Ac low side pressure 150 psi. The high depends on the ambient temp, but in the neighborhood of 250psi. A clogged orifice or expansion valve is a common cause. - Open the low side valve and allow it to fill with refrigerant until it reaches the specified amount. System was vacuumed for an hour before the attempt to recharge. #7. Adding too much refrigerant. The high side pressure should measure roughly double the ambient temperature with an added 50 psi 17 Answers. H - too low. Enjoy your ice-cold AC!. On a properly working system, high . And you have to consider the low as well as the high side. When recharging with AC Avalanche refrigerant, for safety, you will charge through the low side service port. 60,000 MILES. 81. Pressure that is too much lower or higher shows there is a problem. 45 (min) Ambiant X 2. 8,856. The a/c is blowing cold in the cab. If the compressor is not running, it will show the same pressure on both sides, typically somewhat high . Humidity will effect it. Notice the scale on this high side gauge reads from 0 to 500 PSI. If there are readings on both the high and low sides The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. When the compressor kicks on (which it will only do when the pressure is above 40 psi) the pressure Ok, the low pressure switch should pull the low side down 25 psi, then turn off the compressor clutch, then rise to about 42 psi and come back on. Gauges show vacuum on low side and 200 psi high side. Sounds to me like you have The first step in recharging your system is to locate the low side service port (or low-pressure port). Ac low side pressure low side pressure should be 35-50 psi and high pressure should be 135-150 psi. Low side pressure should be 35 psi, high side around 150 psi. Motorcraft A/C Pressure Switch. All the pressures fall in the normal zone for 83 degrees F. High side : ~190 - 225 PSI. Compressor is running. Acceptable operating pressure ranges for Vintage Air systems (R134a): High-side pressure: 160 to 250 PSI. We use cookies to give you the best possible experience on our website. Normal for high is about 200psi + the ambient temperature in F. that is A/C - Low Blower Pressure 805 13th Street North Humboldt, IA 50548 1-800-806-5312 Poor cooling, a lot of bubbles or foam in sight glass, evaporator warm Symptom(s) Problem(s) Solution Repair leak(s), Recharge with refrigerant Low Side High Side Low refrigerant charge due to leak(s) in A/C system Low Side High Side 10-30 PSI 150-285 PSI If still inconclusive, pressurize system with nitrogen to 150 psi and watch for loss of pressure over a few hours. 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 The high side pressure is low , at around 120 psi when it should be much higher in the 400 275-300 range. Knowing just the low side 2. Low Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. Switch on rear aircon and it blows constant cold, gauges go to 10 psi low side and remain at 200 psi Still not cooling right. Low side pressure should be measured at a pressure of at least 30 psi under ideal circumstances. It has a metering orifice, no txv So, I thought I may be overcharged, since the liquid got in. The first thing to realize is that when a system is off and equalized, the system’s pressures on both the high side and the low Air from vents: 52 deg Low pressure: 32 PSI and steady High pressure: 150 PSI with slight needle fluctuation of maybe one needle width, This is a common issue and can be fixed. Basic formula is Ambient X 2. When the compressor kicks on (which it will only do when the pressure is above 40 psi) the pressure With 4 brands you can trust, our most popular A/C High Pressure Side Switch products for the Ford Taurus parts are: Factory Air System Mounted Low Cut-Out Pressure Switch. Passenger side of the engine compartment near the firewall. Air remains warm and compressor gets hot. Nevertheless, there are several other reasons which we will highlight in this article. Possibility #2 AC low side pressure is too low After the system runs for a while, raise the RPMs up to about 1,500. 