My AC isnt working, the clutch wont engage. The AC compressor clutch will not activate when plugged into the original harness, even though power is coming from the dash switch. If the engine was running and the clutch was engaged, the compressor was pumping. Everything You Need To Know! An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. Is there anything else I should try before I bring it to a shop? Moreover, because of being passionate to learn about the recent happenings in auto industry, he doesn’t only provide great car maintenance tips, he also always updates latest trends in among car brands and share them in his own interesting viewpoint. Examine the A/C clutch with a flashlight. I was playing with the headlights switch and I started to feel nice cold air then I stop to visually check and sure enough the compressor was working. Unplug the compressor connector. How to test the compressor clutch relay. how to manually engage ac compressor clutch, The 7 Best Car Batteries For The Money in 2021. Check for a tight fit of the field coil retaining snap ring. If you want to diagnose an AC compressor clutch for defects, apply these techniques: Working Method 1 Set all air conditioning controls to the MAX before kicking off the engine. Today when I was coming back home from work the AC worked. Sadly at over 400 mega ohms the clutch coil has failed. I read somewhere that a guy bought a used compressor and just used the clutch but that was one guy. The AC clutch is the same basic design as an electric PTO clutch. Engaging the AC compressor clutch at home is not rocket science. Before checking to see if a clutch needs to be replaced, see if it is engaging and disengaging properly. … Nope just how to check the clutch electrically Using low-quality oil could be a reason for failing AC compressor clutch but it could happen even if you use synthetic oil and high-quality coolant. You have to jump-start it and the process won’t take more than a couple of minutes: Examine the oil level in the compressor. If they are bad, they should be replaced with a new compressor. How do you check AC compressor clutch to see if its bad. I made sure to check the other lead from the coil that is tied to the body of the compressor, that was in good condition mechanically. Normal current should be 3.6 - 4.2A at 12VDC. If you want to diagnose an AC compressor clutch for defects, apply these techniques: Set all air conditioning controls to the MAX before kicking off the engine. Set the AC to maximum cold setting. They don't want to sell clutches, just complete compressor units. The only way to modulate the pressure produced by the compressor was […] To check AC compressor clutch air gap, simply insert a feeler gauge between the clutch plate and pulley with the engine off. The compressor is usually located towards the front of your engine, just inside the grill of your car. Now you have to open the hood and examine the AC compressor. I cut past the break and exposed the wire to do a repeat test. If your car’s AC compressor clutch won’t engage and low side and high side pressures are within specifications, test compressor clutch coil. Compressed refrigerant moves through tubes and hoses to the drier and condenser. How do you check AC compressor clutch to see if its bad. When this component does not work properly, the engine does not get the cold air flow – leading to some major complications. Check for power AND ground to the compressor. The flexible, rubber isolators that allow the clutch disc to move in and out will melt from the intense heat, and the metal plates will appear rusty. If the circuit tests normal, test or replace the A/C clutch. Most car AC systems use an electromagnetic clutch element that engages the compressor to spin the air conditioning unit. Before I do, is there anything else you want him to know? Measure the current draw when the clutch is engaged. Tester. You will need a test light or power probe for this part of the testing. Use a wire crimp tool to install small connectors on the jumper wires that will plug into the compressor. A Open the hood and look at the air conditioning compressor. How to manually engage AC compressor clutch when the system is low on antifreeze? In these instances, replace the compressor assembly. Command … Release the clutch by removing the positive wire. When the coolant level in the system goes down, the low-pressure switch does not allow the compressor to rotate. As above, check the pressures in the system, and then see if the compressor clutch gets +12v when you engage the switch in the dash. It is bolted into place on the front of the compressor. The process is a bit different for older cars that are not compatible with the R134a type. Is There Honda Civic Si Automatic? Ran it this way for a few minutes, but it did not cool. Are Cars Designed to Fail At A Certain Point? how to manually engage ac compressor clutch. If the air gap is too wide, you may be able to correct it by using a different spacing washer. If the clutch coil shorts out, the positive wire may begin to heat when it touches the positive battery post. Check the front side of the clutch to examine its condition. An air conditioning compressor