Should the External Air Circulation Be Turned Off When Parking the Vehicle?

1 Answers
Jane
07/29/25 1:28pm
It is not necessary to turn off the external air circulation system when parking the vehicle. Doing so can lead to poor air circulation inside the car. Recirculating air inside the vehicle can cause the windows to fog up, which may reduce driving safety. Therefore, when temporarily parking the vehicle, it is essential to keep the external air circulation on or turn off the air conditioning system. Different vehicle models have different control methods, which can be divided into two types: The first control method involves buttons. The air conditioning control panel has buttons for internal circulation and external circulation. To use either system, simply press the corresponding button for internal or external circulation. The second control method uses a single button that toggles between internal and external circulation systems. When the button's light is on, it indicates the internal circulation system is active. The internal circulation system should be used when the air conditioning is on or when external odors are strong, effectively preventing outside air from entering the vehicle. Choosing between internal and external circulation depends on the following scenarios: Road conditions: On highways, use external circulation. Due to wind resistance and high speeds, opening windows is not advisable. Prolonged use of internal circulation can lead to hypoxia, impairing reaction and judgment, which is dangerous. Additionally, air quality on highways is generally good, with low exhaust concentrations, making external circulation suitable. In congested urban areas or during rush hours, where exhaust concentrations are high, switch to internal circulation. Vehicle condition: New vehicles often contain high levels of toxic gases like formaldehyde. For the first three to six months after purchase, it is recommended to use external circulation along with opening windows to enhance air circulation and dilute toxic gas concentrations. Air quality: In areas with severe PM2.5 pollution (above 50), where air quality is not good, it is advisable to use internal circulation to avoid inhaling excessive PM2.5 particles. Function of external circulation: External circulation ventilates the car, expelling stale, oxygen-depleted air and bringing in fresh air. In winter, if the heater is on, remember to switch to external circulation to prevent dizziness and chest tightness. Function of internal circulation: Use internal circulation during traffic jams or on dusty roads. Close the windows and switch to internal circulation to block external airflow. When parking, it is best to set the system to internal circulation. On long highway drives, if the air inside becomes stale, switch to external circulation. The use of internal and external circulation should be coordinated with the air conditioning and heating systems.
Was this review help?
6
2
Share
More Forum Discussions

Where is the power window fuse located in an old Jetta?

Jetta's power window control box is located above the fuse box, installed on the inner side of the dashboard. Composition of Jetta's electric power windows: Electric power windows are mostly composed of a motor, reducer, guide rope, guide plate, and glass mounting bracket. Depending on the material or manufacturing process of the guide rope, they are divided into three types: cable pulley type, flexible shaft type, and plastic type. The first two types use steel wire ropes as the guide rope, while the latter uses a plastic belt as the guide rope. Taking the commonly used cable pulley type electric power window as an example, it consists of components such as a motor, reducer, steel wire rope, guide plate, and glass mounting bracket. During installation, the door window glass is fixed on the glass mounting bracket, and the glass guide groove is parallel to the steel wire rope guide plate. Usage of Jetta's power windows: Activate the motor, which drives the reducer to output power, pulling the steel wire rope to move the glass mounting bracket, forcing the door window glass to move in a straight line upward or downward. The plastic belt type electric power window uses a plastic belt as the guide rope, with holes on the belt for moving and positioning the plastic belt, controlling the rise and fall of the door window glass.
5
3
Share

Where is the Bluetooth in the old Boxster?

The old Porsche Boxster does not come with built-in car Bluetooth. If needed, you can install it yourself. Method to install car Bluetooth: First, turn on the Bluetooth of the mobile phone you want to pair; turn on the car Bluetooth and press the multifunction key until the indicator light turns blue. Use the car Bluetooth to search for the mobile phone Bluetooth, or you can search for the car device via the mobile phone. Follow the instructions in the mobile phone manual to set the Bluetooth phone to search for Bluetooth devices. Functions of car Bluetooth: The function of car Bluetooth is to automatically identify mobile phones, allowing connection with the phone without the need for cables or phone holders; the owner can control the phone without touching it, even keeping both hands on the steering wheel, using voice commands to answer or make calls. Users can conduct calls through the car's audio system.
1
3
Share

Does the old Kia K5 have Bluetooth?