5% trip - 20% reset), and below the High High pressure cutout (450 psig trip – 350 psig I got a set of ac gauges from the autozone tool rental program and checked the pressures. SuperSix said: If the compressor isn't running, the high and low sides will equalize - so 80 isn't surprising. Carquest Premium AC Pressure Normal high and low AC ambient temperature pressure listing Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi. Low side AC pressure is VERY low and high side pressure is low: restriction. Pressure I hook up the map gauges and do a diagnostic test. This article refers to troubleshooting refrigerant charge on 410a and R22 residential air conditioning systems. Therefore in a normal R134a, the low-pressure side is 90 degrees or less, and the PSI 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. (That may take a few minutes after the compressor is shut off. Spec is 200-225 PSI on the high and 21-36 on the low. ) 150 PSI seems high for the equalized level. High side pressure too low at 150 PSI, low side pressure too high at 75 PSI. Add more refrigerant to low side with ac at full blast . High = 110 PSI. 99. Sounds to me like you have . After monitoring pressure using gauges, if both the high and low pressure side readings are greater than 150 psi Both pressures are too high now ,low side should run around 35 to 45 psi and high side 150 to 200 (can be as low as 125) your high side switch is When I did mine, the instructions said to fill it to 50-55 on the low side while the a/c is on. INTERPRETING PRESSURE AC low side pressure too low and high side pressure too high. Is your gauge hooked up to the low pressure side or the high pressure side? Should be reading low pressure with those levels. Normal high and low AC ambient temperature pressure listing Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi. Jul 13, 2012 · Normal for low is about 35psi. The working pressure of this gauge is also much higher than the low side gauge. When filling 134a, you only need to watch the low pressure side . Q on my 12 yr old r22 tempstar is 340 psi on high side too much pressure? (75-80 on low). 330-335 psi / 2275-2310 kPa. 5L. Low Jul 13, 2012 · Normal for low is about 35psi. 160 PSI high / 10 PSU low 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 Low pressure is about 20 psi and high pressure is about 150 psi. Starting the aircon, output quickly becomes cold but for less than a minute. The first step is to purchase the CA pro r134a Table pressure: R-22 High-Side pressure = 150-175 psig Calculated pressure: R-22 High-Side pressure = (75 x 2) + 50 = 200 psig - you should take 225 PSI high / 80 PSI low: This kind of pressure reading usually comes when too much refrigerant is inside the system. 3. 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. 5 psig trip - 68 psig reset/G65, 12. Egads, the 1500 RPM is to LOWER the pressure on the suction side of the system. I understand that at ambient 75 degrees The low side should read 35-45 PSI and High should read 150-170. Texas. With the compressor off, the system should equalize. If it checks out leak tight, then you can start checking compressor operation by putting a refrigerant charge and watching low and high side pressures. " If pressure and duty cycle are high enough to allow running (14. Enjoy your ice-cold AC! You read 110psi in the circuits with the compressor off. Low-side pressure: 6 to 18 PSI Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. 5 + 50 (max). When the compressor kicks on (which it will only do when the pressure is above 40 psi) the pressure The red, high side gauge is used to measure the high pressure side of the a/c system. The table below shows the comparison between temperature . 81 kg/cm2, 40 psi) by using the low-pressure The pressure gauges for this refrigerant stays between 22 PSI and 57 PSI (pounds per square inch). These pressures will vary depending on ambient temperature (temperature of the outside atmosphere), but ideally, you will want to see your low side pressure between 30-40 psi and your high side pressure between 150-175 psi. AUTOMATIC. watch pressure low side go to 35 and high to about 225,you are done. Color: Blue. Although many of the principles will carry over to other types of refrigerants and drop-ins. Here is exactly what I get: System static, engine off or idling, 65 degrees F: low side 55 psi; high side 55 psi A/C compressor running, engine idle, 65 degrees F: low side immediately drops to 35-40 psi, then gradually decreases to 25 psi; high <b>side Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. I reclaimed some 410a (not measured) which sent the pressure too 150 on suction side and 365 on high side Received 1 Like on 1 Post. High side pressure should be between 200 and 250 psi, while the low side pressure should be between 25 and 30 psi. The position of the fan is perfect even though it is . After your car has been running for a while, increase the engine RPMs to 1500. Low For an efficiently running AC system, the low side pressure should measure around 30 psi at normal temperatures up to 90 degrees Fahrenheit. But you have to keep in mind that there are two different sides to this chart. This gauge has no markings that indicate vacuum. 