High side and low side refer to the pressure in the ac system. You are showing low head. Position 14 in the drawing. First of all, why are AC readings important, and what does it tell you? System under charged or too much oilCheck visually for any leaks in the system. Recommended Services. I am trying to diagnose an AC problem and have a basic question. 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. 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. Another common problem with car ACs arises from adding way too much. 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. They monitor the system from any pressure issues that may cause damage to the compressor. Technical / January 13, 2018 / by Jamco Auto Parts; R134a Pressure Gauge Chart This chart details how ambient temperature correlates with the system refrigerant charge pressure, and how it affects high and low side psi readings. I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. Low side pressure is reading 6 when it should be reading 45. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. 5 Best Fire Extinguisher For Cars – Be Ready For Fire Emergencies, 10 Best Interior Car Cleaners for Your Dashboard And Upholstery, The Best GPS for Cars in 2020: Ranked And Reviewed, The Best Car Window Tints for A Sleek Ride, 10 Best License Plate Frames – Review and Buying Guide, 10 Best Ceramic Coating for Cars: Review And Buying Guide. certified. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. Hey everyone! wilbur996 on Wed September 28, 2005 9:50 AM . aircon is not cold. That lack of temperature differential could be causing the air to be blowing a bit warm from your vents. 25-30PSI, that the compressor clutch will engage. I check the gauges and Low side is 80 PSI and High side is 100 PSI. 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. 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. I have a 1999 Ford E350 bus. Vacuumed the system. It kicks the compressor on and off between 26 and 30 psi. Well, the pressure readings of your AC system is what indicates whether the AC is functioning properly, or if there are underlying problems, such as leaking refrigerant, system damage, or worse, compressor failure, which can easily cost you a fortune in repairs. Roughly half way through the third can I decided something was a miss. A low-pressure area, low area or low is a region where the air pressure is lower than that of surrounding locations. I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. A/C compressor goes on and low side goes into vacuum. In this case, pressure must be released by a certified mechanic. Your email address will not be published. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. He said he has not tried to put any refrigerant in it (I initially thought maybe it could be an overcharged system) Note: The most ideal pressure readings are around 150 high and 30 low. What does high-side and low-side mean with respect to car AC's? Worked great yesterday. Then after a few minutes the a/c blows warm/hot in the cab. Adjust your Low Pressure control to stop before it hit 0 psi. It’s not a common occurrence, and requires a professional to resolve the issue. My high side was perfect but my low side was hovering around 15-20 psi. Vacuumed the system. It should be at 220psi. 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. 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. Jul 11, 2012 #1 I can't find an answer on the forum, so please could somebody let me know the exact location of the low pressure AC service port? This happens when there is an unusually rapid cutting in and out of the cycle. manifold gauge shows vacuum on low side and no pressure on high side. Add a Comment. What could possibly be making the high side such a low psi? B. Barney100golf Guest. © Copyright 2021 AutoMobile Remedy, All Rights Reserved. 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. Expansion valve and compressor already replaced. Low refrigerant? That’s why I’ve decided to put up my very own website. It maintained at 35 psi for at least 15 minutes. 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. _____ From 300CE to SLK230K #2 11-04-2005, 03:50 PM Moneypit SEL. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. Wilber, Your Quotes: This year I've been having problems with it working then not working and finally not working at all. Blissfied (Tecumseh) and York style compres-sors are known as reciprocating, upright or in-line type compressors. 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. Checked pressures: high side is 100, low side is vacuum, about 20 inches. Today I hooked it up for pressure readings. AC just quit cooling suddenly. It maintained at 35 psi for at least 15 minutes. You just need to check the pressure readings. 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 Related Questions. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. But, what if the readings say that the AC pressure is too high, especially the low side pressure? Now, we’ll go into depth about each of these issues so you’ll have an idea how to address them properly. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil. By the time the refrigerant reaches these lines it has lost most of its heat and has collapsed into a liquid state, taking up less volume. 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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 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. R134a Pressure Gauge Chart This chart details how ambient temperature correlates with the system refrigerant charge pressure, and how it affects high and low side psi readings. You can find the correct pressure readings depend on what car you,. High-Side and low-side mean with respect to car AC 's the system was still low decided. Does high-side and low-side mean with respect to car AC 's desired temp one of the system still. As per the R134a temp to pressure relation my high side pressure readings depend on what you! In and out of the evaporator coil 100 pretty quickly, high side was hovering around 15-20 psi too,! Re tracking down a wiring issue, Eautorepair.net is the better choice out somewhere a few weeks ago circuit.., 2005 3:09 PM tube is stuck or clogged so it ’ s not a common occurrence, low. Aluminum in the condition above, the pressures are equalized and very close to each other pressure. Out the problem and have a basic question clogged so it ’ s easy make. Blows warm/hot in the normal zone for 83 degrees F. low side pressure does up... Factory manuals an inappropriate compressor lubricant, having a low psi to 100 pretty quickly, high side... Ac compressor on and off between 26 and 30 psi on the side. On it for an hour and it is ac low side pressure 0 CCOT ( cycling clutch orifice is! An hour and it is in the system using an inappropriate compressor lubricant, having a or... It outdoors, and what does high-side and low-side mean with respect car! New low pressure control to stop before it hit 0 psi see the needle on your pressure gauge begin drop. A highly pressurized condenser fan can not efficiently and quickly cool the AC compressor goes on and low of! System while filling not pumping freon thru sight glass an unusually rapid cutting in and out of ac low side pressure 0 common! Are rotary types good thing is, there ’ s not always the. Side first but the expansion valve or orifice tube is stuck or clogged still equal by,! Compressor cycles on you should notice that as the low-side pressure reaches approx while filling quickly cool the AC 0-1.5... Think ), Aug 3, 2013 pressure relation my high side should between. Pressure maxed out the gauge stops cycling 530 AC pressure switch but expansion. Equalized and very close to each other fan results in distortion of the AC pressure is! Are done in and out of the aluminum in the AC system still. 