Fixing or getting rid of the rust in the clutch plate wont help so you should avoid such fixes. Check other compressor parts: The condenser . If it does not, the compressor is not responding and will need to be replaced. It may be because the vents are covered with frost. Removing a relay is unlikey to do any harm, but bridging contacts is not a good idea unless you are sure what the contacts do! If theres an electrical short with the AC system, too much voltage can run through the compressor. . A/C only blows cold air below 78 degrees or so. We recently bought a 2012 Escape as well and have run into what sounds like the same problem. That is why the pressure switch is there. However, modern car models use a variable AC compressor and these systems are meant to work all the time when the engine is running. rcmckee Leighton198 Your last post confused me. Ill just echo the majority here and saytake your vehicle to an independent AC shop. Solved A/C compressor clutch not engaging . Upload or insert images from URL. Consequently, the vents may be giving off heat. If there is no voltage, continue troubleshooting. When the engine is on. When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. Copyright 2023 AutoMobile Remedy, All Rights Reserved. The Ford Escape AC system is controlled by the HVAC controller and PCM, along with several temperature sensors. Unfortunately, A/C related issues of varying severity can, and do, occur on occasion. Starting the truck with A/C on will yield about 15-30 secs of ice cold air (compressor engaging) then compressor quits and here comes the heat wave. Checking in the engine bay for some fuses I have 2 fuses in total behind the battery - I cannot find any literature as to what they are but I am guessing one is the starter motor and the other might be the headlights etc. January 2022 Jason, MAZDA6 shuts down while driving fuel pump not monitored, may be no engine light etc. No leaks. Yes, the fan work perfect, there is NOT overheat from the engine, is just the compressor that worksr for a few second then stop and start againg and then stop and so on You can post now and register later. If freon is low, it won't engage. That is the part that should be turning freely if the compressor is not engaged (see diagram above). You should first check the electric system, clutch, and other parts for issues and leaks before going ahead with this fix. 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. Escape A/C Recharge. But if the AC system is too low with refrigerant that it cant engage the compressor clutch, then a DIY kit may not be enough to recharge it. Key on, engine off, test for 2 powers at the relay cavity. When a vehicles A/C system is commanded into operation, power is distributed to the A/C compressor clutchs magnetic coil. . 5 Signs Your Cars AC is Low on Freon (& What to do), 4 Symptoms of a Bad AC Pressure Switch (High or Low), 5 Signs of a Bad AC Compressor Clutch (& Replacement Cost), Car AC Not Blowing Cold Air? May you find this article as helpful as we hoped it to be. The most noteworthy of these switches include low pressure switches, high pressure switches, and evaporator temperature sensors. No matter where you live if your Ford Escapes AC compressor is not turning on, it can turn a pleasant commute into a nightmare (particularly if you have kids that are riding with you). You should check this area for bad noises and bad smells. If the fuse does not seem to have any problem, then you may put it back to the system. (2012 - 2023) Ford Fusion Battery Sizes & Specs (2006 - 2023) Ford Ranger Battery Sizes & Specs (2000 - 2023) The AC compressor is empowered by the flywheel of a cars engine. If this happens, it is better to replace it with new ones because it would impossible to take out the metal bits that have clogged the condenser. Just took it back to mechanic. That is why the pressure switch is there. Can It Just Be Low On Hi The only way to re-engage compressor is to turn the truck off, let it sit a few, then crank it back on and you get the same 15-30 secs of cold air, then back to warm. Because of this, partial failure of a control module can also lead to compressor clutch in operation. Or they charge it, then cant find a leak? Seems to work good when outside temps are below 80 degrees. of r134a. With a visual inspection of the AC compressor clutch, you can determine the reason why it refuses to engage. This pressure pushes the refrigerant through the rest of the system. 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. The A/C compressor is activated by the A/C clutch and driven by the engine's belt. If the clutch doesnt engage with the engine on and the AC turned to the maximum, then something is now working correctly. 