office for review. Once approved, the car can be registered. Procedures to be completed in the transfer-out location: Suspicious Vehicle Investigation: Primarily verifies whether the engine and chassis numbers have been altered, match the original records, and checks if the vehicle is stolen. Issuance of Used Car Transaction Invoice: For vehicles under customs supervision, the "Notice of Vehicle Border (Exit) License (Cancellation) for Customs Supervised Vehicles of the People's Republic of China" issued by the supervising customs must be submitted. Identity proofs of the transferor and transferee (or their organizations), along with relevant vehicle documents. Collection of the old license plate and issuance of a temporary license plate. The vehicle owner or their agent can receive the vehicle records, which may also be sent via mail.

Can a used car be transferred to another location?

A used car can be transferred to another location. However, without proper transfer procedures, liability may be pursued in case of traffic issues. Methods for transferring a used car: After confirming the purchase of the vehicle, go to the local used car trading market to complete the transaction and obtain a nationally unified used car transaction invoice. After purchasing the vehicle, you need to apply for file extraction at the local vehicle management office. During the file extraction process, you must also provide the identity proof of the new owner. A file extraction fee will be charged, and the price varies by location. Remember to apply for a temporary license plate (valid for 7 days) during the file extraction. Bring relevant documents (including the vehicle file) to the local vehicle management office for review (including vehicle qualifications, theft inquiry, etc.). Once the review is passed, you can proceed with the registration. After passing the review, some cities may require an annual vehicle inspection, which can be completed directly at the testing site. Once the annual inspection is passed, go to the vehicle management office for vehicle inspection, license plate registration, and obtaining a new vehicle license. Vehicle insurance transfer: After completing the vehicle purchase transaction, don’t forget to transfer the vehicle insurance. Some insurance companies can handle the transfer directly, while others cannot. In such cases, you can cancel the existing policy first, purchase temporary insurance, and then reapply for insurance after driving back. After obtaining the vehicle, purchase compulsory traffic insurance and commercial insurance. Precautions for buying a used car: In some cases, file extraction approval may take a few days, so timely arrangements should be made to avoid wasting time. Additionally, the vehicle file bag usually indicates a deadline for registration, typically two weeks or a month. Consumers must complete the relevant procedures within the specified period; otherwise, the file extraction process must be repeated.

What are the disadvantages of multi-point fuel injection?

Multi-point injection has the disadvantage of requiring higher fuel quality, including engine oil; the structure is relatively complex, resulting in higher costs. Multi-point injection has an injector installed at the intake port of each cylinder, controlled by an electronic control unit, which injects fuel individually or in groups into different cylinders. Gasoline is injected in front of the intake port of each cylinder and then enters the cylinder together with air to form a combustible mixture. Multi-point injection is relative to single-point injection. Single-point injection refers to a system where only one nozzle is responsible for injecting fuel into all cylinders. The nozzle is located on the intake pipe before it splits into the intake manifold, and the amount of fuel injected depends on the throttle position. Due to the varying lengths and positions of the intake manifolds, the amount and timing of the fuel mixture injected into each cylinder are inconsistent, leading to differences in the working conditions of each cylinder. The advantage of multi-point injection is that it allows precise fuel injection through the accurate control of the fuel pump by the vehicle's computer, which is why it has replaced carburetors as the preferred tool for automakers to meet strict emission requirements. Additionally, it offers higher combustion efficiency, enabling the same displacement to release greater power. It can also employ sequential injection, allowing more precise control of the air-fuel ratio compared to single-point injection. Therefore, multi-point injection engines have better emissions and are more fuel-efficient.

Trending Ranking

Is It Worth Repairing a Fully Submerged Car?

Does the 2021 Malibu XL Have a Particulate Filter?

What is the difference between 270t and 1.5t?

What are the differences between C1, C2, and C3?

How to Reset the Tire Pressure Warning Light on a Volkswagen?

How to Open the Door and Exit a Ferrari?

How to Adjust the Headlight Height on a Ford Focus?

How to Fix a Flooded Engine?

What is the maximum wading depth of the Bora?

More Forum Discussions

Where to Adjust the Driver's Seat Height?

What Causes the Malfunction of Steering Wheel Sound Control Buttons?

What Are the Reasons Why a Mechanical Key Can Be Turned but Cannot Open the Car Door?

How Long Can an Engine Last After a Major Overhaul?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.