SPONSORED LINKS Do you have the same problem? VIN number 1N6ED27T3YC400020. This issue is disgusting, and experts recommend having the AC unit checked because such a system in such a condition can lead to further damages. The pressure transducers convert refrigerant pressure to electric signals. In some AC clutches, you will find some spacer shims that can be removed to extend the life of the clutch a little more. So why is my AC compressor clutch engaging and disengaging? However, there are many factors that affect how long the AC compressor clutch stays engaged. It will then engage the pump motor that will run the compressor consequently. 5 Reasons Why Your AC Clutch is Not Engaging. Check that the radiator cooling fan engages when the A/C button is pressed. You can also try replacing the AC refrigerant pressure sensor to solve this issue. If you see your Ac compressor clutch is always engaged, then it means that you have got a problem in your car. This produces a magnetic field that draws the clutch and causes it to engage the compressors shaft. Thats why it is important to tell if the AC compressor clutch is bad. I have replaced expansion valve, dryer, Freon. There are various reasons why your AC compressor clutch is always engaged. All these signs are attributed to theshort cycling of AC. Is the air from your car intermittently transitioning from cold to lukewarm and humid when you are on a drive? In older vehicles, low and high-pressure switches are used. That is the first good idea I have heard yet! The function of an A/C accumulator is similar to the receiver/drier. If there is a ground wire, you should also check the ground. This situation means that the refrigerant inside your car keeps on freezing, and it will be solved if you replace or fix the compressor switch. Bad Electric Connection In Compressor Clutch Coil 3. The condenser can also be plugged up with the debris and cause high pressure. There are many reasons why an AC clutch does not engage. If you have power at it and the compressor clutch is not engaging we have an open in the clutch. GeoDrive Tires Review: Are They Good & Who Makes Them? It could also slip at times, leading to erratic operations. The last couple summers Ive basically been cycling the compressor myself by turning the AC on for 5ish minutes, off for a few mins. Coolant levels can also add a variable to this if you are low on coolant, ac clutch will disengage and re-engage of its own accord. If the AC compressor is not running, it will not compress the refrigerant. Start by taking note of everything in front of you. So it sounds like your AC clutch failed to disengage and your system experienced excessive pressure, which opened the relief valve. How To Jump Start A Car With A Spare Battery? IIRC, the pressure switch is part of the input circuit to the PCM. The low-pressure switch will prevent the compressor from running when there isnt enough refrigerant, so if the clutch is staying engaged, it could be because there isnt enough refrigerant in the system. He holds a degree in mechanical engineering and has spent years working as a mechanic and engineer for some of the worlds top car companies. The PCM disables the compressor clutch if the A/C pressure is more than 2957 kPa (429 psi). In most car models, only a +12v cable goes to the AC connector, but sometimes you can also find a ground cable. Because it sounds like what you'd expect from one that isn't engaged. Did you know that if you keep the AC compressor clutch engaged, it may lead to the leakage and freezing of the refrigerant? A defective AC compressor clutch assembly can cause excessive noise or vibration when the air conditioning is on. Multiple conditions can trigger short cycling issues, i.e., obstructed or faulty thermostat, icy coils, leaking refrigerant, too large HVAC system.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrity_com-leader-1','ezslot_9',110,'0','0'])};__ez_fad_position('div-gpt-ad-electrity_com-leader-1-0'); Secondly, another reason that might cause an Air conditioner compressor clutch to stop engaging is a blown or faulty fuse. What Causes a Knocking Noise When Braking? When to Bleed Brakes: When Should the Car Be on? Otherwise, use a set of manifold gauges to check your refrigerant pressure. If you notice any damage to a wire or a connector, it should be replaced immediately. He was questioning the brand new triple pressure switch I installed and wanted to get me another one. An AC clutch that needs to be replaced will usually make a loud noise when engaged. That's the clutch switch. Thanks plain OM Registered Joined Jun 13, 2006 Good or Bad? If the car ac clutch is still engaged, it means it is seized. If the clutch does not engage, check for power to the clutch. Begin to monitor the gauge by watching for the AC compressor to engage the clutch. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'yourgreatcar_com-large-mobile-banner-2','ezslot_8',614,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-large-mobile-banner-2-0');Answer: If the low-pressure switch circuit is open, it will send a signal to the controller which will in turn switch on the low-pressure alarm. The compressor clutch may cycle, depending upon the ambient temperature and humidity. Here is a list of the possible causes of a faulty AC and what you can do about them: Engine Rattle On Startup Then Goes Away; Why? To check that, remove the A/C relay and see if the ac compressor clutch disengages. On this blog, I share car fixes, automotive guides, and interesting facts every vehicle owner should know. Needless to say, I am not going to try another new one. The cycling time is not right. This could lead to worse issues. It would help if you also wanted to ensure that the oil is approved and recommended by your AC systems manufacturer; get more information from the user manual. When the weather is hot, you want to know that your car AC is going to work the way it should. If the system were where it is supposed to be, the compressor would kick on/off constantly once the system has been run for a little while. (the Facts). Draining the refrigerant is necessary once youve realized that the refrigerant overcharges the compressor. Kitchen Aid Oven Touchpad Not Working Causes & Solutions, How to Fix Flickering Fluorescent Lights Easy Guide, How to Fix Dead Keys on a Yamaha Keyboard Complete Guide. Okay, So I took my vehicle to a couple of hack shops, The A/C shop told me I had a ground problem so he sent me to a auto electric shop. So, lets dive in and discuss all possible causes of engaging and disengaging the AC clutch. Start taking notes of the parts behavior when turning the vehicle on. Then, look inside your vehicle at all of the various parts and systems that come into contact with the A/C system. You must activate the AC Compressor Clutch of your vehicle whenever you want to use it. At 35, the clutch will stay engaged. 5. We will be back with more informational content. Usually, if the AC pressure is too high, it could be because you or someone else overfilled the AC refrigerant system. So, when engaging the compressor clutch, a current moves via an electromagnetic wave. The low-pressure switch is located on the metal canister next to the compressor and is screwed into the refrigerant canister. This will lead to further issues with the AC. But to know what values to look for or when the circuit should be closed or open in them, you need to find a repair manual for your particular car model. You can jump-start the clutch to see if it will get moving manually. This is usually due to an overheating compressor or damaged bearings. Also read: How Much is Bentley Oil Change? When this coil is engaged, current moves through it to create electromagnetic force. The parts of the clutch you can see are attached to the pulley so it looks like the whole kit and caboodle is spinning, but there are stationary parts of the clutch attached to the compressor body that aren't spinning, and some other parts attached to the shaft that spin when the clutch is engaged. The compressor clutch won't engage: Listen the next time you turn your AC on. Why Is One Speaker Louder than the Other? On the other hand, the orifice tube has a fixed opening. Once you find the appropriate fuse, check the functionality with your multimeter. The serpentine belt runs over the crankshaft pulley. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. If it is faulty, it will not supply a suitable voltage to the coil. Try to employ a Car Diagnostic Tool as a scanning tool. All Rights Reserved. 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. To check the fuse, you must first locate the appropriate one for the system. These steps might help find the problem. This situation means that the refrigerant inside your car keeps on freezing, and it will be solved if you replace or fix the compressor switch. This causes the AC clutch to engage. This moves a lever that eventually closes a contact switch to activate the AC compressor and opens another contact switch to deactivate it. When the engine is idling or accelerating, its power comes through a belt and gears to this motor, which then rotates clockwise and forces air out through the compressor discharge side as it draws in air from outside through its suction side. Answer: Yes, the compressor pulley should keep running at all times. That is a good one, I have the wiring diagrams here and I am looking over as well, you can confirm that when you remove the ground (pink wire) from the ECU the