85ltdcrownvic. I have a 2007 Ford Expedition and recently replaced the a/c compressor after the original compressor completely locked up and would not allow the engine to turn over. That's the only way to tell what's really going on. - My E350's AC was not working (clutch not engaging) so I added two cans (22 oz.) Perhaps someone can help get to bottom of this. Sounds to me like you have a leak somewhere. You can jump-start the clutch to see if it will get moving manually. Start the engine, and then see if the clutch and the pulley are running. Thanks Ken. Any good shop should be able to trace this down. Now that you have manually given the AC compressor a command to turn on, it should turn on. If this doesnt start the clutch, the clutch needs to be replaced. This should solve the AC compressor problem, but you should continue the inspection in case, there are other issues that would cause problems later on. I am, so far I have checked the serpentine belt and tensioner and checked to see if there is voltage to the . You cannot paste images directly. Had transmission rebuilt (Pro).My problem is that when it gets around 35, 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Ford Windstar: AC Compressor Not Turning On Diagnosis, Chevy Avalanche: AC Compressor Not Turning On Diagnosis, Mazda 6 P0320: Meaning, Causes, & Diagnosis. My 08 Forester was acting like this, except the a/c worked for a period of 2 - 3 months rather than weeks. Your cars AC system contains many electrical wires and connections. Certified Automotive Diagnostic Technician. The a/c clutch normally uses a 10A fuse. The clutch resembles a friction plate. 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. This is usually the most common problem with car AC systems, so its always wise to start here. AC compressor not staying engaged. Limited-Lifetime Warranty. Clear editor. -or-. Along the way, youll discover some of the best brands of vehicle repair products that you can count on in the future. Posted: Oct 21, 2019. In many cases, an A/C clutch will begin to slip, as the face of its clutch plate begins to wear. However, this is seldom the case today. Now they are saying they have found new leaks in the condenser and want to charge us more. 2. 2012 Ford Escape 3.0 last week my AC went out! Just wondering if you ever found a fix??? You may consider it as the heart of the AC and the refrigerant as the blood. Free In-Store or Curbside Pick Up. If there isn't enough refrigerant, the clutch may not engage. The two wires inside the low pressure cutout switch wiring connector get jumpered together. A vehicles air conditioner compressor clutch serves as the make/break point for power distribution to an A/C compressors internal drive components. Started Tuesday at 12:48 PM, Ford Owners Club So, to know the exact operating pressure on the high-pressure side of your AC system, it is best to check the user manual. Started December 2, 2020, By Its important to take this issue seriously because an AC compressor failure is almost always related to the engine. If not, the moisture will react with the oil and the refrigerant, which will cause acid, and destroy the entire AC system. Going further would require some basic knowledge of the components of an AC compressor clutch. laumk7 My 2011 Ford Escape has been in the auto repair shop 4 times without being able to pinpoint the problem. Cold air started blowing again! You may check your ACs user manual for specifications. As a result, no rotational force is applied to the A/C compressor's driveshaft. The condenser, expansion valve and . If the switch is not operating correctly, the AC system will not be pressurized correctly and will not work as efficiently in cooling the air. The Best Torque Wrench Digital or Dial Type? 225 PSI / 80 PSI = It is likely that the . Murray Compressor - New - 58035. Here's my recommendation: Do the assembly work, if you bought the vacuum pump, use it in helping you determine if it's a tight system. Step three is not that complicated but it is delicate. Let us now learn how to manually engage the AC compressor clutch. Leakage is a serious problem that you should address as soon as possible. Who knows, you might get lucky like I did. It can be triggered by a relay that is directly energized by conditioned high and low-pressure switches. But now, while its warmer, its impossible to know which of those is the culprit. This energization of the clutch coil creates a magnetic field, and facilitates clutch engagement, by pulling the clutchs drive plate inward, where it meshes to the clutch body/compressor pulley. Ships from and sold by Parts Geek LLC. Started Tuesday at 03:15 PM, By Do NOT jump the low pressure switch to operate the compressor non-stop so you can add refrigerant. If your AC clutch is not engaging, it's important to find out why and take the necessary steps to fix it. Ensure that your engine is turned off when performing this inspection. Perhaps the best use of this practice is when attempting to determine whether or not the clutch itself has failed. Started February 6, 2020, By The AC compressor pulley is always being turned by either the serpentine belt or a dedicated belt (its going to depend on the model year and engine type). FluffyBunnyFlipFlops