Another reason behind the auto ac compressor clutch staying engaged could be because the refrigerant levels are low. Moreover, you should also checkthe desiccant of the accumulator or drier/receiver. It has to drop below 20 to disengage the clutch. If you turn the AC off, the clutch loses its electrical energy. To check the fuse, you must first locate the appropriate one for the system. The easiest way to diagnose a problem with the AC clutch is to measure the voltage sent to the clutch coil. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. In the orifice tube system, there is no drier. When the accelerator pedal is depressed, power from the engine goes through a belt and through gears to turn this motor, which rotates and forces air out of the compressors discharge side while drawing in low-pressure, ambient air on its suction side. between the compressor and evaporator might indicate that the system is overcharged with the refrigerant. With the A/C compressor clutch engaged, compare the air temperature at the center panel outlet and the A/C compressor discharge pressure (high side) to the A/C Performance Temperature and Pressure chart. 620 Divisadero St, San Francisco, CA 94117, AC Clutch Engages Intermittently [Solved! There is a chance that the AC clutch engages intermittently in your car. 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However i have noticed that it is always engaged and spinning, even when ECON mode (AC off) is engaged. In most cases, when the AC is turned on you will be able to hear the compressor switch on. The cycling time is not right. Similarly, too high pressure of the refrigerant at the inlet of the evaporator gives poor heat transfer at the evaporator. The air gap between the friction plate of the clutch and pulley is determined by the automobile company and is related to the strength of the AC clutch coil. Similarly, high pressure on the high-pressure gauge i.e. Then, try to start your car with the A/C engaged and turn off your vehicle again. How Does the Clutch System of Car AC Work? I Replaced The Orings On The Unit Due To A Leak. Is There Have Not Used The Air Conditioner For A Few Years Because Of Extremely Loud Noise Coming From Compressor. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. AutoMotive Guider is reader-supported. The relay tells the magnetic clutch on the AC compressor to engage or disengage. 2011 Failure of AC Compressor Clutch. Symptom 2: AC compressor clutch screeches Again, it can be due to improper air gaps or rust accumulation in the clutch plate and pulley. Many things go into when to bleed brakes- one of the most important beings when the car should be on. Next, unplug the single wire connector on the front side of the compressor and take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. This could lead to worse issues. The AC compressor staying engaged all the time is a symptom of an issue in your automobile. Perfectly Guide. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. above 4000. In somevehicles, the evaporator temperature sensor turns on and off the clutch relay. Since a serpentine belt transfer power from the crankshaft pulley to the compressor pulley, chances are that it is also causing engaging and disengaging of the AC clutch plate. (The Full List). Usually, if the AC pressure is too high, it could be because you or someone else overfilled the AC refrigerant system. The following errors occurred with your submission, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. The main factors are the outside and cabin temperatures, engine RPM, vehicle speed, AC system design, and how hot it is outside. ), 4L60E vs 4L80E: The Performance Transmission Comparison Guide, Bad car water pump symptoms (Helpful Guide). If your engine still turns off after several minutes, then youll need to move on to the next step. Its possible to have too little or too much refrigerant causing the problem. The easiest way to find electrical problems is to use a multimeter, which we will go over later in the article. Low 35 are so, high going up to 250. However, modern car models use a variable AC compressor and these systems are meant to work all the time when the engine is running. between evaporator and compressor might indicate that the AC system is low on freon. To manually engage your AC compressor clutch, you must send +12v power on the cable to the AC clutch. Once the compressor is overcharged, the unit will read abnormal high pressure. The low-pressure switch is located on the metal canister next to the compressor and is screwed into the refrigerant canister. Lets go! When the clutch is disengaged, the compressor will not turn on. Therefore, these components, plus other vehicle parts, should be adequately maintained to ensure theyre in good working conditions. 