What is the pressure of 134a?

1 Answers
DiLeo
07/30/25 6:17am
Automotive air conditioning 134a pressure standards: The normal high pressure should be 1.3-1.7MPa or 13-17kg/cm2, and the normal low pressure should be between 0.15-0.25MPa or 1.5-2.5kg/cm2. In summer under direct sunlight, the high pressure may be slightly higher, up to about 2.5-2.8MPa, but generally does not exceed 3.1MPa. Automotive air conditioning refrigerant, commonly referred to as Freon, is also known as "refrigerant" or "coolant" in the market, and is divided into environmentally friendly (R134a) and non-environmentally friendly (F12). R134a is the most widely used medium-low temperature environmentally friendly refrigerant. It has excellent comprehensive performance, making it a very effective and safe alternative to dichlorodifluoromethane (CFC-12), and can be applied in most areas where CFC-12 is used. To measure the high and low pressure of the automotive air conditioning system, the engine should be idling, and the measurement should be taken at an ambient temperature of 35 degrees Celsius. If the low pressure is higher or lower than this range, it indicates abnormal expansion valve regulation. When the engine throttle is increased, the measured low pressure should decrease with the engine speed. The faster the speed, the faster the pressure drops, indicating good compressor performance. Otherwise, it indicates a compressor fault. The outermost ring of the low-pressure gauge shows the MPa value. For example, if the pointer points to "3," the current pressure is 0.3MPa. The second ring from the outside to the inside on the low-pressure gauge shows the value in kg/cm2. The innermost ring of the high-pressure gauge shows the bar value in red. For example, if the pointer points to "20," the current pressure is 20bar. The conversion formula for different pressure units is: 1MPa ≈ 101kg/cm2 ≈ 10bar ≈ 145Psi.
Was this review help?
8
5
Share
More Forum Discussions

How many points will be deducted for not wearing the seat belt in the driver's seat in 2021?

In 2021, not wearing a seat belt will result in a deduction of 2 points. Here is the relevant introduction: Danger: As is well known, when a car collides or encounters an unexpected emergency brake, it will generate a huge inertial force, causing the driver and passengers to collide with objects inside the car such as the steering wheel, windshield, and seat backrest, which can easily cause serious injuries to the occupants, or even throw them out of their seats or out of the car. The role of seat belts: Seat belts can restrain the occupants in their seats, preventing secondary collisions, and their cushioning effect can absorb a large amount of kinetic energy, reducing the degree of injury to the occupants.
12
1
Share

What brand of charcoal bags should I buy for a new car?

There are many types of bamboo charcoal. Avoid using perfumes; just use bamboo charcoal. Bamboo charcoal is made from alpine moso bamboo aged over three years, fired at nearly a thousand degrees Celsius. Functions of charcoal bags: Bamboo charcoal releases trace elements, improves the environment, kills bacteria, and purifies the air harmlessly. Bamboo charcoal has weak conductivity, which helps prevent static electricity. Benefits of charcoal bags: Purifying the air, it can adsorb substances from indoor materials such as artificial boards, paints, adhesives, and insecticides. It releases natural minerals and far-infrared rays. Bamboo charcoal emits far-infrared rays, known as "life rays," with wavelengths between 8 to 14 micrometers. Far-infrared rays promote metabolism, enhance immunity and healing capabilities, and provide auxiliary therapeutic effects for conditions like arthritis and insomnia.
14
5
Share

What Are Front-Wheel Drive and Rear-Wheel Drive?

Front-wheel drive (FWD) vehicles connect the engine to the transmission, which then directly transmits power to the front wheels via two drive shafts. On the other hand, rear-wheel drive (RWD) vehicles are powered by the rear wheels. Depending on the engine's position, RWD can be further categorized into front-engine rear-wheel drive, mid-engine rear-wheel drive, and rear-engine rear-wheel drive. Simply put, the structural difference between the two is that FWD vehicles pull the car, while RWD vehicles push it. The engine difference between FWD and RWD lies in the fact that RWD vehicles typically use longitudinally mounted engines, which occupy significant rear passenger space and add weight to the vehicle. The inclusion of a driveshaft also increases power loss. In contrast, most FWD vehicles employ front-mounted engines, positioned further forward, which improves cooling conditions. This design helps reduce unnecessary power loss and lowers fuel consumption. Handling is a major advantage of RWD vehicles. In FWD vehicles, the front wheels handle both steering and driving, which can lead to compromised performance, especially during sharp turns where understeer (or 'pushing') is common. RWD vehicles, due to their heavier rear ends, are more affected by inertia and can be prone to oversteer (or 'fishtailing') on icy or snowy roads.
4
5
Share

Is It Normal to Hear a Whistling Sound When Releasing the Throttle?

Hearing a whistling sound when releasing the throttle is not normal. This sound is often caused by a leak in the exhaust manifold or intake pipe, excessive turbocharger clearance, or a loose belt. Below are the relevant explanations: 1. Intake pipe leak: If there is a leak in the intake system, high-speed airflow will escape through the crack, producing a whistling sound and reducing the vehicle's power. 2. Excessive valve clearance: The valve, which controls the throttle, affects the vehicle's power output. Due to frequent opening and closing, the valve can wear out severely, requiring replacement to resolve the issue. 3. Loose belt: Most vehicles use rubber belts, which can become loose or worn over time. When the belt stretches, a noticeable whistling sound may occur during startup.
16
4
Share

What does the EPS light on the dashboard of the Changan CX20 mean?

The EPS light on the dashboard of the Changan CX20 indicates the car's electric power steering system, which illuminates when the system malfunctions. Below is an introduction about Changan Automobile: 1. Overview of Changan Automobile: Changan Automobile generally refers to Chongqing Changan Automobile Co., Ltd., which has established a global collaborative R&D layout with different focuses in "six countries and nine regions," including Chongqing, Beijing, Hebei, Hefei, Turin in Italy, Yokohama in Japan, Birmingham in the UK, Detroit in the US, and Munich in Germany. 2. Technological R&D of Changan Automobile: The Changan Automobile Global R&D Center is located in the Yufu Industrial Park in Liangjiang New District, Chongqing, and was officially put into use on April 9, 2019. Changan Automobile has deepened industrial cooperation, establishing joint innovation centers with Huawei, Tencent, Bosch, and Qingshan, and the Chongqing Intelligent Connected Vehicle Technology Center has also settled in Changan Automobile's global smart R&D platform.
18
2
Share

Where is the front tow hook on the Geely King Kong?

The front tow hook on the Geely King Kong is located under a square movable cover at the lower left side of the front bumper. Here is more information about the tow hook: 1. Operation of the tow hook: There is a one-inch square plastic cover on the front and rear bumpers that can be opened. Take out the threaded towing tool from the trunk and screw it in. 2. Towing equipment: Choose towing equipment with eye-catching colors, such as yellow, fluorescent green, or fluorescent red. If towing at night, use a tow rope or tow bar with reflective materials to enhance warning effectiveness. 3. Laws and regulations: According to Article 56 of the 'Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China,' small passenger cars are only allowed to tow travel trailers or trailers with a total mass of less than 700 kilograms, and no passengers are allowed in the trailer. Additionally, the safety protection devices must comply with the standards stipulated by the state.
18
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.