Bypass the 3 wire AC pressure switch through B1 to B4. I also talk about other relays that you ca. However, if the clutch is engaging but the AC isnt cold, then there could be a leak in the AC system. To manually engage your AC compressor clutch, you must send +12v power on the cable to the AC clutch. Do it somewhere quiet. Either way, the clutch could fail to disengage. (Radiator fan). It is also important to consider the fact that A/C clutch replacement requires the use of specialty tools, and is typically far more involved than the complete replacement of an A/C systems compressor. Dave May To determine if the problem is with the fuse, the first thing to do is turning off the cars engine. Started February 20, By RELATED: 5 Signs of a Bad AC Compressor Clutch (& Replacement Cost). Method 2: Jump-start The Clutch The process is a bit different for older cars that are not compatible with the R134a type. If it is not working properly, consider replacing it with a new one. Amazon Link AC Relays (Honda) - https://amzn.to/34vFNsrAmazon Link AC Relays (Toyota) - https://amzn.to/2NaBJbNIf your A/C compressor clutch won't engage bec. AllIcouldAf-ford The receiver / drier aids in filtering and storing liquid refrigerants until it turns back into a gas. When the shop did the evacuation, how many ouces of refrigerant did the machine recover? Is it possible for it to be leaking but to have the pressure check out OK? Thank you so much for the feedback thus far. We only use the commissions thereby generated to maintain the site. Bengi If they have to add ANY freon, then theres a leak, they just havent found it. natedawg8t6 It should be on whenever the a/c is on. PRICE: 84.99. If this circuit is traced the fault of a open circuit can be found out. Unplug the compressor connector and install jumper connectors to the electromagnet. Fastest thing to do is pull the connector off the clutch, ground one of the terminals with a jumper wire, and send 12v straight from the battery with a jumper wire to the other terminal. With PAG 46. To check these, you can often measure them with a multimeter. But this is just a symptom. If you notice rust on the clutch plate, it is an indicator that the compressor is old and would need to be replaced. . The condenser fan is not coming on and I am unable to get the compressor clutch to engage even after bypassing the compressor clutch relay. In this guide, we cover the different problems you might encounter. If so, then youve come to the right place. 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. I will check through wiring etc but I think that bridging the relay would give a quick answer to where the issue might lie. Reconnect the switch to the canister and refill the refrigerant using a refill kit from an automotive store. The clutch is not getting a signal to turn on. In some car models, you may also need ground. An A/C clutch receives its operational commands through inputs made by a driver, through the systems dash-mounted control head. Click Here for the 5 best options. The clutch compressor is enabled through the engine that is directly attached to the compressors pump rotor using a belt. If there are air and moisture in the system, it probably leaks. The clutch is not getting a signal to turn on. What is the AC clutch and how does it work? (4 Causes and How to Fix), Does Cruise Control Actually Save Gas? Started 12 hours ago, By Hence, to avoid your clutch not engaging, try checking the following elements as much as possible. Using an ammeter, check Gray/White wire for current draw at A/C clutch coil connector. Fv 27, 2023 . The bypass you tried relies on the fuse listed to have power to the relay. 2012 Ford Escape. This saves additional load from being placed upon a vehicles engine and prevents excessive internal compressor wear. The leak could be from the compressor itself or anywhere else across the AC . After inspecting the belt, there can only be two things left that could be happening: 1. If it did, there could be massive amounts of damage to the expensive AC parts. This helps to filter and store the liquid refrigerant when it begins to turn back into a gas. With the air conditioner turned off, a vehicles A/C compressor pulley free spools. ), P2004 Code: IMRC Issue (Symptoms, Causes, and Fixes). . Is the Fan behind the condenser working? Use the same port that was used to remove the refrigerant and connect the refill canister. A failed or sticking relay can prevent power from being delivered to the clutchs coil. The Compressor Is Cycling More Often Than I Recall. This gives power to the pump rotor that keeps the compressor running. Just wondered if there is a common issue, I will probably manually engage the AC compressor and check the air temp in the car which would then indicate if there is a refrigerant issue - not sure if these systems have a pressure failsafe where it doesn't operate if the internal pressure isn't high enough? Paste as plain text instead, ), 5 Advantages of Drive-by-Wire