What are the symptoms of a faulty car air conditioning pressure switch?

1 Answers
VonIvan
07/29/25 8:46pm
The symptoms of a faulty car air conditioning pressure switch include: poor contact of the contacts or abnormal operation of the pressure switch, leading to the compressor not working or failing to provide normal pressure protection. Car air conditioning pressure switches are categorized into low-pressure switches, high-pressure switches, dual-temperature switches, and three-stage pressure switches. The inspection methods for car air conditioning pressure switches are as follows: 1. Check the continuity of the pressure switch. Use an ohmmeter to measure the resistance between terminals 4M1 and 4M2 of the pressure switch. The resistance should be 0. If the resistance is not 0, it indicates poor contact of the normally closed contacts in the pressure switch, and the pressure switch needs to be replaced. If the resistance is 0, proceed to the performance test of the pressure switch. 2. Perform a performance check on the pressure switch. Test the operation of the pressure switch under specified pressure conditions. If the test results are abnormal, replace the pressure switch.
Was this review help?
13
2
Share
More Forum Discussions

In which city is the headquarters of Hongqi located?

Domestic Hongqi brand cars are produced by FAW Group. In 1958, the first Hongqi brand luxury sedan was successfully developed, becoming a symbol of national automobiles. China FAW Group Corporation, abbreviated as China FAW or FAW, is headquartered in Changchun City, Jilin Province. Its predecessor was the First Automobile Works. More details about Hongqi are as follows: Introduction 1: In 1958, China's first domestically produced sedan, born at FAW, was not called 'Hongqi' but 'Dongfeng' with the model code CA71. The emblem on the front was not a red flag but a golden dragon. It was later renamed 'Hongqi' because of Chairman Mao Zedong's famous assertion that 'the East Wind prevails over the West Wind.' The car's engine was modeled after the Mercedes-Benz 190, and its chassis and body were inspired by the Simca Vedette. Introduction 2: As the most representative brand of national industry, Hongqi has broken through multiple technical barriers with seven major technological advantages: new platform, new intelligence, new energy, new power, new charm technology, new materials, and new craftsmanship. It has achieved several 'from 0 to 1' milestones in China's automotive industry and filled many technical gaps, setting technical standards for Chinese brands.
5
3
Share

What is the fuel consumption of the Toyota Prado?

Toyota Prado's fuel consumption can reach around 15L per 100 kilometers. With a full tank, the Toyota Prado with a 2.7L engine can theoretically travel 480 kilometers. However, when driving in the city, the fuel consumption tends to be higher, averaging around 15L. On the other hand, if you frequently drive on highways, the fuel consumption is relatively lower, approximately between 11L-13L, but even then, the Prado remains in a low fuel consumption state. Relevant information is as follows: Advantages: As an SUV, the Prado is inherently a high fuel consumption vehicle, but considering its performance, the fuel consumption is still acceptable. Its maximum acceleration can reach 180 kilometers per hour, and it has a wading depth of up to 700mm, which is mainly due to the advantage of its high ground clearance. Space: This vehicle offers a very spacious interior with ample room in both the front and rear rows, providing a comfortable ride. Additionally, the trunk space is also large, making it ideal for users who frequently travel or carry a lot of luggage. It can handle a maximum climbing gradient of up to 45 degrees, and its braking distance can extend up to 30.9 meters.
20
3
Share

What are the differences between Nissan Cedric and Teana?

The differences between Nissan Cedric and Teana: 1. Different body dimensions: The Cedric measures 5003mm in length, 1830mm in width, and 1490mm in height, with a wheelbase of 2900mm; The Teana measures 4868mm in length, 1830mm in width, and 1490mm in height, with a wheelbase of 2775mm. 2. Different engines: The Cedric is equipped with a QR25DE engine; The Teana is equipped with an inline 4-cylinder double overhead camshaft engine. The Teana is a flagship mid-to-high-end luxury sedan under NISSAN, featuring standard pneumatic massage seats, dual-zone independent air conditioning, rearview camera display system, active headrests, 6 safety airbags, and xenon headlights.
18
5
Share

What brand of tire is sptouring?

sptouring is an economical tire model from Dunlop. Here are some relevant introductions about tires: 1. The main functions of tires include dry grip, hydroplaning resistance, providing comfort, reducing driving noise, impact resistance, wet grip, load-bearing capacity, handling performance, even wear, and mileage. 2. The cross-sectional structure of tires can be roughly divided into 4 parts: tread, shoulder, sidewall, and bead. Each part has its own function. The tread mainly contacts the ground, the shoulder and sidewall provide support, and the bead contacts the rim to create a seal.
15
3
Share

Can high beams be used on highways at night?

When driving on highways at night, high beams should be turned on, but they should be switched to low beams when the distance to the vehicle in front is relatively close or when meeting oncoming vehicles. Here are some precautions for driving on highways: 1. Avoid fatigued driving: Fatigued driving is extremely dangerous on highways. Once fatigued, a person's physical reaction ability decreases, making it difficult to respond correctly to sudden situations. 2. Stay focused: Driving on highways is relatively smooth, but some people may get distracted, looking around, which is very dangerous. If other vehicles approach, panic can easily lead to accidents such as scratches. 3. Maintain a reasonable speed: Incidents like vehicle rear-end collisions and rollovers are increasingly common on highways, mainly due to speeding. Therefore, do not exceed the speed limit.
12
1
Share

What are the height and length limits for vehicles?

Heavy and medium-duty trucks, as well as semi-trailers, must not exceed a height of 4 meters from the ground when carrying cargo. Vehicles transporting containers must not exceed a height of 4.2 meters. Other motor vehicles carrying goods must not exceed a height of 2.5 meters from the ground. Relevant regulations: Article 50 of the Highway Law: Vehicles exceeding the prescribed limits for load, height, width, or length on highways, highway bridges, highway tunnels, or vehicle ferries are not allowed to travel on highways, highway bridges, or within highway tunnels that have such limits, nor are they allowed to use vehicle ferries. If it is necessary for a vehicle exceeding the load limit of a highway or highway bridge to travel, approval must be obtained from the transportation authority of the local people's government at or above the county level, and effective protective measures must be taken as required. Penalties for oversized or overheight trucks: Penalty standard for over-length trucks: A fine and 1 demerit point. Vehicles that are severely over-width, over-height, or over-length and obstruct the driver's view pose significant dangers on the road. If you encounter such over-length or over-width vehicles, keep a safe distance, especially avoid following them closely. If you need to overtake, do so quickly.
17
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.