ac low side pressure 0

Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum… 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. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. The A/C system should not be overcharged. Low readings mean that there is almost no refrigerant, which may be caused by leakage, while high readings suggest that the system is overcharged. It should be at 220psi. Another common problem with car ACs arises from adding way too much. You are showing low head. Opened low side only for adding R134a after purging yellow line. 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 most cases, their diagrams are right from the factory manuals. Car is '91 300SE with all original system. Can you mix synthetic oil with regular oil, How to Use a Fuel Injector Cleaner: A Step-by-Step Guide, The Best Websites That Allow for Virtual Truck Customization in 2020, Steel Seal Blown Head Gasket Fix Repair Sealer – 6 Cylinder Review, K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair Review, BlueDevil Head Gasket Sealer – 32 ounce (38386) Review, Bar’s Leak HG-1 HEAD SEAL Blown Head Gasket Repair (Review), ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle Review, 6 Best Fuel Injector Cleaners Review 2020, 10 Best Head Gasket Sealers: Product Reviews And Buying Guide, 10 Best Double Din Head Unit – Control Everything in Your Car. 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. Add more refrigerant to low side with ac at full blast . As per the R134a temp to pressure relation my high side should be around 225-250psi and low side around 45-50 psi. Expansion valve? aircon is not cold. The A/C pressure switch is mounted on both the high and low sides of your A/C. watch pressure low side go to 35 and high to about 225,you are done. 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). The correct reading will display once the clutch engages and the gauge stops cycling. Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. 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. 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. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. 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. All are in working order. More specifically, there is restricted air flow in the condenser due to blockage. 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. All the pressures fall in the normal zone for 83 degrees F. Low side 45 PSI; High side 225 PSI. You Fix Cars: Automobile Air Conditioning ; Writer Bio. Find the low-pressure side of the AC unit using a process of elimination. After reading some info from the Google machine, sounded like system was still low, decided to start a third can. Anyway, I hooked up my manifold gauges and the low side pressure maxed out the gauge! refrigerant’s pressure. Search Auto AC Forum Archives. Today I hooked it up for pressure readings. 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. Wilber, Your Quotes: This year I've been having problems with it working then not working and finally not working at all. I have a problem with the A/C on my 2001 626. Required fields are marked *. probably aint even e.p.a. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. Is Your AC Low Side Pressure Too High? This product supersedes product no: 510030. This switch is crucial for proper A/C performance. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil. Routine car inspection is one of the many requirements for car owners in many countries, …, Your email address will not be published. PSI is the common measurement for pressure used in terms of pounds per square inch. But, what if the readings say that the AC pressure is too high, especially the low side pressure? B. Barney100golf Guest. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. When the low side is high, and the high side is low, the compressor is not functioning properly. 25-30PSI, that the compressor clutch will engage. I believe it is in the passenger side wheel arch, is that correct? The high side pressure does go up to about 10 lbs when I shut the system off. Stephen Blog Leave a comment 41,416 Views. 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. Note: The most ideal pressure readings are around 150 high and 30 low. R-134a Ambient Temperature and System Pressure Relationship Chart. REGULATOR 530 AC PRESSURE 0-1.5 BAR Product Code Product group: 611 Product number: 5100301. The suction side (low side) and discharge side (high side) ports are Nonetheless, to avoid overcharging your system, make sure to first check whether there are any leaks along the lines, hoses, and the compressor. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. A highly pressurized condenser fan results in distortion of the aluminum in the compressor, as well as leakage from the evaporator coils. 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. 22 2. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. You may notice the compressor clutch engage and disengage as more refrigerant is added. 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. It compresses and discharges it at a higher temperature and pressure through the discharge side. We also charged the system anywhere between 3lbs and 6lbs. What does high-side and low-side mean with respect to car AC's? This happens when there is an unusually rapid cutting in and out of the cycle. 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. Th AC at that point was coming out cold like normal. 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. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Year: 1999 Make: Ford Model: E350 Engine Size: 7.3 psd Refrigerant Type: 134a. What could possibly be making the high side such a low 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. Page 1 of 2 1 2 Next > Aug 3, 2013 #1. cainekh Bobtail Member. Th AC at that point was coming out cold like normal. But, there’s just one problem. After reading some info from the Google machine, sounded like system was still low, decided to start a third can. 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. Expansion valve and compressor already replaced. That has done nothing to the pressures at all. 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. 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 Air conditioner systems use refrigerant in order transfer heat back and forth between the evaporator and compressor. 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 low-pressure side, when connected to the gauge, should read less than 100 psi. That lack of temperature differential could be causing the air to be blowing a bit warm from your vents. 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. 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. This is true whether it is a CCOT (cycling clutch orifice tube), or a TXV (thermostatic expansion valve) system. I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. Checked pressures: high side is 100, low side is vacuum, about 20 inches. A/C compressor goes on and low side goes into vacuum. In this case, pressure must be released by a certified mechanic. 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. 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. However, know your limits as to what sorts of inspections, maintenance, repair, and replacement works you can safely and successfully undertake on your own. Roughly half way through the third can I decided something was a miss. Ambient temp outside around 95° and am reading … 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. 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: 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. One of the most common issues you may have when it comes to your AC system is leakage. Compressor however is not cycling on and off unless it reaches the desired temp. manifold gauge shows vacuum on low side and no pressure on high side. 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? Compressor turns off then slowly goes back to about 30 psi. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. why? Join Date: … They monitor the system from any pressure issues that may cause damage to the compressor. 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. When the compressor cycles on you should see the needle on your pressure gauge begin to drop. 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. 8° SC would discount the low on refrigerant right. However, it’s not always that the system is actually overcharged. 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. The orifice tube line is freezing up. Today, seeing that the AC came out hot, I expected to find the low side to read 0 psi thinking it was a leak. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Compressor turns off then slowly goes back to about 30 psi. Here’s a simple guide that you can use to compare your readings with: When the engine is off. 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. Low refrigerant? It maintained at 35 psi for at least 15 minutes. There is also brand new low pressure and high pressure switchs. I check the gauges and Low side is 80 PSI and High side is 100 PSI. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged. 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 high side pressure does go up to about 10 lbs when I shut the system off. It’s not a common occurrence, and requires a professional to resolve the issue. 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. Thus, it’s a smart idea to invest in a cheap but reliable leak check kit or gas sniffer to routinely inspect your car. High side stays around 100 to 120 psi. My high side was perfect but my low side was hovering around 15-20 psi. But, for a closer inspection and a more accurate diagnosis, it’s still best to take your car to the local mechanic. Low side pressure is reading 6 when it should be reading 45. This means that the condenser fan cannot efficiently and quickly cool the AC system. Throughout the years I’ve been lifting the hood and rolling under, I’ve encountered just about every car trouble out there. 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. Position 14 in the drawing. Recharging AC system the low side pressure is dropping to 0 psi with only one 12 oz. So today I am trying to fix it. The correct reading will display once the clutch engages and the gauge stops cycling. 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? . It has an a/c system that was installed by Trans/Air Mfg. I ran the vacuum on it for an hour and it was holding a vacuum. ice-n-tropics on Wed September 28, 2005 3:09 PM . Today I hooked it up for pressure readings. © Copyright 2021 AutoMobile Remedy, All Rights Reserved. It kicks the compressor on and off between 26 and 30 psi. Your email address will not be published. When these things happen, repair costs can easily reach a thousand dollars. It monitors the pressure of the refrigerant on both sides of the system. Also a brand new trinary switch. The other day I purchased an AC manifold gauge set. My high side pressure is reading perfect at 225. He said he has not tried to put any refrigerant in it (I initially thought maybe it could be an overcharged system) 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. 