The other day I purchased an AC manifold gauge set. Added the second can watching the pressure on the low side drop from can pressure down to 5 or 6 lbs of system pressure as the second can approached empty. But, for a closer inspection and a more accurate diagnosis, it’s still best to take your car to the local mechanic. Based on the pressures you gave it looks like your high side pressure is a little low and your low side pressure is a little high. Does the wheel arch liner have to be removed? If you are low on refrigerant, it leaked out somewhere. Thanks for any advice. During operation refrigerant is returning to the compressor from the cooling (evaporator) coil in this line. The low-pressure side, when connected to the gauge, should read less than 100 psi. Roughly half way through the third can I decided something was a miss. The correct reading will display once the clutch engages and the gauge stops cycling. Required fields are marked *. This allows the unit to pull heat from inside air, release it outdoors, and cycle the cooled air throughout the house. Low-pressure systems form under areas of wind divergence that occur in the upper levels of the atmosphere.The formation process of a low-pressure area is known as cyclogenesis.Within the field of meteorology, atmospheric divergence aloft occurs in two areas. It’s the height of the summer season and you’re all prepped up for a long drive across the country for that much needed summer vacation. When testing your car’s AC system pressure, make sure to proceed carefully, follow instructions properly, and use your car manual as a guide on what you should expect the readings to be for your vehicle. REGULATOR 530 AC PRESSURE 0-1.5 BAR Product Code Product group: 611 Product number: 5100301. PSI is the common measurement for pressure used in terms of pounds per square inch. The good thing is, there’s a way to find out the problem and diagnose whether your AC system is still healthy. AC Low Side High, High Side Low: Why Does This Happen? Nonetheless, to avoid overcharging your system, make sure to first check whether there are any leaks along the lines, hoses, and the compressor. Here’s a simple guide that you can use to compare your readings with: When the engine is off, the readings shouldn’t be close to 0 or over 150 psi. Recharging AC system the low side pressure is dropping to 0 psi with only one 12 oz. When checking low-side pressure you will get two different pressure readings, one when the compressor cycles on and one when the compressor cycles off. In other words, the compressor is sucking, but there’s nothing to suck. Cauliflower Fried Rice is an easy low-carb side or main if you add chicken, shrimp, or even leftover ham!2 Smart Points 108 Calories I have a 2011 Escape with a 3.0 that the ac compressor will not engage. The side of the AC that leads from the compressor to the receiver dryer is the high-pressure side, so the piping leading from the compressor to the opposite side will be on the low-pressure side. Your AC is not working properly. References. I ran the vacuum on it for an hour and it was holding a vacuum. Shut it off, and low side very slowly returned to 100, after 30 minutes or so. Join Date: … I check the gauges and Low side is 80 PSI and High side is 100 PSI. Now, when the engine is on and running, and the pressure gauge still reads a high pressure on the high side while the low side pressure keeps dropping, it should be clear that the underlying issue has to do with the condenser. I'm not sure if your Lancer is equipped with a high-side pressure switch but the same principle applies. In most cases, their diagrams are right from the factory manuals. Sounds like you aint got a clue. 0 0 0 0. My high side was perfect but my low side was hovering around 15-20 psi. What could possibly be making the high side such a low psi? Search Auto AC Forum Archives. Compressor turns off then slowly goes back to about 30 psi. First of all, why are AC readings important, and what does it tell you? ice-n-tropics on Wed September 28, 2005 3:09 PM . Anyway, I hooked up my manifold gauges and the low side pressure maxed out the gauge! So ive done a regular ac recharge using a kit from autozone on my other cars but of course a bmw doesnt come without 200 more problems. When checking low-side pressure you will get two different pressure readings, one when the compressor cycles on and one when the compressor cycles off. High side and low side refer to the pressure in the ac system. What does high-side and low-side mean with respect to car AC's? Today, seeing that the AC came out hot, I expected to find the low side to read 0 psi thinking it was a leak. Page 1 of 2 1 2 Next > Aug 3, 2013 #1. cainekh Bobtail Member. So I started adding a can r134a and after most of the can was in the pressure on the low side started going up at a much faster rate then the high side. The secudairy regulator will regulate the acetylene pressure from the distribution piping to the twin-hose. I have talked a bit on what the correct AC pressure readings should be, and what are the common issues that you might be encountering if the readings are wrong. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. Hey everyone! The refrigerant gas used in the AC lines must be maintained at precise levels so the system pumps at the right pressure. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? Both fans are running, High pressure side shows 75psi and the low side shows 65psi. Also a brand new trinary switch. However, if there’s a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, there’s nothing to suck. sounds like you need to call a pro. I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. certified. What causes high SH, low on charge or a restriction. Adjust your Low Pressure control to stop before it hit 0 psi. So today I am trying to fix it. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Initialize Ford auto up/down one-touch feature, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Static pressure was the same when I started, around 120ish if I remember right. Gauge reads 0 pressure? Eventually, it should stay engaged all the time. The Best Torque Wrench Digital or Dial Type? Today I hooked it up for pressure readings. Pressure Range Low side: 0 to -29.99 psi High side: 71 to 85 psi Indications Low pressure side becomes a vacuum High pressure as listed above Frost or condensation on the front and rear pipe connections of the receiver dryer or expansion valve Causes AC system is blocked by contamination or ice You may notice the compressor clutch engage and disengage as more refrigerant is added. The Fairchild Model 11 pneumatic low pressure regulator features control sensitivity of less than 0.05" water column and high flow capacity to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions. An automotive air conditioner has a high and low side, divided by a metering device and the A/C compressor. I am trying to diagnose an AC problem and have a basic question. Roughly half way through the third can I decided something was a miss. The high side pressure does go up to about 10 lbs when I shut the system off. A low-pressure area, low area or low is a region where the air pressure is lower than that of surrounding locations. This means that the condenser fan cannot efficiently and quickly cool the AC system. My high side pressure is reading perfect at 225. You Fix Cars: Automobile Air Conditioning ; Writer Bio. I hook up the map gauges and do a diagnostic test. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. Position 14 in the drawing. No matter what you do, your car still feels like an oven. If everything is working properly you would have 8°-12° SC and 10°-20° SH. Here’s a simple guide that you can use to compare your readings with: When the engine is off. Low-side air conditioner compressor motor pressure: this is the pressure in the air conditioner's refrigerant suction line (low side pressure during compressor operation) and this will be a relatively low number, often less than 100 psi. why? These include using an inappropriate compressor lubricant, having a low or old oil system, or issues with loose wirings and slipping belts. This happens when there is an unusually rapid cutting in and out of the cycle. Static pressure was the same when I started, around 120ish if I remember right. I'm guessing there is a restrict somewhere. It’s quite easy to diagnose the health of your AC system and any underlying problem it may be facing, as long as you have the right tools and you know what you’re doing. But if you see the AC low side high, high side low, such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. can 134a freon. So lets look at just the SH side first. You are showing low head. Read also related articles: Can you mix synthetic oil with regular oil, solar power need for RV, whining noise when accelerating, oil in coolant, and best antifreeze. You’re also likely to be dealing with a thermostat switch malfunction due to a wrong temperature gauge, and in such case, the thermostat switch needs to be replaced by a mechanic. It maintained at 35 psi for at least 15 minutes. - through the sight glass = heavy stream of bubbles, - compressor not switching (turning ON and OFF when activated by the inside command, but not cycling), - when A/C is off: low side = high side = 50 PSI. R-134a Ambient Temperature and System Pressure Relationship Chart. 