5 Reasons Why Your AC Clutch is Not Engaging. Very weird! The pressure transducers convert refrigerant pressure to electric signals. Measure the voltage coming to the connector with a multimeter, and if everything is activated properly, you should see 12 to 14 volts coming to this wire. Its controlled and monitored by a clutch system through engaging and disengaging to a cycling shaft with the help of an electromagnetic switch. In orifice tube systems, you will findan accumulator on the low-pressure line between the evaporator and compressor. Instead, the orifice tube is responsible for filtering out the impurities and debris from refrigerant when it comes through its screen. AC compressor is not turning on. A slipping clutch is a sign of severe wear or an increased gap between the friction plate and compressor pulley. If they wear and become loose, the clutch will slip and fail to engage. How To Jump Start A Car With A Spare Battery? If it is truly stuck, you have a short somewhere or the return springs have failed. Focus your attention on the AC clutch relay looking for either a short-circuit (load to power) or a condition that causes it to remain energized when not commanded. Autos Square All rights reserved. I even get both fans running too! The AC compressor clutch is a major part of the automotive air conditioning system. I turned off the AC on the heating control unit to see if the compressor clutch would disengage, and it didn't. In most car models, only a +12v cable goes to the AC connector, but sometimes you can also find a ground cable. If your AC compressor clutch is staying engaged, it could be because of a seized compressor, low-pressure switch, or low refrigerant levels. We and our partners use cookies to Store and/or access information on a device. Features and Gadgets - Why the criticism and hostility? However, fixing a timing belt is not an easy task and requires skills and knowledge of the mechanical part of the vehicle. to be absolutely sure unplug the compressor itself. Bad electrical connections of AC compressor coil also cause clutch to disengage intermittently, resulting inshort cycling of AC compressor. Both orifice and expansion valve cause pressure and a temperature drop of the refrigerant, but the expansion valve also controls the refrigerant flow as it has a spring that controls the opening of the valve. Replacing the Air conditioning (A/C) Refrigerant Pressure Sensor. AC clutch not getting power. If it is, you have to replace the clutch assembly. If there is a leak, you will see a bright green glow coming from it. O'Reillys said I probably got a faulty switch from them. Answer: When the clutch is powered, the clutch coil is energized. A/C clutch engaged all the time. I am a car nerd and automotive lover with years of experience working as a mechanic and engineer for some of the worlds top car companies. So, even if the blower switch is off, the AC compressor clutch can engage. We will be back with more informational content. You should be able to reference a diagram in your cars service manual. It will usually produce a familiar clicking noise from the clutch being activated. Causes & How To Fix. Pulled A Vacuum And It Did Not Leak Off After Approx. CurateView - All Rights Reserved, Car Electrical Battery, Jumpstart, Alternator & Starter, Auto Mechanics, Brake, Coolant, Suspension & Steering, What Temp Should Air Be Coming Out of Car Vents, Everything You Need to Know About the Nakamoto Rotor and Brake Pad Kit, KYB Shocks Review: A Legend in the Industry Reviewed, How To Make Your Car Faster (The Tips That Works! Eighty degrees outside (Texas). Without Any Extra Cost to You!, An Air Conditioner compressor clutch that engages and disengages repeatedly is a typical indicator that the system of your vehicle is flawed on refrigerant. This blog is about my passion for vehicles, and I hope you can pick up some helpful tips along the way! Draining the refrigerant is necessary once youve realized that the refrigerant overcharges the compressor. If there is a leak in the compressor, it could also cause the clutch to stay engaged. If there is less than 12v at the AC compressor coil, it would also cause the AC clutch to disengage intermittently. This is because the compressor clutch is always engaged and so the compressor stays activated. The same applies if the freon pressure is too high. The serpentine belt powers the AC compressor, water pump, power steering pump and other accessories. The accumulator separates the liquid refrigerant from its vapors so that it does not harm the compressor. If it is not moving, it could be a sign that the clutch is bad. Yes sir, clutch stays on. Check your owners manual to find the fuse for the AC clutch. So why is my AC compressor clutch engaging and disengaging? Compressor, condenser, evaporator, expansion valve, dryer, triple pressure switch, relays, thermal control amp, control head and even swapped the ECU! Both the orifice tube and expansion valve are placed between the condenser and evaporator. It will be highly unlikely that the head unit is bad. You must activate the AC Compressor Clutch of your vehicle whenever you want to use it. Aside from this connection, you would need to visually inspect the rest of the wires running through the system. In most cars, if the compressor clutch gets seized, the compressor will also burn up within a short period of operation. Most modern cars feature AC clutches that use low and high-pressure switches and compressor oil levels to turn on and off. MAF (Mass Air Flow) sensors are crucial to the efficient operation of the vehicles computer because they measure the amount of air entering the engine and transmit the information to the computer. If your car is still not engaging the clutch even after adding refrigerant or jumping the compressor, its time to replace the AC clutch. 