When the vehicle’s AC stops to blow cold air: Only a slipping clutch can cause the problem.Sometimes rust accumulation in the pulley and the clutch plate also may cause this particular problem. The AC compressor clutch starts screeching: It also happens due to an inappropriate air gap.The AC compressor clutch stops engaging: The cause behind the problem is an inappropriate air gap or improper clutch oil.Look at the common red flags to watch out for: The common symptoms of a defective AC compressor clutch:Īs the AC compressor clutch is the main component responsible to pressurize and distribute the AC’s refrigerant, you should always closely examine the component. The second term “energized” means – it has been connected to the power source. In automotive terms, the word “engaged” means it has triggered the particular mechanical operation. As a consequence, the AC compressor will stop working. If the clutch is de-energized it will automatically disengage the compressor drive and the compressor belt pulley. It allows the compressor drive and the car’s engine to rotate simultaneously. If you turn on the AC, the clutch gets energized and then engages the armature plate of the compressor belt and the compressor drive. The operations of an AC compressor clutch entirely depend on the car’s AC. When you observe a slipping AC compressor clutch – you have the sign of a serious problem such as an incorrect air gap or shorted clutch coil. This is the initial thing that starts moving every time while turning on the AC. Don’t you think it’s necessary to know how to manually engage the clutch without paying a visit to the mechanic?Īn AC compressor clutch is generally used to connect or disconnect the drive power to your vehicle’s AC compressor shaft. If the component does not work appropriately, the cold air flow suddenly stops to supply to the engine. For example, a dysfunctional ac compressor clutch is one of the most serious problems. If unsure, check with the manufacturer's manual for specifications and special procedures for performing the test.Being a car enthusiast, you must know that a vehicle can develop several minor or serious problems. Many coils contain zener diodes that allow current, but only up to a certain threshold. Many multimeters have a selection or function for testing diodes. Diodes are like one-way check valves the current flows in one direction but not the other. A reading of O.L or infinity indicates an open in the windings. A reading of 0.00 indicates that there's a short in the windings. Typically a clutch coil should be between the range of 2 to 5 Ohms, and any reading below 2 Ohms or over 5 Ohms indicates a bad coil. Resistance Test: Perform an A/C clutch coil resistance test with an Ohmmeter. If the battery voltage is present at the plug, test the coil for resistance. Using the 20 volt setting on the DVOM, check for battery voltage at the harness connector. Voltage Test: Remove the plug from the clutch coil and activate the A/C system by placing the selector on cold. Heat expands the coil and creates breaks in its windings. Before testing, visually inspect the coil for overheating and cracking. Check the circuit for proper voltage before testing the coil for resistance. Always use caution when working around hot or spinning parts. Take great care when running these tests, because the coil's harness plug is small and may be difficult to test. It protects relay contacts and the control devices, such as the PCM, the BCM, or the ATC module. The coil contains a clamping diode to prevent voltage spikes when the clutch suddenly disengages. When current is passed through the coil, it creates a strong magnetic field that pulls a splined hub into contact with the spinning pulley. An A/C compressor clutch coil is a simple device made of fine windings of wire wrapped into a coil.
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