The old Kia K5 has Bluetooth. Below is an introduction to the Kia K5's Bluetooth. Location of Kia K5 Bluetooth: The Kia K5's Bluetooth can be turned on in the settings of the central control screen. The English name for car Bluetooth is CarBluetoothPhone, abbreviated as CBP. There is no dedicated button in the car to turn it on or off; all operations are performed through the central control screen. Method to connect Kia K5 Bluetooth: Turn on both the mobile phone Bluetooth and the car Bluetooth, and ensure they are in discoverable mode; on the mobile phone's Bluetooth interface, click "Search for devices," and the phone will be able to detect the car Bluetooth; select the car Bluetooth displayed on the phone, click on car Bluetooth, Bluetooth settings, and then pair; enter the correct pairing code, and the car Bluetooth will soon display "Connected."
16
2
Share

Where is the start button for the old Audi Q5?

Audi Q5's start button is located in front of the gear shift lever, below the central air conditioning panel. Audi Q5 starting process: Open the driver's door, release the electronic parking brake switch, press the brake pedal all the way down until it cannot be pressed further to prepare for engine start. Press the one-touch start button, all dashboard lights will illuminate, indicating the engine has started successfully. Audi Q5 one-touch start: If the vehicle is equipped with one-touch start, carry the key with you, press the brake, ensure the gear is in P or N position, then press the one-touch start button to start the engine. If the vehicle doesn't have one-touch start, there is a card slot on the instrument panel behind the right side of the steering wheel. Insert the key with the button side facing upward, press the brake, then push the key inward while ensuring the gear is in P or N position.
7
3
Share

Where is the sunroof drain hole located on the old Elantra?

The sunroof drain hole on the old Elantra is located in front of the right-side door. Introduction to the air conditioning drain hole: The air conditioning drain hole is generally located under the co-driver's seat on the car's chassis. A hose is used to drain the water from the air conditioning system to the ground. The engine compartment drain hole is located on both sides of the windshield wiper, allowing rainwater to flow out through the drainage channels on either side of the compartment. The door drain holes are located at the bottom of the door panels, typically with two drain holes per door to prevent rainwater from accumulating if one gets blocked. The exhaust pipe drain hole is hidden beneath the car's chassis exhaust pipe, designed to drain condensation from the exhaust gases. Importance of car drain holes: Many car owners have experienced clogged drain holes in their vehicles. For example, hearing water sloshing inside the doors while driving or finding the car's carpet damp in severe cases—these issues are usually caused by blocked drain holes leading to poor drainage. In serious cases, it can even damage the vehicle's mechanical components and electrical circuits. Therefore, during seasons with frequent rain, it's essential to clean the drain holes promptly and avoid parking under trees or other locations prone to clogging the drain holes.
3
1
Share

What is the battery model for the old Mazda 6?

The battery model for the old Mazda 6 is 65D26L (70AH) or 80D26L (75AH). Meaning of the battery model numbers: 6-QW-68L is also labeled as 12V-68AH-600A(SAE). 6-QW-68L is the battery model, where 6 represents 6 cells, with each cell being 2V, totaling 12V. Q stands for automotive use, and W indicates maintenance-free. 68 represents the battery capacity of 68 ampere-hours. Overall, this battery is a 12V, 68A maintenance-free starting battery. Lead-acid battery: Car batteries typically refer to lead-acid batteries. Lead-acid batteries are made of lead and lead oxide, with sulfuric acid solution as the electrolyte. The lifespan of a car battery is closely related to the vehicle's usage conditions. Under normal engine operation and no leakage in the vehicle's electrical equipment, it can last for more than three years.
7
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.