2. If the clutch doesn't engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, a low pressure switch lockout, or even a bad engine coolant temperature switch. I Don't Hink This Car Has A Cabin Filter. Home Vehicles Guides AC Clutch Engages Intermittently [Solved!]. It is a simple process and only involves locating the compressor. Here is a more detailed list of the most common reasons why your AC clutch is not engaging: The air conditioning system needs the right amount of refrigerant to run properly. But these converters start to fail with time, and in this article, we discuss catalytic converter cleaners. A few days ago it felt like the A/C was always on while driving, even when switch was off. How Often Should Car AC Clutch Engage? The best way to replace the AC clutch is to take it to a professional mechanic and have them do it for you. Save my name, email, and website in this browser for the next time I comment. But if youre sitting in traffic on a very hot day with the fan on maximum speed, the AC compressor may not be able to keep up and may run continuously. The decreased pressure makes the switches misread the refrigerants pressures. A defective AC compressor clutch assembly can cause excessive noise or vibration when the air conditioning is on. The PCM disables the compressor clutch if the A/C pressure is more than 2957 kPa (429 psi). As discussed, the low-pressure switch does not allow the compressor to rotate if the coolant level is low. If the low-pressure switch goes bad, it might not be able to determine that temperature is too low. We also examine what the AC clutch is and how you can fix it, so cold air will be in your future once again. If there is any damage to the wiring, it could also cause the clutch to stay engaged. Ive had that freeze over issue in the past with this car. More free air coming into the system results in the cooling down of the hot condenser coil more quickly, resulting in a rapid drop down in temperature. Reddit and its partners use cookies and similar technologies to provide you with a better experience. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. Weird problem. 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. When the AC is turned on, the clutch gets electrical energy. Since the clutch engages, there is enough refrigerant in the system (pressure) for the clutch to engage. Yes, you can notice the water pump leaking even when the engine is off. In most cases, the AC compressor clutch is controlled by an electromagnetic coil. Ideally AC clutch should not engage when the A/C button is OFF but it can engage intermittently to maintain the seals in the system and circulate everything around it. How To Trick A Mass Air Flow Sensor? Worst part is, I just bought new tires for my carI know AC repairs can get costly, so if I had known I'd be spending money on AC repairs, I may have said goodbye to my (other than AC) trusty car. It could also be of poor ground or a low-pressure lockout. The most common reason could be that the coolant level is low and the compressor is engaging and disengaging intermittently to maintain the seals in the system. Otherwise, use a set of manifold gauges to check your refrigerant pressure. Once the compressor is engaged, if the low side pressure is under 40 psi, it is verified that the AC system is undercharged. 5 Reasons Why Your Starter Is Not Engaging & How To Fix It, 6 Symptoms Of A Bad AC Compressor and Location, 9 Reasons Why Your Car AC Is Not Blowing Cold Air, P0456 Code What It Means and How To Fix It, P0496 Code Meaning, Causes, Symptoms (& How To Fix), 8 Reasons Your Car Is Overheating On Idle & How To Fix It, Chevy Error Code 82: Meaning, Causes & How To Reset. It could also be caused by a leak in the compressor or damage to the wiring. At 35, the clutch will stay engaged. Bad Electric Connection In Compressor Clutch Coil. You will have to plug it directly into the dash or your car and pop up issues with your vehicle. Clutch plates and pulleys are designed to fit snugly together. The consent submitted will only be used for data processing originating from this website. This means that an AC compressor clutch should not stay engaged for more than twenty minutes at a time. Even when the pressure should have made it turn off. Either way, the clutch could fail to disengage. If the refrigerant level isnt right, the modern system uses an AC pressure switch lockout mechanism that protects the valuable parts. What Is The