Low coolant content or pressure can be dangerous for the system of your car. If something is off the AC compressor my not switch on. The sensors in your AC will measure if the pressure is correct.
Check for leaks in your AC system - look for leaks from the condensor, reciever, or any areas where the metal piping connections are made.īeing low on the coolant might be another reason why you will find the AC compressor clutch not engaging. Pull it and check for both power and ground on the relay through its terminals in the socket. If all is fine with the fuse, you need to check the clutch relay. 
The car may need to be turned on, although the engine can still be off. If you are unable to get the voltage reading, check the fuse.
You could get a digital multimeter and check the voltage and the ground at the removed connector. Carefully inspect all the components of the system to diagnose the issue faster. The relay is however grounded by a computer in a controlled system. In some of the cars, the compressor clutch relay goes on and off due to the low-pressure switch. Before you take the next step, it is important for you to know the basics of a few components. (In addition the high pressure switch and evaporator temperature sensor could be faulty or have loose wires) Wire need to be connected and in good condition to provide enough power. Check the wiring to the clutch - If wires aren't connected properly this could impact how the compressor is working. 
Check for rust around the clutch plate - Rust could be an indicator that the compressor is old and may just need to be replaced because it has worn down and become broken. Look at the compressor and check that the belt going over the pulley is in good condition - If the belt is slipping or worn it will need to be adjusted or replaced. (CAUTION - Be aware that if your unsure about what circuits to test, get help or try another method so you don't cause more problems.) Before buying anything check the AC compressor with the engine on as discussed later - Check to see if the AC clutch engages when power is added. If you want to purchase a power probe for the clutch you can do that or try to use a wire such as in the video above. Lets make sure your AC is working well, and get started. It could be anything from an obstruction in the refrigerant circuit to a loose wire. We'll talk about the possible problems and solutions for a compressor clutch that is not engaging. You may decide to check the engine coolant and the engine oil as well to rule out other issues, but the clutch if the component that must function in order for the AC to work. If the AC is not blowing cool air into the car, you may want to do a visual inspection of the AC compressor clutch, and determine if you can see what might be causing the clutch to not engage.Įven if you just filled up the AC system with refrigerant, if the AC compressor can't operate correctly you'll get warm air. If the compressor clutch doesn’t engage that usually means there's an electrical or mechanical problem with the compressor. The compressor could have a serious issue or a small one. What could be the problem? If all of a sudden, the AC compressor clutch stops working and doesn’t engage, this could be the reason your AC isn't functioning properly. However, when you turn on the air conditioner it only blows warm air. Imagine, you’ve got a car and it all works so fine.
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