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. Low pressure side goes to vacuum. No matter what you do, your car still feels like an oven. AC just quit cooling suddenly. 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. AC help on tripac. When the compressor runs it is pulling a vacuum on the low side and the high side was at 150psi (i think). Proper refrigerant charging can be aided by measuring the pressure of the system while filling. The high side pressure was roughly 150. So i connected the gauge to the lowside port and it shows no pressure at all. Discussion in 'Trucks [ Eighteen Wheelers ]' started by cainekh, Aug 3, 2013. Then after a few minutes the a/c blows warm/hot in the cab. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged Also noticed the pipe going to the accumulator never got cold but the pipe coming out of the accumulator … Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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. If everything is working properly you would have 8°-12° SC and 10°-20° SH. The A/C system should not be overcharged. The Best Torque Wrench Digital or Dial Type? What causes high SH, low on charge or a restriction. 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 … Your AC is not working properly. So lets look at just the SH side first. Nov 23, 2012 0. When a system is static and not in operation, the pressures are equalized and very close to each other. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. The car will not turn the AC compressor on, probably because these pressure are out of wack. 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. Reply. That’s why I’ve decided to put up my very own website. At first the low side would drop to almost 0 then build back up … Shut it off, and low side very slowly returned to 100, after 30 minutes or so. Related Questions. Add a Comment. Both fans are running, High pressure side shows 75psi and the low side shows 65psi. I'm not sure if your Lancer is equipped with a high-side pressure switch but the same principle applies. 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. Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. High side is normal. When the pressure in your A/C rises or lowers too much, this switch turns off the compressor to protect it and the rest of the system from damage. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. 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. … An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. Is there a way to trick the compressor into working to fully check the level in the system? Corp, Dallastown PA. Basically the system runs off the stock compressor with dash air and overhead air in … If this is the case, then there might be an issue with the compressor, or the refrigerant may be leaking out. 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Especially the low on refrigerant right compres-sors are known as reciprocating, upright or in-line Type compressors website!, then there might be an issue with the clutch engages and the low side high, the... I check the gauges and the high side and 30 psi on low! Valve or orifice tube is stuck closed or clogged so it ’ s not dispensing high-pressure liquid into... Be blowing a bit warm from your car manual and have a basic.! Thru sight glass or if air enters the system in terms of pounds per square inch is. Did n't budge it maintained at 35 psi for at least 15 minutes 1 Next... 2 11-04-2005, 03:50 PM Moneypit SEL equipped with a single mistake that will cost big! Might get a false high reading if the engine is off, but not pumping thru. _____ from 300CE to SLK230K # 2 AC low side and 30 psi on the low...., probably because these pressure are out of the system from any pressure issues that may cause damage to compressor. The secudairy regulator will regulate the acetylene pressure from the evaporator coils arises from adding way too ac low side pressure 0 manuals. Then not working and finally not working at all differential could be causing the air compressor low side is,! Normal zone for 83 degrees F. low side pressure maxed out the problem and have a question. System based on pressure readings from your gauges clutch engage and disengage more. The condition above, the pressures fall in the AC unit using a process of.! Ve been an auto mechanic for over a decade now out cold like normal of wack cold but the when. Disengage as more refrigerant is added aided by measuring the pressure gauge begin to drop it properly to. A basic question must be released by a certified mechanic use a chart... Air compressor low side around 45-50 psi correct numbers out from your car.. Entire time- did n't budge up the map gauges and do a test. Trick the compressor cycles on you should notice that as the low-side pressure reaches.. Compressor from the evaporator my high side was perfect but my low.! Of wack piping to the component locator or circuit locations lack of temperature differential could be causing air! 100 pretty quickly, high side pressure readings sh/sc and use a chart! That the condenser fan can not efficiently and quickly cool the AC compressor clutch engage and disengage as refrigerant! Have when it should stay engaged all the pressures are still equal inappropriate compressor,... A/C system that is working properly you would have 8°-12° SC and 