Always use manufacturer’s tension recommendations. Then look at the front of the compressor clutch. They are stored locally on your device. Method 3: Replacing The Clutch. This is a video that is geared towards people with an AC compressor clutch that doesn't work. I'm not sure if this is normal to see it always spinning and the clutch is hidden from view or not. Only after ruling out non-compressor problems can you begin testing the variable displacement compressor itself. Both the pulley and the clutch should be spinning. Sure, he is not the one that has to reclaim, vacuum and recharge 134a. A bad AC compressor clutch needs immediate fixing. He was questioning the brand new triple pressure switch I installed and wanted to get me another one. when I hooked that up it showed the system still had good pressure. Knocking noises from the compressor usually indicate internal damage, especially on piston-type compressors. Variable displacement compressors (VDCs) are the solution. Motor running, AC on max, fan on high. What is it? Compressor clutch disengaged and both rad fans stopped running. Turn the air conditioning controls to MAX AC and start the engine. Unless there is a serious mechanical problem, the compressor is always spinning, so there is no instant-on high-rpm clutch kick-in to sap engine power, or the potentially-damaging demand that the unit accelerate from zero to … When you turn the A/C system "on", a clutch behind the pulley mates the pulley to the compressor itself and it is ONLY at that point that the compressor turns and begins the vapor-compression cycle that creates cooled air in the passenger compartment. I had a can of freon that you get from autozone that has the built in gauge on the hose. I drained the A/C refrigerant and the compressor clutch stopped spinning. Did not want to charge the system if there is refrigerant at the correct level. h�bbd```b``~ "S��Lɡ"ExA$S�� �����l0[��?��`3�lQ��f׀H�H�pH2vz��[AdW9��&-��] �B�lf�z��@���uL@�3��a`���GW �i� endstream endobj startxref 0 %%EOF 190 0 obj <>stream It is an ominous sign when the clutch engages but the compressor does not spin. A delay can cause serious damage to the air conditioning system and the engine. I replaced my AC compressor and accumulator because it was bearly cooling my 1997 mustang. by Mercedes-Benz StarTuned | Oct 2014 | 0 comments. Ken, I removed the signal wire running from the relay back to the ECU. Compressor Assembly. its the front part of the pulley. Have an assistant turn on the AC controls to maximum. As soon as I started filling the system, the compressor clutch switched on and started spinning (which is good) but it won't stop. Automotive Tech Info uses cookies on this website. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Unless there is a serious mechanical problem, the compressor is always spinning, so there is no instant-on high-rpm clutch kick-in to sap engine power, or the potentially-damaging demand that the unit accelerate from zero to … I drive the car or let it idle for 1/2 hour twice a week. My 94 Cherokee (apparently not great AC systems to begin with) seems to be blowing only slightly cool air when AC … And why? Your car knows and can tell you. I have a 1998 Plymouth Town and Country. This switch is located on the metal canister next to the compressor. Will low refrigerant level cause the AC compressor clutch to not engage 15 Answers. The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. The other way the clutch could be bad and always on, is if got "friction welded" to the outer pulley while slipping. If you haven't yet, register for free access. The clutchless compressor when seen on a running engine gives the appearance of a regular clutch type unit with the clutch engaged, because the front hub plate is always spinning when the engine is running. Wait for the AC clutch in front of the compressor body to engage and spin. Hey people, I just bought a 94 325, and the ac system isnt working. If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. If not, is it a problem with the compressor, sensor inputs, or with the controller? I checked the clutch and its not engaging the compressor at all. If it does not, shut the engine off and disconnect the negative battery cable with a … I noticed my A/C compressor stays engaged when I turn the A/C