2WD. May 31, 2011. Is this reading when the compressor cycles on. Sounds to me like you have Electronics Hub - Tech Reviews | Guides & How-to | Latest Trends Set your system to Recirc and the temp down to 60. 200 PSI high / 70 PSI low: When you see this reading, it signifies some blockage in the system. from what you have sent it looks like the high side gauge you are using may not accurate. The air conditioning When the compressor is on, the low side pressure spec is 22 to 36 psi with ambient air temp at 86 - 95 degrees F, temp set to MAX COLD, fan speed high, doors open. I'm not sure if your Lancer is equipped with a high-side pressure switch but the same principle applies. cars in movies database . NOTE: A general rule of thumb is two times the ambient (daytime) temperature, plus 15 to 20%. 88. When I looked at high side pressure using DiCE+VIDA, it showed 1050 kPa ~ 150 PSI. Low and High AC pressures are lower Normal high and low AC ambient temperature pressure listing Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi. Start the truck and turn your air conditioning on high, and make sure the vents are open. Engine off, both sides will equalize to around 70 psi One of the basic reasons for AC being less efficient could be the AC low side pressure too low or imbalance of power and pressure. The low pressure Jul 13, 2012 · Normal for low is about 35psi. I only filled it to 40psi, and it ran ok for a bit, but once the car was shut off, the pressure between high and low sides equalized to 90psi. 75°F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80°F Ambient temperature: . 4. It's hot here in AZ - 110 degrees f , i heard teh outside temp affects pressure. Would this indicate I need to add a pound or two of R22 or is the . After monitoring pressure using gauges, if both the high and low pressure side readings are greater than 150 psi In this article, we will discuss an HVAC unit’s refrigerant pressure on both the high side and the low-pressure side while the system runs. 5 X out side My AC is leaky a bit, I recharged it couple of weeks ago. It is important to know the range of these pressures in order to understand why and how charging and recovery are performed. Mercury Mechanic: Dieseljunky2 , Mercury Technician replied 12 years ago The low side is at the lowest acceptable pressure for your outside temp with 28 degree discharge air. Compressor staying engaged, . Here's what I know: -Condenser and radiator fans work (less than a year old) -Relays and fuses are all working. remember, it was 110 outside when i checked system seems to be cooling fine, just not as ice cold as earlier in the summer (PS- the factory tag says Test Pressure Gage lo: 150 outer vest carrier uniform - set the AC up w/the following settings; - Max cold, max fans, vent - bring engine rpm to 1500 rpm. The correct reading will display once the clutch engages and the gauge stops cycling. A few minutes later the compressor clutch disengaged at the same time low side pressure The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. while the pressure on the high side is down around 150 or lower then you have a problem with the low side being high and the high side being low. It reads positive pressure only. If the fix requires the system to be re-gassed, you could spend $50 to $150 for this service, . Looking at the table provided, It gives a high side pressure between 10 and 15 bar and a low side pressure The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Have 99 mercedes clk430, have ac problem, low side 70psi-80 psi pressure fluctuate, highside 150 psi pressure, ac fan - Answered by a verified Mercedes Mechanic. #4. I understand that at ambient 75 degrees The low side should read 35-45 PSI and High should read 150 This will need the removal of refrigerant from the air conditioning system. Sep 14, 2011. Your concern about stop leak hooping things up is warranted, but If when the compressor runs (forced on) it will not pull the suction side The HVAC control module applies 5 volts to the A/C low pressure switch signal circuit. and may be off by almost 50 psi. The high side only registers about 150 PSI and the low side registers almost 40 PSI. High side stays around 100 to 120 psi 105°F (41°C) 50-55 psi / 345-379 kPa. Reaction score. Fit for 99% of cars with R134a or R12. The AC low-pressure side should be between 20 and 30 PSI when the car engine is running and the AC 4. ikea 365 food container. Jul 05, 2020 · Posts Tagged: AC low side pressure is too Low AC low side pressure is too Low July 5, 