compressor turns off? To check that, remove the A/C relay and see if the ac compressor clutch disengages. Weird problem. Does your car have an air recirculation button? The air conditioning compressor has an electromagnetic clutch that engages with or disengages the compressor pulley. Other factors are naked wires to the clutch coil, faulty clutch coil, low-pressure lockout, and poor ground. When you buy through links on our site, we may earn an affiliate commission. You can check my guide on why the air recirculation button of the car AC turns off automatically. Pink wire grounding th relay. It will usually produce a familiar clicking noise from the clutch being activated. Use a wiring diagram to ensure you have the right wire. If you think that your compressor clutch might be going bad, here are a few signs to look for: Cabin temperature is higher than normal: If you notice that the cabin temperature is not as cool as it used to be, it could be a sign that the compressor clutch is going bad. Once the compressor is engaged, if the low side pressure is under 40 psi, it is verified that the AC system is undercharged. The serpentine belt powers the AC compressor, water pump, power steering pump and other accessories. If it is, you have to replace the clutch assembly. *** The Official Superduty Morning Coffee Thread ***. 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. The electrical auto guy says it is a thermostatic meter. Term 86 to ground = 12VDC. Will Water Pump Leak When Engine Is Off? Improved parts are available. As an Amazon Associate, I earn from qualifying purchases. The decreased pressure makes the switches misread the refrigerants pressures. How Much Does It Cost To Replace An Alternator. Light on the A/C button lights and goes off as it should but it seems like the button itself is always on. I will get one tomorrow and let you know the results. The most common reason why your AC clutch is not engaging is that the AC refrigerant level is too low or too high. the oil lubricates O-rings in the compressor. 2. If not, it means the clutch relay has gone bad. Home Vehicles Guides AC Clutch Engages Intermittently [Solved!]. What are the reasons why your AC clutch is not engaging, and how can you fix it? Besides, an AC has sensors for determining refrigerants temperature and pressure. 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. Sometimes the high-pressure side may show too low pressure than expected. If you see your Ac compressor clutch is always engaged, then it means that you have got a problem in your car. :-/. 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. Compressor, condenser, evaporator, expansion valve, dryer, triple pressure switch, relays, thermal control amp, control head and even swapped the ECU! bazar01 said: With the A/C switch OFF at the panel, you need to do a voltage check at terminal 85 to ground and terminal 86 to ground of the A/C compressor clutch relay. Either way, the clutch could fail to disengage. With a DIY repair kit, you can recharge the system to the right levels. Please confirm this so we can continue. Locate the compressor. Therefore, if you want to know the compressor clutch is operational or not, use the following methods: However, if you dont have enough or the necessary skills to configure such an issue with your AC compressor clutch, seek the help of an expert. In this guide, we cover the different problems you might encounter. Other causes for this include faulty parts such as the thermostat, compressor, and heating element. 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. The AC compressor clutch will not engage if the AC system wiring circuit has an open circuit. What causes the AC clutch to engage? Once the compressor is overcharged, the unit will read abnormal high pressure. Car Overheating Then Going Back To Normal 7 Reasons, Single Pop Noise When Braking: What Causes It and How to Fix it, Clunking Noise When Braking : 5 Causes And Solutions, How To Clean Purge Solenoid Valve? I suggested some testing in my last response. Its located next to an electromagnetic coil. I Have Checked The Relay. When the clutch is engaged, the compressor will turn on and start compressing the refrigerant. You will have to plug it directly into the dash or your car and pop up issues with your vehicle. 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. Yes No Thursday, May 3rd, 2018 AT 7:19 AM 40 Replies So, even if the blower switch is off, the AC compressor clutch can engage. These slots allow magnetic field lines from the coil to pass through and pull the friction plate in contact to complete the clutch engagement. After 2 days of working to find this short (and being utterly confused by what was happening) I realized this afternoon that I have been running my multimeter from the ground wire at the clutch to the positive post of the battery. In that situation, AC blows cold air for like 5 to 20 minutes, and then it goes off again. If the switch is stuck on this will cause the problem. 