How to Use an Automotive Air Conditioning Pressure Gauge?

1 Answers
StNathan
07/29/25 7:57pm
The method for using an automotive air conditioning pressure gauge: The gauge marked with blue is the low-pressure gauge, used to measure low-end pressure and vacuum. Readings greater than zero in the clockwise direction indicate pressure scale, while readings greater than zero in the counterclockwise direction indicate vacuum scale. The gauge marked with red is the high-pressure gauge, used to measure the high-end pressure of the air conditioning system. The pressure in an automotive air conditioning system is influenced by various external conditions, such as ambient temperature, engine speed, and condenser cooling conditions. Therefore, the standard for testing automotive air conditioning system pressure is based on a specific ambient temperature, compressor speed within a certain range, and condenser cooling under certain conditions, rather than a fixed standard.
Was this review help?
14
4
Share
More Forum Discussions

What Causes Abnormal Noises from the Wheels?

Wheels can produce the following three types of abnormal noises: 1. Clicking sound: This occurs when the tire is punctured by a nail or has a small stone stuck in it. The noise happens once per wheel rotation, resembling something "clicking" or "tapping" against the ground, with the rhythm speeding up as the vehicle accelerates. If it's a stone, simply removing it will suffice. If it's a nail, and the tire pressure is still acceptable, you can drive directly to a repair shop to fix the puncture. 2. Groaning sound: This is caused by uneven tire tread, giving the sensation that the tire is constantly running over something, producing a "groaning" or "rumbling" noise, often accompanied by steering wheel vibration and a tendency to veer left or right. In such cases, it's best to replace the tire (or rim) and avoid driving with the issue. 3. Overinflated tire noise: This results in increased tire noise. For most passenger cars, the recommended tire pressure is around 2.4 bar when unloaded (both front and rear) and around 2.6 bar for the front and 2.7 bar for the rear when fully loaded. Each vehicle may differ, so refer to the owner's manual for exact values. Overinflated tires not only produce loud noise but also make the suspension feel stiffer, leading to a bumpy ride and lighter, less stable steering. In such cases, simply release some air to adjust the pressure to the standard value.
14
1
Share

Can Vehicle Inspection Be Conducted in Another Location?

Except for large passenger buses and school buses which cannot undergo inspection in another location, all other vehicles can be inspected in a different location. Currently, the traffic management authorities have fully implemented cross-provincial inspection for small cars, trucks, and medium-sized buses. Applicants can directly conduct inspections in provinces other than where the vehicle is registered and obtain the inspection compliance mark without needing to go through the delegated inspection procedure. Large passenger buses and school buses cannot be inspected in another location and must return to the vehicle's registration location for inspection. Vehicle inspection time requirements: Small and micro non-operational passenger vehicles are exempt from inspection for the first 6 years. After 6 years but less than 10 years, inspection is required every two years; after 10 years but less than 15 years, annual inspection is required; after 15 years, inspection is required every 6 months. Operational passenger vehicles require annual inspection within the first 5 years; after 5 years, inspection is required every 6 months. Trucks and large and medium non-operational passenger vehicles require annual inspection within the first 10 years; after 10 years, inspection is required every 6 months. Imported vehicles, like other vehicle types, can undergo regular inspection at any inspection station. Notes for vehicle inspection: Vehicles that fail inspection must be repaired within a specified time limit. If they still fail after the deadline, the vehicle management office will confiscate their license plates and prohibit further driving. Vehicles that do not undergo inspection without reason or fail inspection are not allowed to drive on the road or transfer registration. Vehicles that meet the scrapping conditions or exceed the specified service life will not be inspected, and their license plates will be revoked, their files canceled, and they will be scrapped.
13
2
Share

How to reset the tire pressure light on Geely GS?

Press the MENU button on the turn signal lever, select the tire pressure display option in the mileage and fuel information menu, and then press the SET/CLR button. The vehicle's instrument display will show a tire pressure relearning interface. After selecting "Yes," the tire pressure light will disappear. Here are the detailed steps: 1. Press the "MENU" button on the turn signal lever, select the "tire pressure display" option in the "mileage and fuel information menu," then press the Set/Clr button. The driver information center will display "Tire Pressure Relearn," select "Yes," and press the Set/Clr button. The horn will sound twice, and the driver information center will display "Tire Pressure Learning Enabled." At this point, the left front turn signal will stay on. Increase (or decrease) the left front tire pressure by 8.3 Kpa, and once the horn sounds, stop the pressurization (or depressurization) operation. 2. Next, the "right front turn signal will stay on," followed by the right rear and left rear turn signals in sequence. Repeat the pressurization or depressurization operation for the remaining three tires. After all four tires have been operated, the turn signals will stay on for 3 seconds, and the horn will sound twice, indicating the completion of tire pressure learning. Adjust the tire pressure to the desired value. The tire pressure displayed on the information center is the actual tire pressure. If unsure, you can measure it with a tire pressure gauge. If the error is not significant, the process is complete.
19
3
Share

What documents are required for the Subject 1 exam?