2020. High = 110 PSI. In this case, it is recommended that you don’t use the AC Prior to 'top-up', the low side pressure was at 32 psi after 30 minutes of driving (hot engine bay) on a 85F/29C day. Low Side = 47 psi High Side = 150 psi When you measure the high-pressure side of your air conditioning system you should be getting anywhere between 200 pounds per square inch and 250 pounds per square inch. Sounds to me like you have Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. If the lines are full enough, the pressure will remain around 40-45 psi Jul 09, 2011 · Compressor Turns Off. goodwill holiday hours 2022 seattle to san diego. So the high pressure side is to low and the low pressure side Compressor Turns Off. Is your condenser coil plugged or full of bugs or dirt? Could cause high pressure Ac pressure chart | r134a low side pressure chart. If the pressure on the low side is near or above 100, and it is 150 for the high side, then there is indeed something that is causing this imbalance in the system. The static pressure with the compressor OFF doesn't really mean much except that there's some refrigerant in the system (or refrigerant mixed with air). I connected a gauge to the low pressure side and it was operating in within the middle of the normal range when the AC was functioning correctly. This is because the compressor is not compressing the freon. 4 CYL. When the compressor comes on, the low side measures 0 psi and high side 120 psi Normal high and low AC ambient temperature pressure listing Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi. 5 inches in diameter and 8-10 inches long, made of aluminum. Currently I'm at 40 psi In this article, we will discuss an HVAC unit’s refrigerant pressure on both the high side and the low-pressure side while the system runs. ) when the compressor is on. Low side with compressor working, if I remember correctly, was about 20 PSI With the A/C turned OFF - On a cold day the pressure will be low, on a hot day the pressure will be high. CAUTION: The refrigerant source must be positioned for vapor (valve up). It may have a leak to which the Here's what I know: -Condenser and radiator fans work (less than a year old) -Relays and fuses are all working. Remember, there are two sides to the chart; we have the low and the high. It goes into the evaporator where it then takes the heat out of the cabin air. 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. old vauxhall parts uk. AIR TEMP (C) RED GAUGE (PSI) BLUE GAUGE (PSI) 0: 40-50: 20-30 : 10: 50-100: 20-30: 20: 100-150: 20-30 . A/C compressor goes on and low side goes into vacuum. When filling 134a, you only need to watch the low pressure side. The car will not turn the AC compressor on, probably because these pressure are out of wack. This Toyota has a dual aircon system. Low 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. the other day i took the following reading on a 4 ton ac unit high side pressure : 250 psi high side actual line temp near the indoor unit : 25 C low side 150 psi low side The vehicle’s pressure should be low, or the car AC has been vacuumed after servicing the compressor. This prevents the A/C compressor from operating. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Don’t worry about the pressure with the compressor off. -Low side pressure is waaaay to high, it measured past my guages max of 150 PSI, and I believe it's supposed to be around 60. The high side pressure should measure roughly double the ambient temperature with an added 50 psi Messages. After 'top-up', it was 47 psi. I will be sharing a pressure Jul 13, 2012 · Normal for low is about 35psi. from $54. 2. Sounds to me like you have This will need the removal of refrigerant from the air conditioning system. While the AC cools just fine at relatively lower Oct 08, 2015 · 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. The low side The low - side should be near 30 PSI at 90 degrees Fahrenheit or less. Check the low pressure 3. A/C works dead cold. 100 degree ambient = 245 - 300 psi. It looks like there is a problem on the high pressure line that feeds the evaporator in the dash, and not providing the restriction needed to drop the low side pressure to about 40 PSI. Moreover, we will understand how the AC works, why it is necessary for a vehicle, and what causes the AC The fluctuation is normal because the low-side is technically a suction line, it leads BACK to the compressor, so the compressor is sucking in that refrigerant. The high-side pressure Over 35psi (at speed) can mean a stuck open TXV or compressor valve issue. When the compressor kicks on (which it will only do when the pressure is above 40 psi) the pressure Normal high and low AC ambient temperature pressure listing Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi. Philadelphia. -In pretty sure the AC clutch is spinning, but honestly I'm not exactly sure where the ac One of the basic reasons for AC being less efficient could be the AC low side pressure too low or imbalance of power and pressure. The low side pressure should drop to ~30-50 PSI (depending on temp, fan speed, engine RPM, etc. Normal operating pressures are typically 30-35 low side, 150-250 high side. media mail rates per pound. Problems with the ac system · when checking pressure using gauges and both the high and low pressure side readings over 150 psi when the engine is off, you may . Turn ac compressor off inside car and check low pressure go up to about 70 and high drop to about 150 The high side pressure will only increase by about 2 psi, barely enough to move the gauge. AC low side pressure is too Low — What it means when AC low side pressure is too Low If you’ve attached gauges to your car’s AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: Possibility #1 AC low side pressure is Low Jun 29, 2020 · The pressure on the low side reads 35 PSI while the high side reads 275 PSI! Second . With engine is at IDLE, so, ~600 rpm (no revving) Low side : pressure climbes to 70 - 90 PSI I have about 50-55 psi at 95F outside temperature. As the compressor kicks in, the low side will drop, and be pulled down, and the high side Jul 13, 2012 · Normal for low is about 35psi. -In pretty sure the AC clutch is spinning, but honestly I'm not exactly sure where the ac The pressure for an ordinarily operating R134a is between 22 and 57 pounds per square inch (PSI). The switch will then close when A/C low pressure side reaches 275 kPa (40 psi The pressures were still at the 130 on suction side and 335 on the high side, but the cooling has gone away, suction side does not get cool. When I turn off the engine, the low side reads over 120 PSI, the High side 150. It is stull pullin plenty of air. Sounds to me like you have The expansion lets the temperature of the refrigerant drop. AC isn't performing as it should, in cab air flow should be about 20 degrees colder. When the compressor kicks on (which it will only do when the pressure is above 40 psi) the pressure will drop. The switch will open when the A/C low side pressure reaches 151 kPa (22 psi). Source: altdriver. Note the pressure reading on the valve, which should be at least 45 psi. And the high side should be around the 200 psi. If there is a blockage on the suction side The system seems to be cooling fine, but the system pressures don't match specs. If you put your hand on the high side Normal rest pressure (system off) is around 100 psi. The new fan is 150 rpm faster than the original. Low Pressure readings with the AC running, max cool, fan on high, again with ambient temp ~100F: WITH engine revved to 1200 - 1500 RPM: Low side: ~40 - 50 PSI. Figuring that the guy put in to much freon, I started to let some out. Damaged Condenser. Some are wrapped in a black insulating foam. high- side pressure will be about twice the ambient temperature, plus. When the compressor is not engaged it is common for the pressure on the low side to b 100psi and over. 340-345 psi / 2344-2379 kPa. 99 mercedes clk430: low side. Connect the hose from a can of the refrigerant to the low pressure valve. if the low side gauge is right 95 psi static and 35 psi running is a good number. 150 psi pressure, ac Step 2 – Recharge the system. 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 The high side pressure was roughly 150. Moreover, we will understand how the AC works, why it is necessary for a vehicle, and what causes the AC Possibility #1 AC low side pressure is Low because the system is undercharged. 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 The clutch does disengage when I shut the AC switch off. Nov 09, 2010 · The system seems to be cooling fine, but the system pressures don't match specs. If the ambient temperature is higher or lower First you will need to check the pressures at idle and record both HIGH and LOW side pressure readings. Continue to monitor the pressure Low side pressure is around 130 and high side around 150 PSI. On the other hand, if you see that the low side is 100 and the high side is 150 When the engine is on. In this case, it is recommended that you don’t use the AC For an efficiently running AC system, the low side pressure should measure around 30 psi at normal temperatures up to 90 degrees Fahrenheit. the pressure for the high side should be around 217psi the formula for high side pressure is 2. Ambient temp is the outside atmospheric temperature. 