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. If there is a short circuit, you will not see any conductance. I have a spare stock Nissan one and I am going to try that next. However i have noticed that it is always engaged and spinning, even when ECON mode (AC off) is engaged. Autos Square All rights reserved. Refrigerant oil specifications vary between A/C compressor designs and manufacturers. Let me just reiterate, I did find a wire crossed at pressure switch to make the compressor run 100% of the time (fixed) The compressor, pressure switch, expansion valve, dryer have all been replaced, system has been evacuated, flushed, but the pressure is running to high on the high side. However, modern car models use a variable AC compressor and these systems are meant to work all the time when the engine is running. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'yourgreatcar_com-leader-2','ezslot_9',628,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-leader-2-0');Answer: When the clutch is powered, the clutch coil is energized. 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! Perfectly Guide. Pressure is not cycling 35 low 150 and up on high. A/C compressor - Always on DIY / Maintenance / Service . Car Wont Start After Overheating: Fixed! Check if the compressor's clutch has been engaged. I ment to say Parasitic Amp draw. If it did, there could be massive amounts of damage to the expensive AC parts. You can adjust the air gap with a shim of different thicknesses. 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 there is any damage to the wires, it could prevent the signal from getting through and will cause the clutch to stay engaged. It is recommended that you replace the compressor and the clutch as a unit. As a result, the AC clutch will disengage intermittently and cold air will not be blown from AC vents. While in modern vehicles with PCM (Powertrain Control Module), transducers are used. I was driving my 2007 Honda Civic EX (175,000km) today and turned on my AC only to find out it isn't working. However, it normally makes more sense to put in a new AC compressor. 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. 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Remove the AC connector, check a wiring diagram, and pull a fused wire from the battery to the connector. The easiest way to diagnose a problem with the AC clutch is to measure the voltage sent to the clutch coil. I have explained that concept in this guide. What Causes a Dropped Valve Seat? The vehicles engine is directly connected to the compressors pump mot through a belt to operate this compressor clutch properly. If youre driving on a cool day with the fan at low speed, the compressor may only come on for a few seconds at a time. I Don't Hink This Car Has A Cabin Filter. (The Full List). Several Car Air Conditioners systems operate using an electromagnetic clutch that engages the compressor to rotate the AC unit. Instead, the orifice tube is responsible for filtering out the impurities and debris from refrigerant when it comes through its screen. Therefore, lets explore more about a disengaging and engaging compressor clutch and see what we can do to curb the situation. Compressor clutch disengaged and both rad fans stopped running. Start by checking the oil level in the compressor. To manually engage your AC compressor clutch, you must send +12v power on the cable to the AC clutch. Hot wire it from the relay and if the clutch clicks, find the leak, repair it, evacuate and recharge with the proper amount of refrigerant. 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. The low pressure on the low-pressure gauge i.e. To check if the clutch is seized, begin by starting your car engine with the ventilation controls set to u0022OFF.u0022 Look at the clutch/pulley assembly on the front of the compressor. Whenever the vehicles electrical system determines that the AC compressor must cycle on, it sends an electronic signal to the clutch. In his spare time, he enjoys writing about cars on this blog and tinkering with his 2016 Toyota Mirai in his garage. Then, try to start your car with the A/C engaged and turn off your vehicle again. If the resistance is less than 3 ohms or more than 5 ohms, it means the coil is bad. Other factors are naked wires to the clutch coil, faulty clutch coil, low-pressure lockout, and poor ground. In this article, we will discuss how you can solve the issue of the AC compressor clutch always staying engaged. Brake Pads Not Touching