What are the reasons for the car air conditioning relay not engaging?
3 Answers
The reasons for the car air conditioning relay not engaging include: broken coil wire, inter-turn short circuit in the coil, foreign objects between the armature and the iron core, excessive tracking, and reed deformation leading to excessive contact gap. The reason for the relay not engaging could be that the engagement voltage does not meet the standard, or there might be a fault with damaged relay contacts. Relevant information about car air conditioning is as follows: 1. Introduction: The car air conditioning device (air-conditioning-device), referred to as car air conditioning. 2. Function: It is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car compartment to the optimal state, providing a comfortable riding environment for passengers and reducing travel fatigue; it creates good working conditions for the driver and plays an important role in ensuring safe driving as a ventilation device.
Last time when I was driving, the AC had issues—the relay just wouldn't engage, turning the car into a sauna on hot days. The main causes are usually a faulty relay itself, like a burnt-out coil or oxidized contacts causing poor connection; a blown fuse cutting off the power supply; a malfunctioning control switch failing to send signals; wiring problems such as loose plugs or aged wires causing short circuits; and sometimes unstable voltage, like a nearly dead battery. I must remind you, a non-functioning AC isn't just uncomfortable—it could also lead to accidents on long drives due to distraction. I suggest first checking the owner's manual to locate the fuse box and inspect the fuses, then try replacing them. If the relay remains silent, visit a repair shop to test the voltage or replace the part—don't push through. Remember to maintain the AC system regularly with seasonal check-ups to prevent such issues.
As an ordinary user who drives my family around every day, I've encountered the issue of the air conditioning relay not engaging. Common causes include internal component failure or overheating damage in the relay; blown fuses causing circuit interruption; worn contacts in the control unit preventing signal transmission; poor wiring connections or short circuits; and self-protection triggered by compressor overload. When the AC fails, the temperature inside the car soars, posing a risk of heatstroke, especially when children are present. My experience suggests keeping a small toolkit handy for simple checks on fuses and plugs, and regular dust cleaning. If problems persist, visiting a professional repair shop is cost-effective and worry-free. Annual AC maintenance, including checks on refrigerant and circuits, helps prevent unexpected breakdowns.