creates cool air by circulating refrigerant through your AC unit. You might see that under heavy acceleration, for example. I hear the clutch is part of the compressor unit and is not servicable. The compressor looks like a small motor with a large wheel on the end. Now to check if the clutch engages or not you will have to grab a lead to figure out this. Turn off the engine so that the moving parts … a) Overcurrent - Short circuit within field coil or in compressor circuit. If your AC isn’t working, there’s a good chance that a faulty compressor could be the culprit. Tsukasa Azuma is an awesome car blogger of Car From Japan. Rather, you will see friction of the belts. The AC compressor clutch is the first thing that moves every time you turn on your AC. Is the clutch coil getting current to it when you turn the AC on? The transmission should shift into gear without any grinding or … Keep it safely away from all other components. Condenser: Usually mounted forward of the radiator, the condenser looks like a thinner radiator. Any downside? Inadequate lubrication can damage the compressor. To check if the clutch is working properly or not, try using these methods: Turn on the air conditioning controls to maximum AC. The coil can open on occasion and once the wire breaks internally, its done until the clutch is replaced. (too much load on the engine?). I made sure to check the other lead from the coil that is tied to the body of the compressor, that was in good condition mechanically. Before buying anything check the AC compressor with the engine on as discussed later - Check to see if the AC clutch engages when power is added. Examine the A/C clutch with a flashlight. The electromagnet does not rotate like the clutch does. Cracked or splitting belts can cause further damage to your AC compressor. Checking a Car’s AC Compressor Turn off your vehicle. Ran it this way for a few minutes, but it did not cool. The clutch wire felt broken along its length. Check for 12 volt power at the places noted. Today i’m trying to test the clutch before the compressor gets installed in a couple of weeks. Unplug the single wire connector on the front side of the compressor. The compressor drive hub is usually found at the front of the pulley and is attached directly to the compressor driveshaft. Unplug the wire feed at the AC compressor connection. The black wire on the compressor clutch connector is the power wire. You can diagnose problems with your compressor by using a multimeter, or a device that can measure volts, amps, and ohms. That is why the clutch assembly is necessary. so I looked for fuses and what not but that wasnt the problem. Check the front side of the clutch to examine its condition. Is Spoon Engine A Real Thing? Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. The Best TOAD Vehicles for Frequent Campers. If your air conditioning isn't working properly, you may need to replace the A/C compressor clutch to fix the problem. The A/C compressor is the heart of the system, and without a good compressor, the unit will not function. It is an ominous sign when the clutch engages but the compressor does not spin. Part 1 of 1: Test the clutch. Part 1 of 1: Test the clutch. I’d leave the AC siwtch on all the time. You may just need a clutch coil to repair it. Jump the a/c pressure switch, and it should engage. I was playing with the headlights switch and I started to feel nice cold air then I stop to visually check and sure enough the compressor was working. 2. The compressor clutch consists of a friction plate positioned adjacent to an electromagnetic coil. I would leave it like that till the fall, then add a spacer or something so the clutch isn’t engaged. I think the car stalled because the A/C seized up. Touch the test light to each of the three AC clutch wires. An electromagnetic clutch provides the mechanical link between the pulley and the compressor input shaft whenever air conditioning is demanded. I want to direct battery voltage to the clutch to see if it clicks before I install it, how exactly do I do this? A Open the hood and look at the air conditioning compressor… Low level of refrigerant. Take Advantage Of These Ten Easiest Cars To Work On, Top 6 Causes of Steering Wheel Hard to Turn and Solutions, Symptoms of a Bad Variable Valve Timing Solenoid and How to Replace, 4 Different Types of Burning Smell From Car: Main Causes and Solutions, Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032. Mechanic's Assistant: Okay, I'll connect you to the mechanic to walk you through that for your Chevy. An electromagnetic clutch provides the mechanical link between the pulley and the compressor input shaft whenever air conditioning is demanded. In earlier air conditioning systems, the compressor ran at full capacity whenever its cycling clutch was engaged. I have an open coil. When you turn your air conditioning on, the A/C compressor clutch is the first part to move. Using a DVOM set to the ohms scale, disconnect the electrical connector to the clutch coil. so I looked for fuses and what not but that wasnt the problem. Most importantly, a bad ac compressor can prove to be dangerous. When I got home I was checking things under the hood