Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

A/C Circuit Diagram of a Car

Model: (Various brands) Various
Part: Checks and maintenance

The video shows the electrical diagram of the air conditioning (A/C) circuit of a car. At the centre of the system is the compressor, driven by a belt that compresses the refrigerant gas. Its operation is regulated by a pressure switch that protects the circuit from overpressure, and by a thermostat that monitors the internal temperature. These sensors send signals to the A/C relay, which controls the activation or deactivation of the compressor to maintain the cabin at the desired temperature. The electrical connection is completed by a dedicated fuse that protects the entire system from potential short circuits. Below, the cooling fan group comes into play to dissipate excess heat exchanged by the condenser. In summary, the diagram highlights how mechanical components and electrical sensors work together to ensure an efficient and safe air conditioning system.

Posted on 28 June 2026 by ScegliAuto

Video tutorial

Related tutorials

How the Temperature Sensor Circuit Works
How the Temperature Sensor Circuit Works
(Various brands) Various Let's see how the temperature sensor circuit works: electrical energy is supplied by the battery; the ignition key acts as a switch, while the fuse i…
How does a starter motor work
How does a starter motor work
(Various brands) Various The starter motor is a direct current motor that converts electrical energy from the battery into mechanical energy; it also has a solenoid inside th…
Wiring diagram of the windshield wiper motor with the wash pump motor.
Wiring diagram of the windshield wiper motor with the wash pump motor.
(Various brands) Various Let's see how the flow of these components works: the battery is the source of electrical energy, while the fuse protects the circuit. The ignition k…

Other guides you may be interested in

    Frequently Asked Questions

    • Vari - What does it mean when the message "insp" appears on a car? Read answer
    • Vari - What problems does the Kymco Downtown 300i have? Read answer

How to Open a Stuck Boot on the Peugeot 407?

On the Peugeot 407, the boot may become stuck, possibly due to a problem with the control button or the lock actuator. In such cases, you can perform an emergency opening by following the simple procedure shown in this tutorial. First, open the rear doors, then lower the seat back by operating the release lever. Next, go inside the boot, locate the lock, and manually operate it using a flathead screwdriver. The boot will then be free to open.

Watch the video!


by ScegliAuto

More videos