Is it acceptable to only evacuate the low-pressure side of a car's air conditioning system?

1 Answers
DiElla
07/29/25 6:27pm
No, it is not acceptable. Below is relevant information: Evacuation: Evacuation refers to the process of removing air from the car's air conditioning pipelines, while also extracting water vapor from the pipelines. This is because the refrigerant in the air conditioning system is highly sensitive to moisture. If there is air or water in the pipelines, the air conditioning system may fail to cool or provide insufficient cooling, affecting the comfort of passengers during summer. Therefore, to ensure the system operates correctly, evacuation must be performed before adding refrigerant. Purpose of evacuation: The evacuation of a car's air conditioning system aims to remove environmental moisture-laden air that enters the system when it is opened for maintenance. If refrigerant is already present in the system, evacuation is not necessary when topping up. In the absence of a vacuum pump, a portion of refrigerant gas can be added from the high-pressure side, and then released from the low-pressure side until a slight cooling sensation is felt.
Was this review help?
14
2
Share
More Forum Discussions

What are the differences between the 2019 and 2020 Nissan X-Trail models?

The 2019 and 2020 Nissan X-Trail models are merely annual facelifts with unchanged exterior designs, featuring only some adjustments in powertrain specifications. The differences are as follows: 1. The 2020 Nissan X-Trail is equipped with two naturally aspirated engines: a 2.0L producing a maximum power of 154 horsepower and a 2.5L delivering 186 horsepower, both paired with a CVT transmission. The 2.5L variant comes with a four-wheel-drive system, while the 2.0L model is front-wheel drive. 2. The 2020 X-Trail 2.0L Fashion Edition and 2.5L Intelligent Connectivity Leading Edition now include a tire pressure monitoring system. The 2.0L Intelligent Connectivity Premium Edition adds LED headlights, automatic headlights, lens projectors, and a power-adjustable front passenger seat. The 2.5L Luxury Navigation Edition gains ProPILOT Super Intelligent Drive (L2 autonomous driving assistance system), auto hold, LED headlights, automatic headlights, and lens projectors.
3
1
Share

What is the displacement of the Passat 300?

The displacement of the Passat 300 is 1.8L. Below are the relevant details about the Passat 300: 1. Body dimensions: Length, width, height, and wheelbase are 4872*1834*1484*2803mm respectively. 2. Powertrain: Equipped with a 1.8L inline 4-cylinder turbocharged engine, paired with a 6-speed automatic transmission. 3. Curb weight: 1520kg. 4. Drivetrain: Front-wheel drive. 5. Interior features: Bluetooth system, central console LCD screen, and dual-zone automatic air conditioning. 6. Luggage compartment volume: 490L.
1
1
Share

Is the Binrui Fuel-Efficient?

The Binrui is fuel-efficient. Below is relevant information about the Binrui: Simple and Stylish Interior: The silver chrome center console is exquisitely detailed; the 10.25-inch oversized display screen is packed with a high-tech feel; the leather-wrapped multifunctional flat-bottom steering wheel offers an excellent grip. Additionally, its seats are not only soft and comfortable but also feature natural tea fragrance and heating functions. Safety: It achieves the L2-level intelligent driving technology, a standard typically reserved for luxury cars, with the Binrui 200T configuration surpassing its peers. The Binrui 200T also provides multiple layers of safety assurance for secure driving, including the ACC adaptive cruise control system, ICC intelligent navigation system, LKA lane departure assist system, AEB-P city pre-collision safety system, and IHBC intelligent high-low beam control system. These features not only enhance driving pleasure but also offer drivers all-weather, all-road condition safety protection. Low Fuel Consumption: The G-power200T mid-mounted direct injection turbocharged engine in the Binrui 200T has been meticulously designed. This engine employs technologies such as high-pressure direct injection, dual variable valve timing, integrated exhaust manifold in the cylinder head, and an all-aluminum cylinder block, enabling the Binrui 200T to achieve top-tier fuel atomization efficiency with a fuel consumption of only 5L per 100 kilometers.
2
0
Share

Does Crossing the Yellow Line Count as Running a Red Light?