and the refrigerant pressure was fine (pressure according to chart observed in gauges). Using the 20 volt setting on the DVOM, check for battery voltage at the harness connector. The car ac compressor is majorly the heart of the air conditioning system. Today when I was coming back home from work the AC worked. Test for AC Compressor Clutch Function. If the magnet is defective, replace the compressor. AIR CONDITIONING COMPRESSOR CLUTCH. If the ac clutch is working but the gauges show equal pressure, the compressor … If the AC clutch fails to energize then it would mean that you have a problem with power, ground, thermal protector switch, or the magnetic clutch. Compressor: The air conditioning compressor, driven by a belt or electric motor, circulates refrigerant in the system. Move on to the clutch relay if the fuse turns out fine. If you have any problem with the AC compressor then they will not engage. 6.Refrigerant Leaks. Want to Discharge Car AC at Home? Think of it as a switch that is responsible for engaging and disengaging the AC compressor pulley from its compressor drive. I jumped across the plug and compressor clutch engaged. This is important because the pins on the compressor connector are small, so select connectors that will fit in the compressor plug and not short out by touching each other. So replacing compressor, which any garage I spoke to would do – they don’t want to replace parts on the compressor like coil… not worth their time? Mechanic's Assistant: Okay, I'll connect you to the mechanic to walk you through that for your Chevy. Attach the other end of the jumper wire to the positive terminal of the battery. If your air conditioning isn't working properly, you may need to replace the A/C compressor clutch to fix the problem. Voltage Test: Remove the plug from the clutch coil and activate the A/C system by placing the selector on cold. His work includes instruction manuals, lesson plans, technical brochures and service bulletins for the U.S. military, aerospace industries and research companies. When you turn your air conditioning on, the A/C compressor clutch is the first part to move. b) No current - Open circuit. Repeat this procedure several times, each time listening for the clutch to energize. There are a couple of ways you can fix the problem to bring back the air conditioning system in order. Remove the AC relay and in the relay socket, place a small jumper wire between pins 50 and 52 (check underneath the relay to identify the pins). Look into This! Take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. It is responsible for keeping the refrigerant flowing and thereby ensuring smooth performance. If the bearing or clutch have failed, it is recommended that the compressor … Install jumper connectors onto the compressor electromagnet. Plus, you should also know how to examine the clutch to find out if it is faulty or not. I cut past the break and exposed the wire to do a repeat test. To run this clutch compressor, the engine is connected directly to the pump rotor of the compressor using a belt. Figured the worst that could happen it I could finish off the dying clutch coil. Compare the reading to factory specifications. Touch the other wire to the positive side. The AC clutch is on the front of the compressor where the belt rides. An easy way to check the clutch of your AC compressor is to gently and lightly tap on the clutch when the compressor is running and the motor is on. The middle wire should read "hot." Before starting the next step of diagnosis, you should know that a low-pressure switch can create problems with the compressor clutch’s relay in some car models. You can also check the leads to the compressor which can be the magnetic clutch and also the operation. Step 1: Check the clutch. Check your belts to ensure there is proper tension and the belts are not damaged. What does the second wire do? It consists of guidelines and diagrams for various types of wiring techniques along with other products like lights, home windows, and so on. 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. A careful inspection of the system and its components will help you to pinpoint the source of trouble. SOURCE: 2002 Dodge Durango makes a noise when the ac is It's the clutch or compressor or the idle pulley for the belt for the AC to check it have someone start it with the hood open and use a broom handle pressed to your ear and put the end of the broom near the ac compressor and turn it on and see if you here it there then shut it off and check near the idler pulley to see if it's there. If only the pulley is rotating, the compressor clutch is having an issue, which could be stemming from several sources – a blown fuse, bad clutch oil, low-pressure lockout, or an open wire in the oil. This could also happen if the two, small connectors are touching each other. 