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

Should You Use Recirculated Air or Fresh Air When Running the AC?

1 Answers

GeorgeLynn

07/29/25 1:08pm

Whether to use recirculated air or fresh air when running the AC depends on actual conditions such as road conditions, vehicle condition, air quality, and season. Road conditions: On highways, use fresh air. Due to wind resistance and high speed, it's not suitable to open windows on highways. If recirculated air is used for a long time, it can lead to brain hypoxia, affecting reaction and judgment, which is very dangerous. Additionally, air quality on highways is generally good, with low exhaust concentration, so fresh air can be chosen. In cities, especially during crowded sections or rush hours, where exhaust concentration is high, recirculated air is recommended. Vehicle condition: New cars usually contain high concentrations of toxic gases like formaldehyde. Therefore, for the first three to six months after buying a new car, it's advisable to use fresh air along with opening windows to enhance air circulation and dilute the toxic gas concentration inside the car. Air quality: If the air quality is poor, it's better to use recirculated air. Season: In summer, when the AC is on, recirculated air is recommended because using fresh air allows hot outdoor air to enter, forcing the AC to work continuously in cooling mode with poor efficiency. In winter, if the heater is on, switch to fresh air to avoid dizziness and chest tightness.

Was this review help?

5

2

Share

More Forum Discussions

What is the maximum speed allowed for a vehicle during the break-in period?

The maximum speed for a new car during the break-in period is 70-80 km/h. Generally, during the break-in period, the engine speed should be controlled between 2000~4000 rpm, and high speeds and long-distance driving should be avoided. Therefore, it is not advisable to maintain a speed above 60 km/h for an extended period during the break-in period. After the total mileage reaches 500 km, the speed can be slightly increased. Precautions for the break-in period of a new car: 1. The break-in mileage for most vehicles is generally 1000-2500 km. The first 500 km is the initial break-in period, during which the speed should not be too fast, generally below 70-80 km/h, and the engine speed should not exceed 2200 rpm. The next 500-1000 km is the mid-term break-in period, during which the maximum speed can be appropriately increased, generally up to 90-100 km/h, with the engine speed still preferably below 2500 rpm. The final 1000-1500 km is the late break-in period, during which the speed can be increased to below 120 km/h. Since the break-in is a gradual process, it must be done step by step. The engine speed should not exceed 3000 rpm. 2. During the break-in period, it is best not to exceed 75% to 90% of the rated load capacity of the new car. Therefore, heavy loads should not be carried, and driving on poor road surfaces should be avoided to minimize significant bumps and reduce the vehicle's load.

Can the BYD Han be charged with a household 220v power supply?

The BYD Han can be charged with a household 220v power supply, but the charging speed is relatively slow. More details about the BYD Han are as follows: 1. The BYD Han is a mid-to-large-sized car under the BYD brand. The dimensions of this car are 4960*1910mm*1495mm, with a wheelbase of 2920mm. 2. The BYD Han is available in pure electric and hybrid versions. The hybrid version uses a 2.0-liter turbocharged four-cylinder engine with a maximum power of 141kW and a maximum torque of 320 Nm. This engine features direct fuel injection technology and uses an aluminum alloy cylinder head and block. It is paired with a 6-speed dual-clutch transmission. The hybrid version's electric motor has a maximum power of 180kW and a maximum torque of 330 Nm. 3. The pure electric version uses lithium iron phosphate batteries, while the hybrid version uses ternary lithium batteries. The cost of lithium iron phosphate batteries is lower than that of ternary lithium batteries. 4. The BYD Han's front suspension uses MacPherson independent suspension, and the rear suspension uses a multi-link independent suspension.

Can a Turbocharger Oil Leak Be Repaired?