Determination is made based on three photos captured by electronic cameras: a photo of the vehicle crossing the stop line at the intersection, including the traffic light showing red and the license plate number; a photo of the vehicle completely passing the stop line, including the traffic light showing red and the license plate number; and a photo of the vehicle continuing to move, comparing to see if the vehicle's position has changed, including the traffic light showing red and the license plate number. If these three photos are captured, the vehicle is determined to have run a red light. Running a red light by a vehicle is clearly defined in the "Road Traffic Safety Law." Article 26 states that traffic signals consist of red, green, and yellow lights. A red light indicates prohibition of passage, a green light indicates permission to pass, and a yellow light serves as a warning. A red light is a traffic signal that prohibits passage. If a vehicle passes through an intersection when the light is red, it constitutes the traffic violation of running a red light. The following points can help avoid running a red light: First look at the arrow light, then the circular light: Currently, there are two types of traffic lights: arrow traffic lights and circular traffic lights. When arrow lights are present, first observe the arrow light and then the circular light to avoid running a red light. Note: When encountering a circular red light, right turns are allowed; when encountering an arrow signal light with a red right-turn arrow, right turns are prohibited, otherwise it will be penalized as running a red light. Brake in time: When the red light turns on, do not let the front of the vehicle cross the stop line. If the front wheels accidentally cross, and the rear wheels follow, the electronic camera will capture it, and it will be penalized as running a red light. If the front wheels have just crossed the stop line when the light turns red, passage through the intersection is prohibited; wait for the green light before proceeding. Check the green light countdown before proceeding: When the green light flashes, if there is a countdown, use it to judge; if there is no countdown, and the vehicle is close to the intersection with high speed, it may pass to avoid running a red light due to untimely braking. If the speed is slow and the vehicle is far from the intersection, brake immediately to stop and avoid running a red light. Article 38 of the "Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China" states regarding motor vehicle and non-motor vehicle signal lights: When the green light is on, vehicles are permitted to pass, but turning vehicles must not hinder the passage of straight-moving vehicles or pedestrians. When the yellow light is on, vehicles that have already crossed the stop line may continue to pass. When the red light is on, vehicles are prohibited from passing. At intersections without non-motor vehicle or pedestrian crossing signal lights, non-motor vehicles and pedestrians should follow the motor vehicle signal lights. When the red light is on, right-turning vehicles may pass if they do not hinder the passage of other vehicles or pedestrians. Running a red light is not considered illegal under the following circumstances: Yielding to special vehicles: Yielding to special vehicles such as ambulances or fire trucks. If captured by surveillance cameras while yielding, manual review will not record the act as running a red light. Even if recorded, you can apply for reconsideration at the traffic police department. Extreme weather: When visibility is so low that even electronic police cannot clearly see the traffic lights. The photos of the violation may be blurry, and if you accidentally run a red light, the traffic police will not impose penalties. Emergency situations: When rushing a critically ill patient to the hospital, you may run many red lights, and 12 penalty points may not suffice. After delivering the patient, provide proof from the hospital or the rescued individual to the traffic police for verification. If confirmed, the violation record can be cleared. If possible, it is best to call an ambulance to avoid accidents caused by running red lights. Traffic police direction: During peak hours, traffic police may temporarily direct traffic at important intersections. Drivers should follow the gestures of the traffic police.
4
3
Share

Why does the old Jetta car shake when starting?

Old Jetta cars shake when starting due to dirty throttle bodies or fuel injectors, causing engine vibration during operation. It is recommended that the owner clean the carbon deposits. The accumulation of carbon deposits and dirt on the throttle body and fuel injectors leads to a decrease in power, resulting in car shaking during idling and starting. Jetta is a joint venture of the German Volkswagen Group in China and is a car brand under FAW-Volkswagen Automotive Co., Ltd. Its first product, the Jetta, was launched in Europe in 1979. Structurally, the Jetta is essentially a Golf with an added trunk, making it a derivative model of the Golf.
16
0
Share

How to Solve Engine Resonance in Old Jetta?

Solutions for engine resonance in old Jetta: Choose to replace spark plugs or exhaust pipe rubber hangers. All car engines produce resonance phenomena. There are three types of engine resonance: low-speed resonance, high-speed resonance, and wide-range resonance. Engine resonance involves multiple factors such as engine mounting position, overall vehicle weight, and suspension type. The specific solution depends on the car's condition. Jetta is a car brand under FAW-Volkswagen, a joint venture of the German Volkswagen Group in China. The first Jetta model was launched in Europe in 1979. Structurally, the Jetta is essentially a Golf with an added trunk, making it a derivative model of the Golf.
20
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.