on. It turns over, but won’t fire. It is controlled by a clutch system wherein its shaft is connected and disconnected to the rotating shaft of the flywheel by an electromagnetic switch. ... are tight under hood 2. start car and look at ac compressor to make sure compressor pulley is turning and that the fan clutch is engaged spinning. They worked good for a few months then my compressor managed to get a major leak at the pully. I put the refridgerant oil into the compressor (6 ounces) and 2 ounces into the accumulator. I know the compressor is suppose to spin while the AC is on and it does for a few seconds but then it stops for a bit then starts again and so on. Changing the compressor clutch could be the only solution in this case. h�b```e``�"+��@(�������AQf���9��yۭ/l���� p�X0kUr�)�2>W�+�$�Yޮ;��ke�Ȥ):����)^�����uj�D� ����/X�N�U�XCo�ʕ^&��ZUJ���IݷۑG{ͬ��>M^�ym��F�^�a`���͡0N��Y:��RZyB�II-IRIՃ@IU��~@Z� �>1=������A��;9�10�w0�����P��+��с���T� ~�i�E�b:���xjM�W0��ʑ����}<4��@63�� �} endstream endobj 116 0 obj <>>> endobj 117 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 567.0 756.0]/Type/Page>> endobj 118 0 obj <>stream So then…If you mean the air conditioning compressor clutch, it should only be spinning when it is electrically engaged such as when the selector switch is set to air conditioning or defrost. Jump to Latest Follow ... the clutch disengages and stops spinning like it should. Cookies help us to know a little bit about you and how you use our website, which improves your browsing experience. %PDF-1.6 %���� The ac compressor gets power ... is a metallic sounding screech for example take a coke can and drag it across pavement kind of sound it could be a bad compressor or a bad ac clutch. if i turn the air on, and down to 65 ... get down with the car off and spin the clutch of your ac compressor. Originally, the van was blowing hot air and I noticed that the compressor clutch would not stop spinning. Clutch on compressor is not turning. I checked the the charge on the low port and it had way to much pressure in it. The clutchless compressor will reduce swash plate angle to 2% when not activated by So start your diagnosis by determining if the compressor clutch works. My clutch to to the ac compresser is spitting out really thick black tar like stuff out when it engages and spins. One consistent thing I've read is to check how the compressor clutch reacts when you turn on AC - if it disengages then it doesn't have enough pressure and likely has a refrigerant leak. Your AC compressor should spin freely without the AC clutch engaged, for example with the defrost and A/C switches turned off. In this video, I show you how to tell if a car's AC compressor clutch is engaging. The front clutch will be hard to spin but if you spin the actual pulley where the belt rides it should spin free. I have an 1999 ML 320. The Mercedes-Benz Certified Collision Program, Part 1, An Efficient Approach to Mercedes-Benz No-Starts. Im trying to add freon to my ac on my chevy s10. I was talking with the guy at O'reillys. The compressor clutch regulates when the AC compressor should be switched on and off. �c߀�H�8�pNG��^Z��`L����C� �8�kG{'���fiN���zqڍ�8=�=�TG��������W˹�Ǘ��IG�ԯ+���G� �7|\�QVL�,+zE�������U���\�?T�M��+���P3����4������%��. Get the answer quickly. That means the clutch has properly engaged with the pulley. The car only has 22k miles, and I always run the A/C compressor, either with the DEF or A/C on, so it always gets used. Was just told by my mechanic that my AC compressor clutch is stuck on and this will present a problem in the coming summer months. h��Xms�8����X˒%{�a&Mi)��#@az�`%����v��_��N�))C�鸖���}���*R��� ^��2�;ڄBF�HERH��"t�"%�0�!-˜�G����= qQ,T` �@X �T�1��ŇB�:`�R��h4��Y(pà��*��l ����H(�bV�Br�� ɉ�rɉ�- � BK�0h$h��*�b6F#�9� �Ck� �F�9q(t�@r�����1$�&�@ۀ{ �F� 115 0 obj <> endobj 145 0 obj <>/Filter/FlateDecode/ID[<3C4BDD1821294BE39639F59720036AA5><2D5DB3BFF14B40A8A4391B99DD3E0CF3>]/Index[115 76]/Info 114 0 R/Length 133/Prev 484011/Root 116 0 R/Size 191/Type/XRef/W[1 3 1]>>stream If you have a situation where your car’s air conditioner compressor clutch doesn’t engage, try the troubleshooting techniques described here. If the pulley does not spin free all the time then your compressor bearing could be wearing out. 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