Therefore, if the oil level is getting low, the AC will automatically shut the compressor off.Įxcess Refrigerant: If the system has refrigerant overcharge, the clutch will not be engaged. This is the work of oil in the compressor. Like any other mechanical device, the AC compressor must have a lubricant between its internal parts to prevent metal-to-metal contact. Read Also: Why is My Car Air Conditioner Not Blowing Cold Air? Now that we have understood about an AC clutch and how does it work? Let us now discuss reasons that may cause the AC clutch not to engage. It subsequently makes the compressor turn and compresses the refrigerant. When the user presses the AC button, the electromagnetic coil is energized and attached to the pump rotor by a strong electromagnetic force. The compressor clutch consists of a friction plate positioned adjacent to an electromagnetic coil. As we stated earlier, to start the compressor turning, the clutch must be energized and engaged to the spinning pulley. When using the car’s air conditioner, its air condition compressor must be activated. Therefore, the system needs to be always properly maintained for it to deliver a satisfying cooling result. The AC clutch is a part of the AC compressor, the heart of the Air conditioning system. The shaft is joined to the flywheel’s rotating shaft by an electromagnetic switch. The AC clutch is controlled by a clutch system. It is connected to the flywheel with an accessory belt, and that is how it gets its power. You will also learn how to jump AC compressor clutch to prevent you from getting into sudden AC compressor clutch failures.īefore we get into details on the reasons for the AC clutch not engaging, it is crucial to have some information about the AC clutch.Īn AC clutch is what makes the AC compressor turn. Once you read this article, you will be able to diagnose and know the reason behind the failure. They range from simple to more complicated reasons. Several possibilities can lead to AC compressor clutch failure. We shall discuss the AC compressor, AC clutch, and problems related to the two components. No battery voltage at the connector means problem is elsewhere, probably start with checking for refrigerant leaks.If your AC clutch is not engaging in your car, this article is for you. If you're intent on testing the circuit, the best way to check is to simply check for power at the connector to the compressor - with AC turned on, battery voltage at the connector, yet no clutch engagement, means bad magnetic clutch, which means replace the compressor. Of course, this means it's also possible you have an issue with the wiring between the IPDM and compressor, but magnetic clutch failure is a very common failure on compressors, and the most likely cause of the issue. This says that the car deemed the system was fit for activation, and sent all the signals to activate all the systems, and the compressor was the only one that did not respond to the signal. If the cooling fans do turn on, but the magnetic clutch does not activate, the problem is likely the magnetic clutch - replace the compressor. If there is a problem somewhere in the system preventing AC operation, either electronic or pressure related, the car will not allow the system to turn on, and will not turn on the cooling fans - look somewhere other than compressor magnetic clutch failure, because the clutch is not being commanded on. If you then turn the AC on, the car will also activate the cooling fans (to increase airflow over the condenser, necessary for AC operation). At idle, if the engine is anywhere between cold and normal operating temperature, and the AC is turned off, the cooling fans should also be off. Your car may also have a variable voltage signal to augment compressor output, but the clutch is either engaged or off, making the compressor either on or off.īut there's an easier way to isolate the culprit to the compressor specifically without testing circuits - watch the cooling fans. But the magnetic clutch isn't on a separate circuit - it's an on/off signal sent to the compressor, i.e. There is a fuse for the AC compressor, I think in the IPDM in the engine bay behind the battery near the windshield cowling.
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