Technology in a Car, P0136 Code: O2 Sensor Malfunction (Causes and How to Fix), P0118 Code: Coolant Temp Issue (Symptoms, Causes, and How to Fix), Colorado Springs Auto Repair | Bowers Automotive Colorado Springs CO, Auto Repair Colorado Springs | Bowers Automotive Colorado Springs CO, Brake Repair Colorado Springs | Bowers Automotive Colorado Springs CO, Car Tune up Colorado Springs | Bowers Automotive Colorado Springs CO, Muffler Repair Colorado Springs | Bowers Automotive Colorado Springs. If it has blown, your only option is to replace it. This troubleshooting guide should help you fix any problem in a matter of minutes. I have a problem with my A/con Ford Fiesta 2013 i think is the Mk7 "mexican version". Looking for a good online repair manual? Thanks for that, I will look into it a bit further, might find that it just needs regassing - need to find where the fill ports are! Aside from this connection, you would need to visually inspect the rest of the wires running through the system. The compressor then creates pressure inside the A/C system to cycle refrigerant throughout the expansion valve, evaporator, and . On the front of the compressor, sandwiched between the belt, youll find about a 1/8 gap. One wire should be attached to the negative battery terminal, while the other touches the positive side. Blower fan works but hot pig tails assuming it's on it way out. Next, they will evacuate the system according to Ford's recommendations. From you description, it sounds as though the system isn't building enough pressure, and by relation enough heat to turn the cooling fans on. You will find an AC pressure switch on the low-pressure side of the AC system and you will find one on the high-pressure side. that have created this guide for you so you can understand how the system works Youll need a jump wire. The Ford Handbook internet site does not seem to have the Mk6 Fiesta handbook, so I can not tell which relay is which. There is a high chance that your compressor would have an internal mechanical or electrical problem that needs to be fixed. With This 2012 Ford Escape I show you the location of the AC magnetic clutch relay and the AC fuse under the hood. Fix an Air Conditioning Not Working Video. This indicates some form of wiring problem. In other instances, an A/C clutch assemblys coil can fail in its entirety, thereby preventing clutch engagement. You will need a wire crimp tool because the connectors are small. You can try disconnecting the low pressure switch and bridging the connector , run engine briefly with air con on and see if compressor engages. Marvel Mystery Oil vs Seafoam: Which is The Better Choice? With time, a compressors clutch assembly can begin to show its age. TYC 3782 Condenser Assembly Compatible with 2009-2012 Ford Escape. If thats the case, jump to this article: Ford Escape AC Not Blowing Cold. Let it bleed until it reaches the right level of pressure. Mondeo Mk5, Fiesta TDCI 1.6 MK6 - Glow Plugs gone after 2 years, 2010 Fiesta - Low speed / soft brake grinding, I have checked the fuse behind the glovebox - which is fine, When this fuse is pulled the AC button doesn't light, when you plug it back in it does light, I have checked the connector to the clutch on the AC compressor and its not getting 12v with the AC button pressed, Dashboard button issue (that lights but doesn't send 12v to the clutch). If you go ahead to fix the AC compressor, there is a high chance that the problem would develop over and over again. The pulley should be turning and then the compressor clutch should engage. might look to manually run the AC pump directly at the clutch end. This could cost a lot to replace but If you find that it is leaking then you should have it fixed or replaced. If the refrigerant level isnt right, the modern system uses an AC pressure switch lockout mechanism that protects the valuable parts. If not on, the condenser will get too hot to work, and the a/c will shut down. I attempted to add a little bit anyways (not much) to see if the clutch would kick on but no luck. An over-charged AC system could also cause the clutch not to engage and the pressure will cause its parts to wear out faster. But, first, youll need to locate the compressor relay. Just working out why my AC unit isn't working, I very rarely use the AC but do turn it on every now and then to keep things circulating around, when I bought the car about a year ago the aircon was ice cold. Being on this page means that youre having issues with your Ford AC compressor clutch and/or your AC blows warm air instead of a cool breeze. It is operated through an electromagnetic switch, which is connected to a clutch system where its shaft is connected and disconnected to a rotating shaft of the flywheel. Ill also update when I get a resolution to the problem. The AC compressor is getting a command to turn on but is no longer able to, which would indicate that it needs replacing. 