How can you tell when a system is low on refrigerant? If you have too much water in your system, and the receiver / drier is overloaded then it will not be able to continue doing what it's supposed to do. If you use your gauge and determine that your low side is up over 100 and your high side is down around 150 then odds are a mechanic is going to tell you that the problem you're dealing with is your compressor has failed. This could be normal if outdoor temps are very low. Your expansion valve is located at the evaporator and regulates the flow of refrigerant through the AC system as a whole. Note: The most ideal pressure readings are around 150 high and 30 low. Install an in-line filter to prevent re-occurrence. Check condenser fan operation. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. If you are low on refrigerant, it leaked out somewhere. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. Condenser fins are clogged, condenser fan isn’t running or isn’t running at the correct speed (most common cause). You can buy an AC pressure gauge on Amazon for about $30 or so if you want to do this yourself. Compressor turns off then slowly goes back to about 30 psi. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. If you're finding that the low side pressure is higher than it should be while the high side pressure is about normal, then you're probably having an issue with your condenser. I'm guessing there is a restrict somewhere. The pressure is going to need to be released somehow, and it's best to leave that to a mechanic to get the job done safely and properly. 2) Low refrigerant charge (most common cause). It's possible that you might have a problem with your. 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 If the condenser fan is under too high pressure it can warp the aluminum and cause leaking from the evaporator coil. If it's not the compressor that's causing trouble for your AC pressure, it may be your pressure switch. A common mistake that many amateur mechanics would make is putting too much refrigerant into the system without removing their systems first. 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. He said he has not tried to put any refrigerant in it (I initially thought maybe it could be an overcharged system) AC symptom #3: Low side pressure is too high, High side pressure is high Here are the possibilities 1. The point of the switch is to turn off the compressor to prevent damage if the pressure is too far out of line for the system. 2. Replace clogged orifice tube and flush hoses. That's about average for the low pressure and will only change a little bit based on the ambient temperature around your engine compartment. The compressor is the part of your air conditioning system that actually creates the pressure that the coolant is under in your vehicle. (very common especially if you’ve tried to add refrigerant yourself). Items to note:-it does cool OK, but given that it's only low 80s now, I can tell it should do more Car AC Pressure Too High – The Causes And Solutions. The high-side pressure, which the FSM gives only somewhat roughly as higher than 2xx psi (my GM manuals have pressure tables based on humidity and ambient temp, it changes a lot), never goes above about 150 psi at 1500 rpm as specified. system and is raising the pressure as well. Yo… That's the result of either too much refrigerant being put into the system or too much oil. If the pressure is too high than what the chart indicates is normal then that means you have an overcharged system and if it’s lower it means that you might have a refrigerant leak somewhere in the line If you have zero pressure then it means you have no coolant at all and it's likely leaking entirely from someplace. High side stays around 100 to 120 psi. One of the problems that can pop up with your air conditioning is when the pressure on the low side of the compressor is running high, while the pressure at the high side of the, Determining the pressure in your AC system is not entirely difficult to do. If the condenser runs through this cycle more quickly than it's supposed to then the pressure on the low side is going to increase more than is normal. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. Check blend door operation by turning the temperature dial on your car’s HVAC and watching blend door operation. Your best bet if you know that the pressure is off in your air conditioner is to get it to a mechanic so they can narrow down the exact cause of the problem and get it fixed for you safely and quickly. Low side pressure at 50-55psi could be low charge, overcharge, bad compressor, weak compressor, low air flow over condenser, stuck open expansion valve, or many other things. 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. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. If the pressure is high when it's running, then that might just be normal operating procedure. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. Almost sounds like your thermal expansion valve is not opening completely. The refrigeration side of your air conditioner needs to be at the correct pressure in order to produce the temperature required to cool down the vehicle. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Although there are a number of reasons that can make your low side pressure go too high, and the high side pressure go too low, when it comes to both of them happening at the same time you have some limited options. The expansion valve failing is another thing that can cause the pressure on the low side to go too high and the high side to go too low. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. One of the problems that can pop up with your air conditioning is when the pressure on the low side of the compressor is running high, while the pressure at the high side of the compressor is running low. why? And for a lot of drivers this is something they may let slide for a while since air conditioning is not required for the proper functioning of a vehicle. 5. Then, since no more refrigerant is flowing, the evaporator warms up, the ice melts and you get warm air. Possibility #3 AC low side pressure is too high because the condenser has reduced airflow. Traction Control Switch Replacement Cost – This Quick Fix Is Less Than $100! Obviously, this would be a clear place to look if there's a pressure issue in your AC system. For instance, on a 90-degree Fahrenheit day, … The pressure switch is mounted on both the high and low sides of your air conditioning system and it monitors the pressure of the refrigerant as it travels through. If the pressure on the high side and the low side match what is recorded for the ambient temperature around your air conditioner then you don't have a problem with the pressure of your. This could be the result of a problem with your thermostat switch or temperature gauge but you're going to need a mechanic to diagnose this one properly for you. Since the job of the desiccant in the receiver / dryer is to absorb moisture it's possible that it can actually absorb its fill and then no longer be able to do the job it's intended to do. You’ll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. This will reduce the airflow through the condenser and that in turn means it's not going to be able to cool down the AC system. The reason you have a high pressure side and a low pressure side at all is because the compressor increases the pressure and as it runs through your AC system to the condenser where it changes from a gas to a liquid and it will eventually lose pressure again as the cooling process takes place. or so if you want to do this yourself. Evacuate the system and recharge with the correct amount of refrigerant. Once you know that your pressure is off and that's the reason your air conditioning is not working the way it's supposed to, then you should hopefully be able to troubleshoot one of the causes that we've gone through which led to this pressure imbalance in the first place. That in turn can lead to problems with your AC compressor, the expansion valve, and of course the issue with your low side pressure being too high, and your high side pressure being too low. If you have too much, going through the system it could end up freezing and if there's too little then the evaporator may overheat and cause damage. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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 Clogged condenser fins or an inoperative condenser fan can cause low side pressure to be too high. This happens when there is an unusually rapid cutting in and out of the cycle. And for a lot of drivers this is something they may let slide for a while since air conditioning is not required for the proper functioning of a vehicle. Engine Problems with Honda CRV: Customers Had To Pay Up To $3700 On Repairs! 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