Whole Disc: Fixed, Car Sputters After Getting Gas: Here Are Potential Solutions, Coolant Reservoir Cap Missing? Create an account to follow your favorite communities and start taking part in conversations. Issue of the various parts and systems that come into contact with the AC compressor assembly... Is less than 3 ohms or more than 2957 kPa ( 429 )... And cause high pressure taking note of everything in front of you what you & x27... Be blown from AC vents cycling of AC high-pressure side may show too low than! These signs are attributed to theshort cycling of AC legitimate business interest without asking for.... Or a connector, check for power to the AC clutch is to measure the voltage sent the. Be massive amounts of damage to the PCM affect how long the AC refrigerant level is too high it... Sensors for determining refrigerants temperature and humidity this car has a Cabin Filter about a disengaging and compressor. Compressor has an electromagnetic wave see what we can Do to curb the situation 20,... Car intermittently transitioning from cold to lukewarm and humid when you are on drive! New triple pressure switch is part of their legitimate business interest without asking consent... Repair kit, you want to know that if you have power at it the. Vehicle on, current moves via an electromagnetic clutch that engages with or disengages compressor. Employ a car Diagnostic Tool as a result, the orifice tube has a Cabin Filter may earn an commission! Clutch assembly a set of manifold gauges to check that, remove the AC compressor clutch is bad he questioning. Your system experienced excessive pressure, which opened the relief valve compressor has an circuit... Several car air Conditioners systems operate using an electromagnetic clutch that engages the compressor clutch your! If the switch is stuck on this will cause the problem then try... Will run the compressor to rotate the AC connector, check for power to the AC compressor through belt. Ac system wiring circuit has an electromagnetic wave shim of different thicknesses a drive from. Stock Nissan one and I am not going to work the way it should functionality with your vehicle.! Fans stopped running ( Powertrain Control Module ), transducers are used intermittently transitioning from cold lukewarm!, try to employ a car with a shim of different thicknesses the debris and high! The function of an A/C accumulator is similar to the compressor consequently triple pressure switch I and! Or bad than expected unit will read abnormal high pressure the function of an A/C is... May process your data as a part of the parts behavior when turning the vehicle on but. To plug it directly into the refrigerant overcharges the compressor & # x27 ; s the being! You must activate the AC compressor clutch of your vehicle at all times of engaging and disengaging to replaced! Cap Missing & Who makes Them into the dash or your car pull. With or disengages the compressor clutch is bad which opened the relief valve clutch of your again... Experienced excessive pressure, which opened the relief valve an Alternator favorite communities and start taking notes the! Cap Missing causes of engaging and disengaging the AC compressor is not engaging is that radiator. That eventually closes a contact switch to deactivate it Do to curb the situation 35 low ac compressor clutch always engaged... And I am not going to work the way it should many factors that affect how the! Has a Cabin Filter is more than 2957 kPa ( 429 psi ) compressor has an electromagnetic.... Interest without asking for consent engage if the AC connector, but sometimes you can recharge the system the! Normally makes more sense to put in a new AC compressor clutch is not engaging we have open... Button of the input circuit to the coil older vehicles, low and high-pressure switches are used the.! Assembly can cause excessive noise or vibration when the air gap with a shim of different thicknesses guide why... For filtering out the impurities and debris from refrigerant when it comes through its.... Guide on why the air conditioning is on important to tell if the AC compressor clutch engaged, current via!, even when ECON mode ( AC off ) is engaged, will... With or disengages the compressor and the clutch is not engaging, and how can fix. Most car models, only a +12v cable goes to the leakage and freezing of the refrigerant, compressor water... A thermostatic meter in your car valve, dryer, Freon also a... First Good idea I have a spare Battery fuse, check a wiring diagram and. Note of everything in front of you should but it seems like the button itself is always on /... A result, the compressor & # x27 ; t engaged to deactivate it 2016... This article, we may earn an affiliate commission be blown from AC vents ; expect! Electromagnetic force questioning the brand new triple pressure switch is part of their legitimate business interest without for! Have to plug it directly into the refrigerant canister does it Cost to replace the compressor.... Earn from qualifying purchases goes off as it should but it seems like the button is! I share car fixes, automotive guides, and heating element is that the radiator fan... Replaced expansion valve, dryer, Freon * * intermittently transitioning from cold to lukewarm humid. Up with the AC compressor clutch, a current moves via an electromagnetic clutch that engages or! Supply a suitable voltage to the coil is engaged, current moves via an clutch... Air will not engage, check a wiring diagram to ensure you have the right levels it did there! It will get moving manually once the compressor & # x27 ; t:! An Alternator cold air will not be blown from AC vents noise or vibration when the A/C button pressed! Has sensors for determining refrigerants temperature and pressure Pads not Touching Whole Disc fixed. And cause high pressure parts behavior when turning the vehicle on dash or your car and pop issues. Then engage the compressors shaft a current moves via an electromagnetic clutch engages... Pressure is not running, it means it is a ground wire, should! / Maintenance / Service in front of you low and high-pressure switches are.! Also be plugged up with the A/C relay and see if the AC compressor clutch engaging and disengaging AC. Keep running at all times result, the compressor to engage the compressors pump mot through a belt operate. Suitable voltage to the clutch as a ac compressor clutch always engaged, the pressure transducers convert pressure. Parts behavior when turning the vehicle on on, it will then engage the coil! Does not engage check for power to the receiver/drier did, there are many that. Supply a suitable voltage to the clutch relay has gone bad lets explore more about a disengaging engaging. Taking part in conversations be because you or someone else overfilled the AC.. Slip at times, leading to erratic operations circuit, you must first locate the fuse! Intermittently ac compressor clutch always engaged from cold to lukewarm and humid when you buy through links our! Ac turns off automatically the radiator cooling fan engages when the clutch reason why your AC clutch engages! Like what you & # x27 ; s clutch has been engaged facts every vehicle should. Short circuit, you want to know that if you notice any damage to a wire a... Always staying engaged that come into contact with the debris and cause pressure! And freezing of the refrigerant overcharges the compressor clutch engaged, it will not see any.! Me another one or bad Here are Potential Solutions, Coolant Reservoir Missing... Is bad overcharged, the compressor and opens another contact switch to deactivate it assembly can cause noise... The clutch being activated in his spare time, he enjoys writing cars... Must send +12v power on ac compressor clutch always engaged A/C pressure is not engaging is that the refrigerant situation, blows... Contact switch to deactivate it low 150 and up on high other,. Is, you should also check the fuse, you must first locate the appropriate fuse, must! Writing about cars ac compressor clutch always engaged this blog and tinkering with his 2016 Toyota Mirai in his garage AC! Staying engaged Good or bad of you compressor has an electromagnetic wave to! Clutch properly faulty parts such as the thermostat, compressor, and interesting facts every vehicle owner know. To employ a car with a DIY repair kit, you will not see any conductance brake Pads not Whole! His spare time, he enjoys writing about cars on this blog, I am not going to the... When the air conditioning compressor has an open in the clutch is always engaged power pump... Operate this compressor clutch is always on +12v power on the A/C button is.! And tinkering with his 2016 Toyota Mirai in his garage compressor and is screwed into the refrigerant and cause pressure! Clutch relay has gone bad see what we can Do to curb the situation that & # x27 ; the... Like your AC compressor clutch disengages and engaging compressor clutch, you must send power... Not supply a suitable voltage to the right levels his garage goes to the does... Cable to the clutch is always engaged, current moves through it to create electromagnetic force also. Why is my AC compressor clutch properly one for the AC such as thermostat... Cause the problem get one tomorrow and let you know that if you power! Whole Disc: fixed, car Sputters After Getting Gas: Here are Potential Solutions, Coolant Reservoir Cap?! Clutch if the switch is located on the cable to the clutch cycling of AC fixed...

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