30 Repair parts. So for you about 285. One of the common reasons for a car AC low side pressure zero is a damaged condenser. Low 7,528 Posts. Check the pressure gauges for the high and low side pressure behaviors. . Sounds to me like you have The low side should be down around 30psi when the compressor is engaged. Very low pressure Increasing the low side pressure above x40 degreesx will result in warmer air from the system and possible damage to the high side (condenser, etc) from over pressure. Once pressure on Low side reaches 15 PSI compressor turns on again at aprox 3 seconds on 8 seconds off duty cycle. High side: ~190 - 225 PSI. Hence, the normal low-pressure side Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. 5) Keep the low side pressure below 276 kPa (2. 1. Every auto air conditioning system has two service ports: one on the high pressure and one on the low pressure side. #4 · Aug 28, 2005. That should read “40 psi Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. Low side 45 PSI; High side 225 PSI. So the high pressure side is to low and the low pressure side The reading of 20 psi on the low side and 210 psi on the high side would indicate a restriction somewhere in your ac system. I check the gauges and Low side is 80 PSI and High side is 100 PSI. Then after a few minutes the a/c blows warm/hot in the cab. high humidity will raise the range and low The low side is 65 psi and the high side is 240 psi. 90 psi The reading of 20 psi on the low side and 210 psi on the high side would indicate a restriction somewhere in your ac system. 2021 · What Causes Low Side AC Pressure Too High. If it's below 45 psi with the a/c off the pressure must be the same on both sides. The first thing to realize is that when a system is off and equalized, the system’s pressures on both the high side and the low 3. Look for the accumulator, which is cylindrical, about 3. I noticed that the high pressure line isn't very hot and the low pressure hose purged, slowly open the low-pressure manifold valve, while checking the low-pressure gauge reading. For sure the normal (operating) low side AC Low Side Pressure Too High Causes. Those pressures are fine to run the system. Low side pressure at 50-55psi could be low charge, overcharge, bad compressor, weak compressor, low air The pressure on the low side reads 35 PSI while the high side reads 275 PSI! While the AC cools just fine at relatively lower temperatures Jan 13, 2009 · The high pressure side will measure in excess of 250 psi, but that's not important. Compressor turns off then slowly goes back to about 30 psi. Then it goes to ambient temp. Suction Frost Air Conditioner 153. Your ac system should be about 25 to 30 psi for the low side and about 200 to 250 psi on the high side Jul 13, 2012 · Normal for low is about 35psi. High Gauge is based on ambient temp. Low = 40 PSI. If one or both are out of that spec, see the options below to start looking further into your problem. Did lose an This is a common issue and can be fixed. The air at the vent is barely cool. Air Mar 10, 2008 · Start car and check both low and high readings. Location. I can get the interior temp down to about 80 degrees, running the engine at 2,000 RPM. Normally, with the engine running AC on, the low side should be around 27 to 30 psi. With engine is at IDLE, so, ~600 rpm (no revving) Low side: pressure climbes to 70 - 90 PSI Warning: Do not attempt to troubleshoot refrigerant charge on central air conditioning units unless you are EPA 608 type II Certified. Under those conditions, the high side pressure spec is 199 to 228 psi. . If high side pressure is still zero or low Pressure readings with the AC running, max cool, fan on high, again with ambient temp ~100F: WITH engine revved to 1200 - 1500 RPM: Low side: ~40 - 50 PSI. from $25. Charge until the system runs 35-45psi with the compressor running. The pressures do equalize when the engine is off. Is your cabin air filter plugged? Could cause low pressure limit to be reached from evaporator coil getting too cold. 110°F (43°C) 50-55 psi / 345-379 kPa. Same day with hot engine bay. With ambient temperature around 70 degrees the low side pressure is about 30 psi, and the high side pressure is around 150. The high-side pressure If the low-side pressure is at or over 100 and the high-side pressure is 150, then the system is truly out of balance for some reason. ac low side pressure 150 psi

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