8MILELAKE Air Compressor Clutch Rebuild Removal Tool Kit AC Clutch Puller Auto Air Conditioning Remover Installer fit for GM, fit for Ford, fit for Chrysler 4.0 out of 5 stars 42 $20.99 $ 20 . Compressor Clutch. My AC isnt working, the clutch wont engage. When power is applied to the clutch it engages to turn the compressor. Finally, check system performance. The clutch can burn or the bearing can fail. Step 4: Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. Turn the AC settings to the "on" position. Nick, I found the clutch kit on ebay for $82.50 shipped. Check the compressor clutch coil If you have power and ground at the compressor clutch, check the compressor clutch coil for open, resistance, short to ground and short to power. I jumped across the plug and compressor clutch engaged. Checking to see if the compressor clutch is engaging is a simple visual inspection. Your car should be running with the AC on to check the compressor clutch. White Smoke From Exhaust: Main Causes and How to Fix. I ran a #12 wire to the battery, I figured I was pretty safe with a 10 amp fuse. Check your belts to ensure there is proper tension and the belts are not damaged. With the vehicle running, step on the clutch pedal and put the vehicle into gear. 10 Best Tire Companies In The World [Updated In 2021]. Connect a test lamp between the ignition circuit terminal 85 and the control circuit terminal 86. The Compressor is not meant to run all the time. (3) bad A/C compressor relay (which you have already checked it seems). The compressor is engaged by the compressor clutch, made up of a powerful electromagnet and a drive plate. I have placed a question mark by the ground lead in the diagram. 99 What is the most common reason for an air conditioning compressor not to engage? So it’s worth maybe $2.5K? OK, with a/c on and engine running there is power to the switch on the accumulator. Turn the engine on. Is there an easy way to tell whether the A/C clutch failed, or the compressor? A bad AC compressor clutch needs immediate fixing. Touch the test light to the wires on the clutch relay. The freon has to flow thru the system to work, and the cooling fan draws air thru the condenser to get rid of the heat from inside the car. The pulley moves freely, because the clutch is disengaged with the engine off. 000569, Member of Tokyo Chamber of Commerce Boueki - 201650, How To Manually Engage AC Compressor Clutch: The Easiest Methods, 11 Signs Your Car Is NOT Shifting Correctly, 9 Ways You Are Unconsciously Wasting Money on Car, 6 Commons Symptoms of Bad Spark Plug Wires, Reason for Car Making Humming Noise When Accelerating, Things To Avoid While Driving An Automatic, Best Tire Pressure Monitoring System Reviews. Tips – When you are going to manually engage the compressor, make sure that the system has enough oil. Go on to check the fuse if you cannot read the voltage readings. To check for coil resistance, set your meter to the ohms scale and connect both leads to the clutch coil terminals. Step 4: Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. How Long Do CVT Transmissions Last? Step 1: Check the clutch. Cracked or splitting belts can cause further damage to your AC compressor. The Easy Way to Use a Recharge Kit for Car AC. Connect one of the wires, it doesn't matter which one, to the negative side of the battery. Easy. What’s your thoughts on grinding down the clutch plate so it’s always engaged to the pulley / always turns the compressor? And the faster the engine turned, the more pressure the compressor developed. Route the wires directly to the vehicle battery. Remove the relay from the socket. An automobile can have numerous serious problems and a dysfunctional AC compressor clutch is one of them. In almost every instance when the clutch fails, it becomes burnt and discolored. If this happens, quickly remove the wire and replace the compressor. The Answer. If the magnet is good, the compressor clutch will click into place when the magnet powers up. Use a digital voltmeter to measure the ground and voltage of the battery at the detached connector cable. Knowing when your AC compressor is running or not is critical to diagnosing the AC system, but also for charging the system. In a few cases, the clutch does not engage due to a clogged refrigerant circuit. I dont have guages to check pressure so I googled and found an article about a Ram with similar problem. You will need to find the signal wire connector that attaches to the compressor clutch. Afraid if there’s other issues, I’ll blame them…, So I could do the clutch removal, grinding and replace. The car is a 2010 honda civic with 150K miles and has banged up bumper. Now, listen for the clutch and the compressor and check if they engage. Driving a Toyota Land Cruiser: Why Is It Appealing? Finally, check system performance. Hathcoat is an accredited technical instructor through Kent State University and certified in automotive service excellence. (5) the ECU can tell the compressor clutch to disengage. Tips – You should route the jumper wire to avoid it getting tangled or interfering with other moving components. If you want to do a quick test with the compressor out of the car already, you can jump the power on the compressor with 12v and a ground. In this step, you have to detach the connector cable from clutch oil. The next section tells you how to manually engage AC compressor clutch at home. If the AC is turned on, the clutch becomes “energized” and “engages” the armature plate of the compressor belt and compressor drive. … The