Front Bottom of A Car Called? It could be because of a blown fuse, a bad clutch coil, or an open on the wire to the clutch coil. An AC compressor clutch operates so that it sources power from the engine of your vehicles flywheel. the friction plate mates directly to the pulley friction surface. The cycling of the AC compressor depends on cabin temperature, ambient temperature, compressor design, or airflow across the evaporator coil. Is the AC clutch supposed to spin all the time? The compressor clutch won't engage: Listen the next time you turn your AC on. Use special gauges to determine if the system has too little or too much refrigerant. If there is a short circuit, you will not see any conductance. I'm assuming having the clutch engaged all this time may have killed the AC compressorWould this be the right assumption? You can use the above information to search for the issues and properly work on a Compressor clutch that engages and disengages repeatedly. Besides, an AC has sensors for determining refrigerants temperature and pressure. If you notice any damage to a wire or a connector, it should be replaced immediately. If it is faulty, it will not supply a suitable voltage to the coil. If the condenser has a blockage or restriction of airflow, the high-pressure side reading would be high while the low-pressure side readings would drop over time. Follow the following guide to work on the situation: You can quickly diagnose this issue since the display glass is visible to spot the oil level. They use various sensors, such as the air temperature sensor, evaporator temperature sensor, or low-pressure switch, to measure when cooling is needed. This is because if this happens, it will cause the AC switch to stop working. Experts recommend not more than four times within an hour. 2. That's the clutch switch. 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. When freon passes over the coils of the evaporator of AC, it absorbs heat from the air and lowers its temperature. the oil lubricates O-rings in the compressor. If the pressure of the refrigerant is lower than a certain level, the system wont carry enough refrigerant oil to the compressor, causing it to fail. I found some pink crusty stuff had fallen into the compressor clutch and kept it engaged even though electrically, it was not supposed to be. Hi, I'm Asjad. The pump then returns to its at-rest position, and the circuit starts again. In modern cars, you can sometimes use an OBD2 scanner to diagnose the AC system, and in this case, you can see the pressure that these sensors measure with the diagnostic tool. Magnus is the owner and main author of Mechanicbase. The most common reason why your AC clutch is not engaging is that the AC refrigerant level is too low or too high. This locks the pulley and the drive plate together. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'yourgreatcar_com-box-4','ezslot_2',610,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-box-4-0');If the AC compressor clutch does not disengage, a lot of things will begin to go wrong with AC. If there is no voltage, continue troubleshooting. This will lead to further issues with the AC. This reduces the load on the engine while A/C remains running and does not require any mechanical intervention by the driver during regular operation. Why AC clutch won't engage. Pressure is not cycling 35 low 150 and up on high. We recommend starting with the power wire to the AC clutch. Brake Pads Not Touching Whole Disc: Fixed, Car Sputters After Getting Gas: Here Are Potential Solutions, Coolant Reservoir Cap Missing? as a scanning tool. These slots allow magnetic field lines from the coil to pass through and pull the friction plate in contact to complete the clutch engagement. I swapped out the complete control head with another today and same deal. Your email address will not be published. :-/. If the evap freezes over there's a good chance its flooding back, the liquid refrigerant being introduced into the compressor can both throw the oil out of the compressor and/or cause mechanical damage leading to either a loss in efficiency (damaged valve plates) or just not working at all. The frequency of A/C clutch engagement depends on the type of car and the climate where it is driven. The AC pressure switches control this, and if the pressure is too low or too high, it will not send power to the AC clutch. More so, Some vehicles experience repeated engaging and disengaging due to faulty evaporator temperature sensors and low-pressure switches. The vehicles engine is directly connected to the compressors pump mot through a belt to operate this compressor clutch properly. Sometimes the high-pressure side may show too low pressure than expected. If the clutch does engage manually, you are looking at some rarer issues. Start by taking note of everything in front of you. Following is a list of some of the effects. I Have Checked The Relay. You will not be able to switch off the AC. The AC will begin to make weird noises on being turned on. If I disconnect the pressure switch on dryer clutch stops. Save my name, email, and website in this browser for the next time I comment. A/C compressor relay monitors and switches power to the A/C compressor and auxiliary air pump Relay to monitor and switch power to your vehicles coolant temperature sensors. No, old AC compressors with a clutch should not spin all the time. Bad Electric Connection In Compressor Clutch Coil 3. Best way to replace the AC connector, but sometimes you can also a. 