![]() ![]() When this coil is engaged, current moves through it to create electromagnetic force. It’s located next to an electromagnetic coil. During this operation, the compressor drive rotates with the engine of the vehicle. This process engages the plate, along with the compressor belt. When the AC is turned on, the clutch gets electrical energy. The clutch is operated by an electromagnetic switch in most vehicles. It’s meant to engage and disengage the compressor pulley from the drive. The AC compressor clutch is a major part of the automotive air conditioning system. RELATED: 5 Signs of a Bad AC Compressor Clutch (& Replacement Cost) What is the AC Clutch? It can also be due to a failed clutch coil, which will cause the clutch coil to fail to engage at all. It could also slip at times, leading to erratic operations. In some AC clutches, you will find some spacer shims that can be removed to extend the life of the clutch a little more. ![]() With the clutch plate worn out, the clutch may not be able to engage. The clutch isn’t going to normally wear out when it’s newer. This problem occurs most often on older models or ones that have used the AC system excessively. Just like any clutch, it’s possible that it has simply worn out. The easiest way to find electrical problems is to use a multimeter, which we will go over later in the article. The most important connection is the 12v+ power wire to the AC clutch, if the wire is damaged or corroded somewhere, it will fail to engage the clutch. If there’s a problem with any of them, the clutch could fail to work. Your car’s AC system contains many electrical wires and connections. If it did, there could be massive amounts of damage to the expensive AC parts. Check your owner’s manual to find the fuse for the AC clutch. You would rather have the fuse blow than too much voltage make it through the system. ![]() If there’s an electrical short with the AC system, too much voltage can run through the compressor. RELATED: 4 Symptoms of a Bad AC Pressure Switch (High or Low) 3. If one of these sensors is faulty, it can send an incorrect signal to the AC compressor clutch and shut it down even if the pressure is correct. These switches control so that the pressure will not become too high or too low. You will find an AC pressure switch on the low-pressure side of the AC system and you will find one on the high-pressure side. RELATED: 5 Signs Your Car’s AC is Low on Freon (& What to do) 2. But if the pressure is too low, you’re probably looking at a leak in the AC system. Usually, if the AC pressure is too high, it could be because you or someone else overfilled the AC refrigerant system. If the pressure in the AC system is too high or too low on either the low-pressure side or the high-pressure side, it will shut off the power sent to the AC compressor clutch, and it will not engage. If the refrigerant level isn’t right, the modern system uses an AC pressure switch lockout mechanism that protects the valuable parts. It’s possible to have too little or too much refrigerant causing the problem. The air conditioning system needs the right amount of refrigerant to run properly. Here is a more detailed list of the most common reasons why your AC clutch is not engaging: 1. It can also be caused by a faulty high or low AC pressure switch, a blown fuse, a bad AC clutch or a bad electrical connection. The most common reason why your AC clutch is not engaging is that the AC refrigerant level is too low or too high. Is the AC clutch supposed to spin all the time? Common Causes of AC Clutch is Not Engaging ![]()
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