For the exam, you only need to bring your ID card. The admission ticket and other documents are handled by the driving school, which will distribute them during the exam. Electronic IDs are not accepted for the exam. If you don’t have an ID card, you can apply for a temporary ID card, which holds the same validity as a regular ID card. The "Regulations on the Application and Use of Motor Vehicle Driving Licenses" clearly state that the Subject 1 exam can be taken twice on the same day. If you fail the first attempt, you can take a free second attempt. If you fail the second attempt, the Subject 1 exam is terminated, and you can only reschedule after ten days. The Subject 1 exam consists of 100 questions, including single-choice and true/false questions, each worth 1 point, totaling 100 points. If you answer 11 questions incorrectly during the exam, the system will automatically submit the test and end the exam. The Subject 1 exam is computer-based and lasts 45 minutes. The Subject 1 exam covers: driving license and motor vehicle management regulations; road traffic conditions and rules; traffic safety violations and penalties; road traffic accident handling regulations; basic knowledge of motor vehicles; local regulations; knowledge of braking systems and safety devices for large and medium-sized passenger and freight vehicles; specialized knowledge for wheeled self-propelled machinery, trams, and trolleybuses. Exam precautions for Subject 1: Candidates should dress appropriately (no slippers), and electronic devices and bags are not allowed in the exam room. Bring your ID card and queue to enter the waiting hall. Observe the instructions and procedures on the large screen, and store personal belongings in lockers before entering the exam room. Upon entering the exam room, candidates will be assigned seats at the identity verification desk. After finding your seat, begin the exam. Ensure the camera is aligned with you and follow exam rules. If you fail the first attempt, a retake is available on the same day. If you fail again, you must pay to reschedule. After the exam, queue to collect your score report and sign it—failure to sign renders the result invalid. There is no limit to the number of times you can reschedule the Subject 1 exam. Each subject can be taken once, with one retake if you fail. If you skip the retake or fail it, the exam is terminated, and you must reschedule. For Subjects 2 and 3, there are only five exam attempts. Subjects 2 and 3 can be rescheduled after ten days. If you fail the Subject 3 safety and civilized driving knowledge test, your passing score for the road driving skills test remains valid. The driving test consists of three subjects: Subject 1, Subject 2, and Subject 3. Subject 1 covers traffic safety laws, regulations, and related knowledge; Subject 2 tests field driving skills; Subject 3 includes road driving skills and safety and civilized driving knowledge. The safety and civilized driving knowledge test is conducted after Subject 3, so it is commonly referred to as Subject 4. However, the official term (under the Ministry of Public Security’s Order No. 123) does not include "Subject 4."
2
2
Share

What does the b1801 fault mean?

b1801 fault means "Driver side deployment device circuit short", which indicates the status of the airbag system to the driver through the airbag warning light. The following situations indicate a fault in the airbag system: 1. After the ignition switch is turned on: the light stays on continuously without flashing, or flashes 7-9 times and then stays on. 2. Light on: the light stays on while the engine is running. 3. Light off: the light does not stay on steadily during engine starting, or does not light up at any time. 4. Fault code: when the airbag system is put into diagnostic mode, the indicator light will flash the fault code.
17
3
Share

What is the reason for the ESCL failure preventing startup?

ESCL failure preventing startup is caused by the steering wheel not being unlocked, which prevents the vehicle's computer from starting. Here is an introduction to ESCL failure: 1. ESCL failure refers to the Electronic Steering Column Lock. ESCL is the abbreviation for Electrical Steering Column Lock, representing the electronic steering column lock in vehicles. 2. The electronic steering column lock is an electronic device used to secure the steering column, installed below the steering wheel system, and is part of the vehicle's anti-theft system. 3. In case of ESCL failure, it is advisable to promptly visit a 4S shop to diagnose the fault code using a computer, then repair or replace the problematic component, and finally use a decoder to clear the fault code.
6
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.