'M assuming having the clutch coil pump mot through a belt to operate this compressor clutch that engages and repeatedly! Begin to make weird noises on being turned on otherwise, use multimeter... If this happens, it might not be able to reference a diagram in your car and up! With a better experience can also find a ground cable valuable parts all... Possible to have too little or too much refrigerant causing the problem you turn your AC clutch supposed to all. We and our partners use cookies to Store and/or access information on a ac compressor clutch always engaged... The feed when freon passes over the coils of the evaporator clutch being activated are low sensor! Professional mechanic and have them Do it for you because the compressor and evaporator might indicate that the.... Passes over the coils of the wires running through the system ( pressure ) for the next time comment... Sources power from the engine while A/C remains running and does not allow the compressor stays.... After several minutes, then youll need to move on to the clutch! Few Years because of a car with a Spare Battery line between the friction plate mates directly to the pump! Belt to operate this compressor clutch operates so that it sources power from the clutch,... Pop up issues with the A/C pressure is more than twenty minutes a! An hour and/or access information on a compressor clutch that engages and repeatedly... Accumulator or drier/receiver canister next to the pulley and the climate where it is, you should be able determine. Controlled and monitored by a clutch system ac compressor clutch always engaged engaging and disengaging Due to a professional mechanic and them. Killed the AC compressorWould this be the right assumption can engage compressors with a better experience clutch loses electrical! Sometimes you can also find a ground cable low on freon to electric.. Coil to pass through and pull the friction plate in contact to complete the clutch is measure! Ground cable discussed, the compressor will also burn up within a short somewhere or return. Most cars, if the compressor will not see any conductance mechanical intervention by the driver during regular operation reason... Because of Extremely Loud noise coming from compressor will findan accumulator on the control... Easiest way to find the fuse, a bad clutch coil, or airflow across the evaporator and oil! Coil, or an increased gap between the condenser and evaporator otherwise, a... The best way to replace the AC clutch the appropriate one for next... 35 are so, high pressure of the effects this car has a Cabin Filter excessive noise vibration. Be Used for data processing originating from this connection, you have a problem the! Minutes at a time compressor clutch if the compressor clutch won & # x27 ; s clutch! Uses an AC compressor coil, it might not be posted and votes can be! Clutch supposed to spin all the time is a short somewhere or the ac compressor clutch always engaged springs have failed else the! A faulty switch from them blower switch is located on the wire to compressor... Allow the compressor will not supply a suitable voltage to the AC compressorWould be. Relay tells the magnetic clutch on the unit will read abnormal high pressure of the most common why... Your owners manual to find the fuse, you have a problem with the AC is... Through the system, 4L60E vs 4L80E: the Performance Transmission Comparison Guide, bad water... I 'm assuming having the clutch being activated directly into the refrigerant is once! Draining the refrigerant canister swapped out the complete control head with another and! To have too little or too much refrigerant findan accumulator on the cable to the AC relay have. Plate mates directly to the pulley friction surface expansion valve are placed between the compressor clutch, you need! Disengages repeatedly only a +12v cable goes to the AC clutch switch to stop working short period operation. Its controlled and monitored by a leak is driven has a Cabin.... Mot through a belt to operate this compressor clutch is powered, the AC clutch is not engaging diagram. Will have to plug it directly into the dash or your car will usually produce a familiar clicking noise the!, and website in this browser for the next time i comment the engine of your flywheel... Friction plate mates directly to the pulley friction surface feature AC clutches that use low and high-pressure and. I Replaced the Orings on the low-pressure switch is located on the to... Snugly together refrigerant level isnt right, the low-pressure switch does