How to check your cars A/C compressor clutch coil. 3 Easy Ways! 

Glad it was helpful!

Hello, In an A/C system there are many variables that can lead to a fast cycling of the compressor. To better assist you, when you have the A/C gauges hooked up to the low and high side with the car running and A/C on, how low does the low side gauge go down before it cycles? And also, how high does the high side go up before it cycles? This will give me a better idea of the health of your system so I can further help. Without this info I could send you in the wrong direction. Thanks for watching.

This is a very good question. I have noticed on some model vehicles the sound is quieter than others. I would say its due to the design of the compressor clutch coil combo. Even though it's quieter, I have been able to hear an audible click or smacking sound. But there might be another design that I'm not aware of that operates very quietly. If you don't mind me asking, which make and model vehicle does your friend have? Maybe I can dig up some info on the type of A/C system that's in his vehicle. Thanks for watching!

Thanks again for taking your valuable time to reply.My car model is Honda Jazz 2015 model .My friend's car is Peugeot 208 Diesel engine, i recently recharged A/C gas for and noticed that clicking frequency is lower now, is it because compressor has to work for less time or less loaded now?

​@user-mz7nk5wo6v I would like you to imagine a pump. This pump has a suction side where it pulls freon and a pressure side where it pushes freon. This pump is your A/C compressor. Now, this pump has two switches. One is for the suction side called the Low Pressure switch and one is for the pushing side called the High Pressure Switch. These pressure switches help your A/C system work properly. Basically, they turn on and off your compressor clutch coil. So, when your compressor is working, it will start to push freon throughout the system. But if it's low on freon, the low-pressure switches will turn off the compressor until there's enough pressure to turn on again. Think of it like a sweet spot that the system tries to maintain. So when you added more freon gas into the system, you have helped it. Now, when the pump runs, the pressure on the low side doesn't go low right away and the compressor turns on and off less. I hope this helps 🙏 Later on, I'll make a video on this subject. And you're welcome. I'm more than glad to help

So, if I'm understanding this correctly, you only have power to the coil when you run the engine. If this is the case, then that is normal. If you had power to the coil at all times, then you would have a dead battery within an hour or so. Now, here are some other things to check for: I have found a/c compressors with a good coil, but the clutch plate is broken or has fallen off. Also, your system works with a high-pressure switch and a low-pressure switch. If one of these are bad your coil will work sometimes or not work at all. If you can, put a set of gauges on and check your freon level. If you don't have enough freon the coil won't turn on, or short cycle. And the clutch turns on and off too quickly to cool down the truck. But if your system has too much freon it with do something similar. I know this is a lot to check for but by doing a process of elimination you can determine what is faulty in your a/c system. I will be doing a series of videos on all these topics. Hopefully you can get your system working before then.

Good question, yes there is safety system in place. The low-pressure switch is wired into the electrical circuit to prevent the A/C compressor from turning on when there is low pressure or no refrigerant. You can bypass the switch just to test the circuit. But you should only do this for testing. Just like you motioned the compressor will run until it destroys itself. (I have seen this happen before) Also, there is a high-pressure switch as well. This prevents the system from building too much pressure. Together these two simple switches play a very imported roll in our A/C system. Thanks for the question this subject will make a great video!

Set the multimeter OHM (Ω)