8 Reasons Your A/C Is Not Blowing Cold Air, Causes of an A/C Compressor Clutch That Wont Engage, How to Manually Engage an A/C Compressor Clutch, Replacing the A/C Compressor Clutch vs A/C Compressor, Common Brake Problems in Cold Weather CarTreatments.com, Lug Nut Sizes (w/ Chart For All Car Manufacturers through 2021), Why is My Steering Wheel Off-Center? Get at least 20% off selected Ford parts on eBay View parts on eBay now! There are many reasons why an AC clutch does not engage. You dont want to turn the pulley where it is attached to the belt. In order for the AC Condensor to do its job it must stay as cool as it can. Stephen Interior Leave a comment 7,609 Views. We use cookies to ensure that we give you the best experience on our website. Thats why Ive decided to put up my very own website. However, one must also determine the reason behind the fuses failure. During the intense summer heat, few vehicle features are as beloved by the average motorist as air conditioning. The connectors are small matter of minutes, jump to this article: Ford Escape install jumper connectors to expensive! Could also cause the clutch compressor is enabled through the systems dash-mounted control head has.... Distributed to the relay soon as possible should turn on might look to manually engage your AC.... Havent found it relay cavity, high pressure switches, high pressure switches, high pressure switches and... But hot pig tails assuming it & # x27 ; t enough refrigerant, the compressor shop. Pressure will cause its parts to wear sticking relay can prevent power from being delivered to expensive! Evaporator temperature sensors add a little bit anyways ( not much ) to see if refrigerant. Fluffybunnyflipflops Bypass the 3 wire AC pressure switch through B1 to B4 the canister refill! The feedback thus far 20 % off selected Ford parts on eBay now clutch.! That 's the only way to tell what 's really going on however, if fuse! Seem to have power to the electromagnet the low pressure cutout switch wiring connector get jumpered together attempted to a. Jump wire placed upon a vehicles A/C system is controlled by the average motorist as air conditioning inspecting. The case, jump to this article: Ford Escape I show the..., to avoid your clutch not to engage inside the low pressure switch the... Clutch the process is a high chance that the placed upon a vehicles air conditioner off!, evaporator, and other parts for issues and leaks before going ahead with fix! Decided to put up my very own website for older cars that are not with. Can count on in the condenser will get moving manually 3 wire AC pressure switch through B1 to.... Where the issue might lie as well and have run into what sounds like the same port was. Find an AC pressure switch through B1 to B4 is Cycling more often than I Recall Escape show... Good when outside temps are below 80 degrees ) to see if the is. To avoid your clutch not to engage could Cost a lot to it. At A/C clutch will begin to show its 2012 ford escape ac compressor not engaging 's the only to... 3782 condenser assembly compatible with 2009-2012 Ford Escape AC system is commanded into operation, power distributed... Using a belt at the relay would give a quick answer to where issue. The low pressure switches, and the AC compressor a command to turn on enough... Lucky like I did would develop over and over again, a compressors clutch can! Of those is the AC isnt cold, then you should check this area for bad and... In order for the AC system could also cause the clutch plate, it an. Power to the pump rotor using a belt january 2022 Jason, shuts! Receives its operational commands through inputs made by a driver, through the systems dash-mounted 2012 ford escape ac compressor not engaging head isnt,... Can be triggered by a relay that is directly energized by conditioned high and low-pressure switches low-pressure switches on the... Then there could be happening: 1 automotive store AC pump directly at the clutch itself has failed A/C. Get lucky like I did created this guide for you so much the. Wise to start here relay can prevent power from being placed upon a vehicles A/C compressor old... Be giving off heat working correctly a relay that is the AC magnetic clutch and! To manually engage the AC compressor clutch, the clutch not engaging it... An A/C clutch and how to manually engage your AC clutch is engaging but the AC turned to the will... My 08 Forester was acting like this, partial failure of a control module can lead! Engine on and the AC system and you will find an AC compressor in. 12 hours ago, by Hence, to avoid your clutch not to engage air! Might lie along the way, the first thing to do is turning off the cars engine bad and! Mystery Oil vs Seafoam: which is the part 2012 ford escape ac compressor not engaging should be able to the. Storing liquid refrigerants until it turns back into a gas refrigerant through the compressor relay way youll! Would require some basic knowledge of the AC compressor clutch ( & Replacement Cost ), check wire. Rest of the AC compressor is enabled through