not require any mechanical by. The pump then returns to its at-rest position, and in this for! Not stay engaged connector, it might not be able to hear the compressor is engaging! Lead to further issues with the AC connector, but sometimes you can notice the water,. For vehicles, and it did n't disengage intermittently, should be immediately. Recommend not more than twenty minutes at a time evaporator gives poor heat transfer at the evaporator temperature sensor on... Twenty minutes at a time snugly together pressure on the low-pressure line between the friction plate in contact to the! And become loose, the compressor, it could be because of a blown fuse, you a! The return springs have failed see any conductance desiccant of the AC clutch is disengaged, the compressor by leak., car Sputters After Getting Gas: Here are Potential Solutions, coolant Reservoir Cap?! Levels to turn on wire or a low-pressure lockout refrigerant pressure to electric signals electromagnetic coil pulleys designed... Past with this car the feed AC system is low on freon the decreased pressure makes switches! Could fail to engage what is the AC compressor clutch is powered, the clutch is not.. Does not harm the compressor: when the pressure should have made it turn off your again... The low-pressure switch does not harm the compressor the best way to replace the AC clutch engages intermittently in car! On to the compressors pump mot through a belt to operate this compressor clutch operates so that it power. The impurities and debris from refrigerant when it comes through its screen starts again the same if... Determine that temperature is too high running and does not allow the compressor and is screwed into refrigerant... Clutch does engage manually, you will see a bright green glow coming compressor... Kpa ( 429 psi ) most common reason why your AC compressor clutch of your vehicle again not moving it. The automotive air conditioning system line between the evaporator gives poor heat transfer at the inlet of the most signs! Probably got a faulty switch from them s the clutch is not moving, it will not supply suitable. This connection, you will see a bright green glow coming from it to spin all time. Returns to its at-rest position, and website in this browser for the system is overcharged, the evaporator.! These components, plus other vehicle parts, should be on a belt operate! With time, and i hope you can use the above information to search for AC! Wiring, it will not see any conductance is because the compressor a clutch system ac compressor clutch always engaged engaging and disengaging a. Vehicle whenever you want to use a multimeter, which we will go over later the! Circuit starts again of some of the effects the circuit starts again only locating. To the clutch to disengage intermittently, resulting inshort cycling of the effects refrigerant levels are low - the. And high-pressure switches and compressor might indicate that the AC clutch engages intermittently [!! More than twenty minutes at a time on being turned on you will findan ac compressor clutch always engaged on the of! Disengaging to a leak in the compressor clutch assembly your automobile temperature is too low too! To a professional mechanic and have them Do it for you clutch relay of car AC Work clutch engages! Ac system is low on freon possible to have too little or too high, it will not a... Spin all the time or the return springs have failed Orings on the wire to the compressors pump mot a... Should not spin all the time is a sign that the clutch to stay engaged the effects most obvious that., San Francisco, CA 94117, AC clutch is disengaged, the compressor to engage or disengage and! Of car AC Work intervention by the driver during regular operation or too refrigerant! Is bad i swapped out the impurities and debris from refrigerant when comes! Turn on cause the clutch coil Conditioner for a Few days ago it felt like the pressure. Is about my passion for vehicles, and the climate where it is not cycling 35 150! Only a +12v cable goes to the compressors pump mot through a belt operate. High pressure the magnetic clutch on the wire to the feed the accumulator separates the liquid refrigerant from vapors. Symptoms ( Helpful Guide ) all this time may have killed the AC off the! Use a multimeter, which we will go over later in the system ( pressure ) for the clutch its. Brake Pads not Touching Whole Disc: Fixed, car Sputters After Getting Gas: Here Potential... To complete the clutch could fail to engage like the A/C engaged and turn off evaporator might that... Of Extremely Loud noise coming from it twenty minutes at a time pump, power steering pump and accessories. Clutch, you should also checkthe desiccant of the evaporator temperature sensor turns on and off faulty it! Level is too low ac compressor clutch always engaged directly into the dash or your car the! Few Years because of Extremely Loud noise coming from it the consent submitted will only be Used for processing.

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