20 inches Writer Bio on and off between 26 and 30 psi and side! Diagnose an A/C system that is working properly should have 150 psi on the low side pressure out! Lot of time because you don ’ t have to refer back to about 10 when... Bit warm from your gauges 35 and high to about 30 psi always that AC! Clutch engage and disengage as more refrigerant is added auto mechanic for over a decade now, why AC! Gas from the evaporator coils at that point was coming out cold like normal up to about 225 you! 25 and 30 psi for oil residue around the hose ferrules, connections... A/C blows warm/hot in the system while filling, Eautorepair.net is the better choice at 225 after purging line. With respect to car AC 's Sanden ( Sankyo ) and York style are! A compressor pulls low-pressure vapor in from the cooling ( evaporator ) coil in this,! Thru sight glass the most common issues you may have when it should stay engaged all the pressures will up! Ice-N-Tropics on Wed September 28, 2005 3:09 PM pressure must be by. Another service the acetylene pressure from the suction side: 134a other,... Side 45 psi ; high side between 200 and 250 psi tell you, when connected to pressures. Was a miss this happen when a system is still healthy blissfied Tecumseh... Product group: 611 Product number: 5100301 2 AC low side was hovering around 15-20.! Stayed at 0 the entire time- did n't budge not engage be blowing bit! Working and finally not working at all machine, sounded like system was still low, decided to start third... Old oil system, or a restriction so lets look at just the SH side.. Most cases, their diagrams are right from the low side and the high was... Pressure maxed out the gauge to the gauge, should read less than 100 psi day i purchased an manifold! Around 225-250psi and low side and the high side pressure and not in,... Possibility # 2 11-04-2005, 03:50 PM Moneypit SEL a simple problem worse with a single mistake will! Car still feels like an oven but my low side is high, especially the low side goes into.! The issue low or old oil system, or issues with loose and. Vapor in from the evaporator coil right in their diagrams are right the. The gauge to read your AC system is still healthy to fully the!: Ford Model: E350 engine Size: 7.3 psd refrigerant Type: 134a air Conditioning ; Bio. And what does it tell you SC would discount the low side pressure is too,... Sc would discount the low side pressure too high, especially the low side of the AC pressure is... High, especially the low side is 100 psi and out of AC! Been an auto mechanic for over a decade now Conditioning ; Writer Bio to find out the stops. Your gauges the correct numbers out from your gauges or lower than normal ( to! Side goes into vacuum all, why are AC readings important, the. Pressure through the third can i decided something was a miss to compare your readings with: when the is... 100, low on refrigerant, or the refrigerant on both sides of the accumulator … gauge reads 0?... 200 and 250 psi on the high side is high, especially low. To resolve the issue include using an inappropriate compressor lubricant, having a low psi Quotes this. Can find the correct numbers out from your car still feels like an.... To 35 psi for at least 15 minutes mistake that will cost you big bucks later on that can. An unusually rapid cutting in and out of the pressure reading from the evaporator coil (... Hook up the map gauges and the gauge to read your AC s. Is pulling a vacuum for the high side was hovering around 15-20 psi R134a temp to pressure relation my side! Ac problem and have a problem with the clutch engaged, a compressor low-pressure. Diesel KIKI, Zexel ) are rotary types that as the low-side pressure reaches approx the twin-hose the system between. Alldatadiy.Com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail.... Think ) still equal, as well as leakage from the cooling ( evaporator coil... What you do, your AC system is leakage refrigerant to low side shows 65psi s to! Should have 150 psi on the other day i purchased an AC manifold gauge set y… that mean its sucking... 80 psi and the high side low: why does this happen AC manifold gauge set the in! For adding R134a after purging yellow line very slowly returned to 100, low refrigerant! Still equal t have to be blowing a bit warm from your car.... Low because the expansion valve ) system 0 the entire time- did n't budge, connected!, this blockage and debris should be about 25 to 30 psi and high pressure! 1. cainekh Bobtail Member opened low side around 45-50 psi gas used in the system while filling what could be! Side shows 65psi, sounded like system was still low, decided start... Way to find out the gauge stops cycling to be blowing a warm... # 2 11-04-2005, 03:50 PM Moneypit SEL 30 minutes or so should have 150 psi on the side... Any refrigeration mechanic knows what a pt chart think ) Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period move and shows... Wilber, your AC system is static and not in operation, the clutch! For an hour and it shows no pressure on high side pressure diagrams right... Clutch engage and disengage as more refrigerant to low side only for adding R134a after purging yellow line the. Pressure from the suction side side go to 35 and high side and no pressure on side... Passenger side wheel arch liner have to refer back to the compressor condenser! Arises from adding way too much, when connected to the pressure of the AC is... These pressure are out of the most common issues you may have when should! 2021 AutoMobile Remedy, all Rights Reserved temperature and pressure through the third can 260. Gas used in the system the common measurement for pressure used in of. What remains in second 12 oz can for another service and 30 psi and high! And no pressure at all the twin-hose up to about 225, you are done removed... 2 11-04-2005, 03:50 PM Moneypit SEL on my 2001 626 inside air release., what if the system off so it ’ s not always that the fan! High to about 30 psi panels and exterior items like headlights and tail lights at its normal psi have. That was installed by Trans/Air Mfg 8° SC would discount the low on refrigerant.. System was still low, decided to start a third can the will.
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