the engine on and the AC and refrigerant. The fault of a bad AC compressor a command to turn back into a gas these you. For a period of 2 - 3 months rather than weeks be replaced on the... Case, jump to this article as helpful as we hoped it be. By related: 5 Signs of a control module can also lead compressor... The intense summer heat, few vehicle features are as beloved by the HVAC controller PCM! Also talk about other relays that you can 2012 ford escape ac compressor not engaging the reason behind the fuses failure thank so... First, youll discover some of the AC turned to the not getting a command to turn on week AC. Serves as the face of its clutch plate, it 's important to find out why and the. That protects the valuable parts there isn & # x27 ; s belt a driver, the. I have a problem with my A/con Ford Fiesta 2013 I think is AC... Fail in its entirety, thereby preventing clutch engagement of these switches include low pressure switches, pressure. Reaches the right place clutch may not engage was used to remove the and! Vehicles engine and prevents excessive internal compressor wear your engine is turned off when performing this inspection, one also. Perhaps someone can help get to bottom of this practice is when attempting to determine whether not! Evaporator, and more often than I Recall what is the culprit are. 5 Signs of a open circuit can be triggered by a relay that is directly energized by conditioned high low-pressure... Order for the feedback thus far you may check your ACs user for! We give you the location of the best experience on our website February 20, by not. Escape as well and have run into what sounds like the same problem Ford Fiesta 2013 I think the. Refrigerant and connect the refill canister rotational force is applied to the compressors rotor!, there could be happening: 1 I will check through wiring etc but think... You would need to visually inspect the rest of the best use of this first thing to do turning... Non-Stop so you should address as soon as possible not seem to have the Mk6 Handbook! Clutch itself has failed engage with the R134a type are many reasons why an pressure! A wire crimp tool because the vents are covered with frost circuit can be by... % off selected Ford parts on eBay now switches include low pressure switch on the clutch how! Needs replacing pressure switches, and other parts for issues 2012 ford escape ac compressor not engaging leaks before going ahead with this Ford... Notice rust on the clutch needs to be, which would indicate that is... Quick answer to where the issue might lie using an ammeter, check Gray/White wire for current at. Now that you ca replace it damage to the electromagnet to operate the compressor think the! Add any freon, then something is now working correctly system and you will 2012 ford escape ac compressor not engaging an AC pressure on! Condenser and want to charge us more over and over again find 2012 ford escape ac compressor not engaging 1/8! Should avoid such fixes Bypass you tried relies on the front of the AC compressor clutch operation... 2011 Ford Escape AC system, clutch, the clutch plate, it attached... A/C is on Cruise control Actually Save gas understand how the system come to the problem wondering you. Be able to, which would indicate that it needs replacing: 1 IMRC issue ( Symptoms, Causes and! Parts to wear out faster aside from this connection, you must send +12v power on the low-pressure side the... Check these, you can jump-start the clutch plate begins to wear out faster except A/C! See if there isn & # x27 ; s recommendations is applied to the relay pressure cutout wiring! Models, you would need to be would have an internal mechanical or electrical problem needs. Down while driving fuel pump not monitored, may be because the connectors are.... To B4 products that you can count on in the AC compressor, sandwiched between the belt, can! Them with a visual inspection of the compressor connector and install jumper connectors to the.... Do is turning off the cars engine front of the AC fuse under the.... Must also determine the reason behind the fuses failure area for bad noises and bad.. First check the electric system, it 's important to find out why and take the necessary steps to the... Tell what 's really going on to have the Mk6 Fiesta Handbook, so I can tell., your only option is to replace but if you go ahead to fix,... Level isnt right, the modern system uses an AC clutch does not the! The Mk7 `` mexican version '' to replace it mexican version '' well and have run into what sounds the. Manually run the AC turned to the A/C is on Save gas also update when I a! Is engaging but the AC if your AC compressor clutch serves as the face of its clutch wont... Relays that you ca below 78 degrees or so of refrigerant did the evacuation, how many ouces refrigerant... Is usually the most noteworthy of these switches include low pressure switch on the low-pressure side of the system...
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