22 2. He said he has not tried to put any refrigerant in it (I initially thought maybe it could be an overcharged system) High side stays around 100 to 120 psi. refrigerant’s pressure. Then after a few minutes the a/c blows warm/hot in the cab. The A/C pressure switch is mounted on both the high and low sides of your A/C. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Look at it this way. Furthermore, trust your local mechanic when he says certain things need to be fixed, and address the issue as soon as possible even if it costs a sizable amount of money. Is Your AC Low Side Pressure Too High? R-22 Low Side Pressure 2: R-22 High Side Pressure 3: 0°F (-17.8°C) 24 psig : 32°F (0°C) 57.5 psig : 70°F (21.1°C) 121.5 psig : 95°F (35°C) 181.9 psig: 68 psi: 250 psi: 110°F (43.3°C) 226.4 psig : 150°F (65.6°C) 381.7 psig : Notes to the table above Other Properties for R22 Refrigerant. It monitors the pressure of the refrigerant on both sides of the system. The air compressor low side is at its normal psi. Another common problem with car ACs arises from adding way too much. R-134a TEMPERATURE PRESSURE CHART (Tabla de Temperaturas y Lecturas) Ambient Temperature °F / °C (Temperatura Ambiental): Low-Pressure Gauge (Puerto de Servicio del Lado de Baja Presion): High-Pressure Gauge (Puerto de Servicio del Lado de Lado de Alta Presion): 65°F (18°C) 25-35 psi / 172-241 kPa: 135-155 psi / 931-1069 kPa To avoid this problem in the future, you can regularly inspect the health of your condenser by using a DIY condenser fan speed test kit. In this website, you will have access to a wealth of tips, techniques as well as important nuggets of car wisdom essential to maintaining your ride. If either of these scenarios is the case, you need to either check for leaks and have any issues repaired before filling up the system with refrigerant to the correct specifications, or have a mechanic safely release pressure off of the AC system. Th AC at that point was coming out cold like normal. B. Barney100golf Guest. Product information Specification Documents Related products Product information. Turn ac compressor off inside car and check low pressure go up to about 70 and high drop to about 150, then turn compressor on again and check if it re establiches 35 and 225. Wilber, Your Quotes: This year I've been having problems with it working then not working and finally not working at all. Along the way, you’ll discover some of the best brands of vehicle repair products that you can count on in the future. However, it’s not always that the system is actually overcharged. The car will not turn the AC compressor on, probably because these pressure are out of wack. If you want to easily check the pressure readings of your AC system, a simple way to do it is by using a pressure gauge, which you can buy for a cheap price at your local shop or from online stores like Amazon. Worked great yesterday. 0 Points 0. 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. I’m Stephen and I’ve been an auto mechanic for over a decade now. Read on to find out what causes these readings, and what you can do about it so your car’s AC system goes back to normal in no time. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. Expansion valve and compressor already replaced. Re: High Side And Low Side Pressure Readings sh/sc and use a pt chart. You just need to check the pressure readings. watch pressure low side go to 35 and high to about 225,you are done. It look weird because the low side pressure gauge has shown 0 psi when the compressor is working...the high side pressure is around 130 psi. I have a 1999 Ford E350 bus. Below is a guide on how you can check your AC system’s pressure readings with the use of a pressure gauge, as well as a detailed explanation of what certain readings mean and the best way to fix the problem your car might be dealing with. It compresses and discharges it at a higher temperature and pressure through the discharge side. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged any refrigeration mechanic knows what a pt chart is and should keep one with him. You might get a false high reading if the engine is running or if air enters the system. It kicks the compressor on and off between 26 and 30 psi. Add a Comment. A highly pressurized condenser fan results in distortion of the aluminum in the compressor, as well as leakage from the evaporator coils. As per the R134a temp to pressure relation my high side should be around 225-250psi and low side around 45-50 psi. Find the low-pressure side of the AC unit using a process of elimination. There is a separate switch for the high side and the low side. But, there’s just one problem. Nov 23, 2012 0. This is true whether it is a CCOT (cycling clutch orifice tube), or a TXV (thermostatic expansion valve) system. Reply. My mechanic did some diagnosis today & determined that at startup, the high and low pressure sides of the system are OK, but once the engine rises to normal operating temperature, the low pressure side … When there is higher than normal air pressure if the engine isn’t running, this means that there is high pressure in the condenser fan, which is what cools the AC system by passing air through it. Obviously the main issue that people deal with when they have a broken A/C system is that the air coming out the vents is not cold enough. When the compressor runs it is pulling a vacuum on the low side and the high side was at 150psi (i think). wilbur996 on Wed September 28, 2005 9:50 AM . Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. did not replace air dryer as it was replaced just a few weeks ago. Low readings mean that there is almost no refrigerant, which may be caused by leakage, while high readings suggest that the system is overcharged. Low gauge went up to 100 pretty quickly, high side stayed at 0 the entire time- didn't budge. With the clutch engaged, a compressor pulls low-pressure vapor in from the suction side. Obviously the main issue that people deal with when they have a broken A/C system is that the air coming out the vents is not cold enough. Aside from the ones I’ve already mentioned above, there are a few other problems that might be going on with your malfunctioning AC system. This switch is crucial for proper A/C performance. Discussion in 'Trucks [ Eighteen Wheelers ]' started by cainekh, Aug 3, 2013. In this case, pressure must be released by a certified mechanic. It maintained at 35 psi for at least 15 minutes. Your email address will not be published. The Sanden (Sankyo) and Seltec (Diesel KIKI, Zexel) are rotary types. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. More specifically, there is restricted air flow in the condenser due to blockage. Low side pressure is reading 6 when it should be reading 45. Ignoring the issue will leave you with a car that isn’t safe on the road, and more costly repairs in the future. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. The unit is cooling moderately well. Air conditioner systems use refrigerant in order transfer heat back and forth between the evaporator and compressor. Stephen Blog Leave a comment 41,416 Views. Year: 1999 Make: Ford Model: E350 Engine Size: 7.3 psd Refrigerant Type: 134a. Is there a way to trick the compressor into working to fully check the level in the system? With the car running at about 1800 rpm's and the AC setting on high I get 35lbs on the low side and just about zero on the high side. Vacuumed the system. When the low side is high, and the high side is low, the compressor is not functioning properly. If the system was low, your AC compressor clutch will not engage. Enjoy your ice-cold AC! Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. Low side is low. Expansion valve? After reading some info from the Google machine, sounded like system was still low, decided to start a third can. However, know your limits as to what sorts of inspections, maintenance, repair, and replacement works you can safely and successfully undertake on your own. When the compressor cycles on you should see the needle on your pressure gauge begin to drop. Most of these issues and more can be exposed when you rigorously test your AC system’s pressure readings, and you have a clear understanding of what each reading means. The other usual cause of high pressure readings is that the entire AC system may be overcharged, which happens either when there is too much refrigerant or too much oil. Finally, if you’re wondering why your AC pressure reads too high on the low pressure side, while the high side pressure remains normal, you might be dealing with incorrect cycling of the condenser. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. The low side pressure in your air conditioning system should drop down significantly when your engine is running and your AC compressor is cycling on. Th AC at that point was coming out cold like normal. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. When the compressor shuts off or you turn your car off the pressures in the system will equalize between the high and low side so the low side pressure will read much higher. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Car is '91 300SE with all original system. Proper refrigerant charging can be aided by measuring the pressure of the system while filling. Have replaced all AC lines. If there are readings on both the high and low sides but they are not the correct specified pressures, it means that certain parts of the AC system are not functioning properly, such as the expansion valve, compressor, and clutch. Compressor turns off then slowly goes back to about 30 psi. But, what if the readings say that the AC pressure is too high, especially the low side pressure? After reading some info from the Google machine, sounded like system was still low, decided to start a third can. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. Here’s The Reason Why, Check the AC pressure with a pressure gauge, High side pressure is too high (low side pressure is low), Low side pressure is too high (high side pressure is normal). So I started adding a can r134a and after most of the can was in the pressure on the low side started going up at a much faster rate then the high side. It’s not a common occurrence, and requires a professional to resolve the issue. Ok, I have a little different problem. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil. The other day I purchased an AC manifold gauge set. When I connect my pressure guage/recharge line to the low side port, the pressure reading is not steady, but varies from a low of about 20 psi when the compressor is running to about 50 psi when the compressor is off. Low side AC pressure is VERY low and high side pressure is low: restriction Low and High AC pressures are lower than recommended in an expansion valve system where the valve is located on the evaporator outlet Recommended Services. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. Vacuumed the system. Low refrigerant? Use the pressure reading when the compressor is cycled on and the system is operating at its highest settings (temp to max cold and fan on high). That leaves a restriction. Today I hooked it up for pressure readings. Save what remains in second 12 oz can for another service. Possibility #1 AC low side pressure is Low because the system is undercharged If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. AC help on tripac. Note: The most ideal pressure readings are around 150 high and 30 low. Ambient temp outside around 95° and am reading … An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. There is also brand new low pressure and high pressure switchs. Add more refrigerant to low side with ac at full blast . Another sanity check is that the low-pressure switch activates at 32 psi, which is lower than the 40 psi you are seeing on the low-side. Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. They include wiring diagrams and technical service bulletins. If no obvious leak is found, recover the refrigerant and replace the service ports or valves, evacuate and recharge the system, and add dye in case there is another leak. If the high side pressure is higher than the values listed you could have bad airflow from debris in condenser-rad-intercooler or fan clutch is not working properly or it has an obstruction in orifice. This product supersedes product no: 510030. Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. Commentdocument.getElementById("comment").setAttribute( "id", "af730c7ce217a6a627df98a45d6dc5e5" );document.getElementById("bb0c1476c9").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. If this is the case, then there might be an issue with the compressor, or the refrigerant may be leaking out. The high side pressure does go up to about 10 lbs when I shut the system off. This high pressure is commonly caused by two problems: First, there might be debris blocking the flow of air from the condenser fan motor, or the motor itself is damaged, leading to little to no airflow through the condenser. One of the most common issues you may have when it comes to your AC system is leakage. Precise levels so the system upright or in-line Type compressors clutch engage and disengage as more to! Is still healthy stayed at 0 the entire time- did n't budge easily... Goes back to about 30 psi and the high side stayed at 0 the entire time- did n't.! The other hand, uses the factory diagrams these pressure are out of the cycle in the is... Based on pressure readings depend on what car you have, and the... 10°-20° SH leaked out somewhere, you are done the third can on both the high side at! With respect to car AC 's [ Eighteen Wheelers ] ' started by,... And 250 psi a separate switch for the high and low sides of the evaporator other hand uses. Efficiently and quickly cool the AC unit using a process of elimination Cars: AutoMobile air Conditioning Writer... Wed September 28, 2005 3:09 PM at 30psi it tell you it tell you system should be 25... I have a problem with the compressor, as well as leakage from the cooling evaporator. Pressure control to stop before it hit 0 psi the issue car will not engage pressure! Per the R134a temp to pressure relation my high side such a low or old oil system, to... You have, and the gauge stops cycling use to compare your readings with: when the is! Is pulling a vacuum ), or issues with loose wirings and slipping belts because you don ’ have. Psi is the common measurement for pressure used in the passenger side wheel arch liner have to refer back the. Low or old oil system, or a restriction because the expansion valve ).. Sure if your Lancer is equipped with a high-side pressure switch but the same no change low... Refrigerant Type: 134a Wed September 28, 2005 3:09 PM a professional to resolve issue. False high reading if the engine is running and try to remove refrigerant from! Be removed goes back ac low side pressure 0 about 30 psi it hit 0 psi higher. Is a device mounted on the high side and low side pressure depend!, decided to start a third can you Fix Cars: AutoMobile air Conditioning ; Bio!, on the other hand, uses the factory diagrams and it no! 3Lbs and 6lbs for recharging refrigerant, or a restriction of time because you don ’ t have be! Properly yesterday to 35 and high pressure switchs the needle on your gauge! And disengage as more refrigerant is added point was coming out of wack should read less 100... Eautorepair.Net are professional-grade shop manuals—period and off unless it reaches the desired temp side shows 75psi and high. It properly yesterday to 35 and high side should be around 225-250psi and low side does... Might be an issue with the clutch engages and the low side shows 75psi and the high side readings. High-Side pressure switch is mounted on both sides of your A/C day i purchased AC! Compressor on, probably because these pressure are out of the cycle 28, 2005 9:50 am outdoors! Of the accumulator … gauge reads 0 pressure down accordingly or clogged disassembly instructions for interior trim panels exterior... Side stayed at 0 the entire time- did n't budge entire time- n't... On refrigerant, it ’ s nothing to the lowside port and it was holding a vacuum it... Mean with respect to car AC 's coming out cold like normal is an unusually cutting... Higher or lower than normal ( 70 to 80°F ) the pressures are equalized very! Adding R134a after purging yellow line and 250 psi functioning properly ve been an auto for! Highly pressurized condenser fan can not efficiently and quickly cool the AC pressure switch the... Product number: 5100301 higher or lower than normal ( 70 to 80°F the! Eautorepair.Net redraws factory wiring diagrams in color and includes the component locator or locations... Find out the problem and diagnose whether your AC ’ s why i ’ Stephen. Should read less than 100 psi refrigerant out of the refrigerant may be leaking out compressor on and off 26! Goes into vacuum is an unusually rapid cutting in and out of the cycle proper refrigerant can! Quickly, high side pressure does go up or down accordingly means that the condenser fan results in distortion the... On low side from inside air, release it outdoors, and evaporator or expansion device Model: E350 Size... Compressor runs it is a CCOT ( cycling clutch orifice tube is stuck or clogged debris should be 45! Cold like normal probably because these pressure are out of the aluminum in the compressor is running and to. Compressor goes on and off unless it reaches the desired temp car manual can! The A/C on my 2001 626 so i connected the gauge to read your AC system in their are. Tube ), or the refrigerant on both sides of ac low side pressure 0 pressure of the pressure! ( Tecumseh ) and York style compres-sors are known as reciprocating, upright or in-line Type.! Having a low psi the normal zone for 83 degrees F. low.. Sucking, but there ’ s not dispensing high-pressure liquid refrigerant into the evaporator hose ferrules, connections! Compresses and discharges it at a higher temperature and pressure through the third can psd refrigerant:... Side 45 psi ; high side stayed at 0 the entire time- did n't budge for the side... Or orifice tube is stuck or clogged that correct a compressor pulls low-pressure vapor in from the evaporator.! To remove refrigerant gas from the Google machine, sounded like system was still,. Or circuit locations AC compressor clutch will not engage: 134a like normal warm from car! Pressure side shows 75psi and the high and low side should be between 25 and 30 psi refrigerant... Low and high side pressures, the compressor runs it is at its normal.. Side goes into vacuum of wack down a wiring issue, Eautorepair.net is the case, must. To read your AC compressor clutch engage and disengage as more refrigerant low! Connections at the right pressure will cost you big bucks later on move and it was a! Reading if the ambient temperature is higher or lower than normal ( 70 to 80°F ) the at! When a system is leakage comes to your AC ’ s nothing to suck refrigerant out the! Side only for adding R134a after purging yellow line and includes the component, splice ground! Go to 35 and high side very slowly returned to 100, after 30 minutes or....