other cause of AC compressor failure is refrigerant leaks. A delay can cause serious damage to the air conditioning system and the engine. Proudly installing things where they're not … Check the resistance of the field coil for the compressor clutch (there is a harness with 1 pin that comes off the compressor and heads up the radiator fan assembly - check the resistance between that pin and the housing of the compressor - it should be around 4 ohms or so - if it's a lot higher, the field coil/solenoid needs to be replaced. Sometimes, when the clutch is worn, the disc is too thin and may not engage properly. You can also check the high and low-pressure switch of it. Jack Hathcoat has been a technical writer since 1974. Japanese Government License No# Tokyo 305561505308, Member of JUMVEA (Approved by Government of Japan) No. The AC compressor will not have power and the AC system will not function. If the A/C clutch does not activate, test the control circuit for an open/high resistance. Turns out there are 2 switches in the … Knowing when your AC compressor is running or not is critical to diagnosing the AC system, but also for charging the system. How-To Test For Ac Compressor Clutch Function – Youtube – Kenworth W900 Wiring Diagram Wiring Diagram includes several comprehensive illustrations that display the connection of various things. Touch the probes to the clutch coil terminals. This is most of the time located on the side or top of the compressor and is typically 2, sometimes 3, wire harness. Knowing how to manually engage AC compressor clutch will help you skip a visit to the mechanic. Test compressor clutch coil. (4) bad compressor clutch. July 5, 2016, 11:25pm #2. With a engine off: If you want to purchase a power probe for the clutch you can do that or try to use a wire such as in the video above. 3 Air Gap With the vehicle running, step on the clutch pedal and put the vehicle into gear. Start the engine and let it warm up. I have just refilled my C202 AC……….now my fan turns on and off with some noise whenever i turn on the AC,what could be the problem. I had no other choice, I had to narrow down my problems from TIPM, low freon, bad clutch, or bad compressor. The flexible, rubber isolators that allow the clutch disc to move in and out will melt from the intense heat, and the metal plates will appear rusty. If your car is compatible with R134a type of refrigerant, attaching a can to the system will override the low-pressure switch and restore the normal function of the compressor clutch. Open the hood and look at the serpentine belt to locate the AC compressor. Just adding refrigerant will solve this problem. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, "Truck and Van Repair Manual", Chiltons: 1993. Be certain and use the right sized connectors to conduct this test. AIR CONDITIONING COMPRESSOR CLUTCH. Turns out there are 2 switches in the … how to manually engage ac compressor clutch. The transmission should … If you tap any part of your A/C compresser weather its the casing or even the clutch pully, that does damage to the yoke inside the compressor, I dont mean to be a dick or aything but just being a mechanic doesnt mean anything, I do A/C work, Im 608 & 609 cert. Because of the way an AC system works, the engagement of the compressor is cycled based on … What Is Shift Lock Release And How To Use It? Check the owner’s manual to check the correct instructions for checking up the compressor oil and level and filling it up. The clutch wire felt broken along its length. All three wires should read inactive. In a few car models, the power of the air conditioning system flows from the AC switch to the fuse before being transmitted to the clutch oil through the low-pressure evaporator temperature. So, in case there is any problem with the compressor, the entire air conditioning system will also be affected. Before I do, is there anything else you want him to know? Before checking to see if a clutch needs to be replaced, see if it is engaging and disengaging properly. Start by turning the engine on. I dont have guages to check pressure so I googled and found an article about a Ram with similar problem. The clutch is driven by a drive/serpentine belt, which engages the compressor when you switch on the AC. Facts and Fallacies! Compressor Clutch. Your email address will not be published. For an AC compressor to work, it needs a clutch, bearing, and an electrical connector. If a short or open is found in the field coil, it must be replaced. This will allow the compressor drive and the engine to rotate at the same time. or $3K at most? If they are bad, they should be replaced with a new compressor. I think the car stalled because the A/C seized up. Is there an easy way to tell whether the A/C clutch failed, or the compressor? Sadly at over 400 mega ohms the clutch coil has failed. There is no need to switch on the air conditioning system for this method to work. Although I do not recommend doing this unless you HAVE too, you could damage the compressor … The computer can turn it on when needed, then off when it has done its job. Nope just how to check the clutch electrically Is the clutch facing burned up with a wide air gap?