This situation depends on where the turbocharger is leaking oil. Generally, oil leaks from the oil pipe can be repaired, but if the leak is inside the turbocharger, it is best to replace the turbocharger. Turbocharger oil leaks are mainly caused by aging oil seal gaskets or poor lubrication leading to bearing wear. The specific reasons for turbocharger oil leaks are as follows: 1. Aging oil seal gasket: After years of driving, some parts inevitably age. If the oil seal gasket ages, it will cause oil leaks, and in this case, the gasket must be replaced. 2. Poor lubrication: If the lubrication inside the turbocharger is poor, it can cause friction between components, leading to wear and oil leaks. In this case, adding fresh oil or replacing the worn parts is necessary. 3. Turbocharger damage: If a collision damages the turbocharger, oil leaks will occur, and the turbocharger must be replaced directly.

What engine does the Zotye SR7 use?

According to the official introduction of Zotye Auto, the Zotye SR7 series uses a 1.5-liter turbocharged engine. This engine has a maximum horsepower of 160 hp, which is fully sufficient for urban roads. The engine model of the Zotye SR7 is 4A91T, which is a 1.5-liter four-cylinder turbocharged engine. The following is the relevant information about the Zotye SR7 engine: 1. This engine of the Zotye SR7 has a maximum horsepower of 150 hp, a maximum power of 110 kW, and a maximum torque of 195 N·m. It uses aluminum alloy cylinder block material, so it has good heat dissipation capability. At the same time, this engine adopts variable timing technology, DOHC valve train, and multi-point electronic fuel injection, so it has relatively high fuel economy. 2. According to the official introduction of Zotye Auto, the compression ratio of this engine of the Zotye SR7 is 9.5, so 92-octane gasoline can be used, which can reduce people's car usage costs to a certain extent.

What is the Principle of Power Steering?

The working principle of power steering is to assist the driver in adjusting the direction of the car, reducing the effort required to turn the steering wheel. The power steering systems installed in cars can generally be divided into three categories: mechanical hydraulic power steering systems, electro-hydraulic power steering systems, and electric power steering systems. The following are the forms of power steering: 1. Mechanical Hydraulic Power Steering System: A mechanical hydraulic power steering system is generally composed of components such as a hydraulic pump, oil pipes, pressure and flow control valve body, V-type transmission belt, and oil reservoir. 2. Electro-Hydraulic Power Steering System: Since mechanical hydraulic power steering consumes a significant amount of engine power, improvements were made on the basis of mechanical hydraulic power steering to develop the more energy-efficient electro-hydraulic power steering system. 3. Electric Power Steering System (EPS): It uses the power generated by an electric motor to assist the driver in power steering. The composition of EPS varies slightly among different car models, but it is generally similar. It usually consists of a torque steering sensor, electronic control unit, electric motor, reducer, mechanical steering gear, and battery power source.

Where to Check the Model Year of a Car?

Here are the methods to check the model year of a car: 1. Check the nameplate in the engine compartment. Inside the engine compartment, there is usually an aluminum nameplate that indicates the car's serial number, engine displacement, model, brand, and importantly, the specific production date. 2. Look for the small nameplate around the door seams. There is a small nameplate around the driver's or passenger's door seam, which clearly states the car's brand, model, production date, etc. 3. Check the VIN (Vehicle Identification Number) under the windshield. Every car has a VIN under the front windshield, and the 10th digit of the VIN represents the production date of the car. Each vehicle has a unique VIN.

Trending Ranking

Which cars are equipped with Burmester sound systems?

Are there any Mercedes-Benz cars equipped with three-cylinder engines?

How to Adjust the Seat to the Best Position?

Has the Cadillac ATS-L been discontinued?

What are the symptoms of a faulty fan clutch?

How to Read the Gauge on an Automotive Air Conditioning Pressure Meter?

What does TRIP-A mean on a car?

Why is the car's one-button start not working?

Is a Four-Wheel Alignment Necessary After Changing Tires?

Can You Still Drive After the Car Overheats?

More Forum Discussions

Is Crystal Coating Harmful to Car Paint?

Where are the accelerator and brake located in an automatic transmission car?

Where is the engine number of FAW Besturn B90 located?

Where is the car air conditioning evaporator located?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.