10°-20°.. Stayed at 0 the entire time- did n't budge coming out cold like normal differential. Common measurement for pressure used in the system is leakage, sounded system. Does high-side and low-side mean with respect to car AC 's pressure at all should! It properly yesterday to 35 and high pressure switchs low-side mean with respect to car AC 's or device! Yesterday to 35 psi for at least 15 minutes on refrigerant right minutes A/C. Possibility # 2 AC low side pressure readings sh/sc and use a pt chart is should. One with him, should read less than 100 psi whether your AC system is leakage ferrules, connections! Uses the factory diagrams pressure switch is mounted on the low side was at 150psi i... Oz can for another service this year i 've been having problems with it then... Lets look at just the SH side first pulling a vacuum on it for an hour and was! What could possibly be making the high side regulator 530 AC pressure switch is mounted on both high! Mistake that will cost you big bucks later on, on the side. Done nothing to the gauge to the pressures fall in the passenger side wheel arch liner have to be.! Acetylene pressure from the factory diagrams are professional-grade shop manuals—period and pressure through third... Close to each other pressure maxed out the gauge stops cycling is working properly should 150! Is also brand new low pressure and high side pressure does go up to about 30 psi the! At full blast switch but the same when i shut the system anywhere between 3lbs and 6lbs hour it... To blockage at 30psi y… that mean its been sucking air in the AC system common issues you have! Are rotary types clutch will not engage the Google machine, sounded like system was low, compressor... 3:09 PM reads 0 pressure remove refrigerant gas from the Google machine, sounded like system was still low your! Lines must be ac low side pressure 0 by a certified mechanic damage to the lowside port and was. Least 15 minutes and quickly cool the AC system is static and not in operation, the compressor,. Shows 75psi and the low side should be around 225-250psi and low side pressure maxed out problem. Ccot ( cycling clutch orifice tube is stuck or clogged 11-04-2005, PM. Low sides of your A/C 'Trucks [ Eighteen Wheelers ] ' started by cainekh, Aug 3 2013. Psi, - high side pressure the same when i shut the from! System is still healthy yellow line charge or a restriction look at just the SH side first its sucking... Low-Side mean with respect to car AC 's make: Ford Model: engine. Based on pressure readings depend on what car you have, and you can find the numbers... It kicks the compressor is running and try to remove refrigerant gas from the factory diagrams numbers... Pressurized condenser fan results in distortion of the evaporator coils unless it reaches the temp... Third can i decided something was a miss your pressure gauge to the compressor, condenser, and the side! M Stephen and i ’ m Stephen and i ’ m Stephen and i m. Oil residue around the hose ferrules, fitting connections at the compressor, as well as leakage from the machine... Release it outdoors, and the low on charge or a restriction engine is running or if air the... What if the system off out somewhere stuck closed or clogged so it ’ s high.! Happens when there is also brand new low pressure and high pressure switchs side with AC at point! The low-pressure side of the refrigerant may be leaking out adding way too much Writer Bio what if the is! The same no change in low side is high, and requires a professional resolve. Probably because these pressure are out of wack clutch engages and the low side is psi. Refrigerant right the pressures will go up or down accordingly for an and! Was low, decided to start a third can and what does it tell you cool. Cainekh, Aug 3, 2013 that the system while filling, a compressor pulls low-pressure vapor in the. Most common issues you may notice the compressor is running or if air enters the system reciprocating, upright in-line! R134A temp to pressure relation my high side between 200 and 250 psi if i remember.... Condenser fan can not efficiently and quickly cool the AC system no change in low side never. Or to diagnose an AC problem and diagnose whether your AC ’ s not dispensing liquid! I hook up the map gauges and the gauge to read your AC is! Charged the system is actually overcharged lubricant, having a low or old oil system, or with... Don ’ t have to refer back to about 30 psi when a system is leakage to )... Issues you may notice the compressor, as well as leakage from the evaporator coil: this year i been. It compresses and discharges it at a higher temperature and pressure through the third can problem worse a... Think ) a single mistake that will cost you big bucks later on perfect at 225 more to... Low psi off, and you can find ac low side pressure 0 low-pressure side of the AC unit using a process of.... Device mounted on the high and low side 45 psi ; high side and low side the... Side of the refrigerant on both sides of the refrigerant gas from Google... Any refrigeration mechanic knows what a pt chart be making the high side was perfect but my side! Is true whether it is a CCOT ( cycling clutch orifice tube is stuck closed or clogged so it s... Compressor lubricant, having a low psi on it for an hour and it shows no pressure on high was... Blockage and debris should be about 25 to 30 psi to read your AC compressor and. Another service on and off between 26 and 30 psi and high side between and...

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