What does it mean when the car's internal circulation light is on?

1 Answers
FernandoAnn
07/29/25 7:38pm
The internal circulation light being on indicates that the internal circulation mode is activated. Internal circulation button: If the internal and external circulation buttons are separate, each controls its respective circulation state. The light being on means that function mode is active. If the internal and external circulation functions are on the same button, when the indicator light is on, it is in internal circulation mode. When the indicator light is off, it is in external circulation mode. Function of internal circulation: The purpose of the air conditioning internal circulation mode is to prevent outside air from entering the car. When the outside temperature is very high or very low, selecting the air internal circulation mode allows the air conditioning system to operate in this mode for a short time, quickly lowering or raising the temperature inside the car. If equipped with an air quality sensor, when the system detects an increase in the concentration of harmful substances in the outside air, it will immediately and automatically activate the air internal circulation mode to prevent outside air from being drawn into the car. Once the concentration of harmful substances in the outside air decreases to normal levels, the system will immediately and automatically turn off the air internal circulation mode, allowing fresh air to enter the car again.
Was this review help?
8
0
Share
More Forum Discussions

Should the AC be turned on when using the car air conditioner in summer?

In summer, the AC should be turned on when using the car air conditioner. After pressing the AC button, the temperature should be adjusted to the blue position. For automatic air conditioning, you can set a temperature and press the AUTO button, and the system will automatically adjust the interior temperature. The AC in a car air conditioner is the switch for the compressor, which delivers cold air. Things to note when using the car air conditioner: 1. When the vehicle is turned off, the car air conditioner can only blow air and cannot provide cooling or heating; 2. Do not use the air conditioner for extended periods with all windows closed to prevent carbon monoxide poisoning for the occupants; 3. Regularly clean the air vents and air filter of the car air conditioner.
17
5
Share

Is There a Difference Between Paint Jobs at 4S Stores and Outside Shops?

The difference between paint jobs at 4S stores and outside shops lies in the fact that technicians at 4S stores are more professional, the paint quality used is superior, and the paint booths at 4S stores are more advanced, with better working environments. Here are some precautions to take after a car paint job: 1. After painting, be cautious when washing the car. Avoid using anything other than soft water, including hot water, alkaline water, or water with high hardness, as these can damage the paint. If hard water is used to wash the car, it may leave marks on the paint surface after drying, affecting the appearance. 2. Do not expose the car to direct sunlight or wash it immediately after the engine cools down, as this can impact the paint surface and shorten its lifespan. 3. Avoid using high-pressure water streams to wash the car body. If there is stubborn dirt, first soak it with water and then rinse gently. Use a dispersed water stream for washing, as excessive water pressure can damage the paint. 4. Do not randomly use cleaning agents. For tough stains, choose appropriate cleaning agents. For oil stains, use a sponge lightly dipped in kerosene or gasoline to wipe gently, then apply polishing paste to restore shine. For biological residues like dead insects, first soak with soapy water, then clean with a damp sponge.
17
1
Share

Which Side is the Steering Wheel on Japanese Cars?

Japanese cars have the steering wheel on the right side because Japan follows left-hand traffic rules. Countries that drive on the right side of the road include: the United States, Canada, China, Russia, Germany, France, and Brazil. Countries that drive on the left side include: the United Kingdom, Japan, Singapore, India, Pakistan, Indonesia, Thailand, Australia, and New Zealand. Japanese car brands include Toyota, Honda, Lexus, Infiniti, Mazda, Mitsubishi, Nissan, and Suzuki. Taking the Lexus ES as an example: it is a mid-to-large-sized sedan equipped with a 2.0L naturally aspirated engine, producing a maximum horsepower of 173 and a maximum torque of 208 Nm, paired with a CVT continuously variable transmission.
8
1
Share

Is the Engine Malfunction Light On Due to the Need for Catalytic Converter Cleaning?

The engine malfunction light in a car may illuminate because the catalytic converter requires timely cleaning, which is performed using the 'drip method.' This method involves connecting a plastic hose to the engine's vacuum solenoid valve and utilizing the air pressure in the hollow tube to draw cleaning agent from an infusion bottle into the engine. As the cleaning agent exits through the exhaust pipe, it cleans the catalytic converter. Composition of the Catalytic Converter: A catalytic converter typically consists of four main components: the shell, vibration damping layer, substrate, and catalyst coating. The shell is made of stainless steel to prevent oxidation scale from peeling off, which could clog the substrate. The vibration damping layer is composed of gaskets or wire mesh pads, serving to seal, insulate, and secure the substrate. To protect the substrate from damage due to vibration, thermal deformation, and other factors, the gasket is made of expanded mica and aluminum silicate fibers, bonded together with adhesive. The substrate is constructed from honeycomb-shaped ceramic material, though many are also made from metal (including stainless steel). The catalyst consists of precious metals such as platinum, rhodium, and palladium, which are sprayed onto the substrate to form the purifying agent. Lifespan of the Catalytic Converter: The service life of a catalytic converter ranges between 80,000 to 100,000 kilometers. The exact lifespan depends on the vehicle's usage conditions, as well as the quality of fuel used and the driving environment.
16
3
Share

How to set the mirror folding for Q5?

q5 setting method for mirror folding: Open and close the automatic folding function of the mirror when the car is locked in the infotainment system. There is a button to adjust the mirror on the driver's side door handle. Turn the knob to another position to unfold the mirror. Q5 belongs to the medium-sized SUV, with a body size of 4753mm in length, 1893mm in width, 1659mm in height, a wheelbase of 2908mm, a fuel tank capacity of 73l, and a trunk capacity of 550l. Q5 is equipped with a 2.0t turbocharged engine, with a maximum horsepower of 190ps, a maximum power of 140kw, a maximum torque of 320nm, and a 7-speed dual-clutch transmission.
18
0
Share

What are the reasons for loud engine noise at idle?

The reasons for loud engine noise at idle are: 1. The engine oil does not meet the standard or the amount of oil added exceeds the standard, causing unnecessary resistance to the crankshaft rotation, thereby affecting power output; 2. The engine fuel is not fully consumed during frequent use of the car, leading to carbon deposits in the engine; 3. The engine mount pads are aging or loose, affecting the engine and increasing noise. The types of car engines vary depending on different situations: according to power, they are divided into diesel engines, gasoline engines, electric vehicle motors, and hybrid power; according to the intake system, they are divided into naturally aspirated, turbocharged, mechanically supercharged, and twin-charged.
11
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.