![]() If you are experiencing a problem with how your AC works, but you also have these normal ranges of low pressures on the low side and high pressures on the high side then it means you have a problem somewhere else in the system. If both of your numbers are in these ranges, then everything is working the way it should be and you shouldn't have too much to worry about in terms of your AC system. 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. That's about average for the low pressure and will only change a little bit based on the ambient temperature around your engine compartment. When you hook up the gauge to your AC system to measure what the pressures are, on the low side the gauge should be giving you a reading somewhere between 25 pounds per square inch and 30 pounds per square inch. What Should the Pressure of your AC System Be?Īs we've established, there are two different sides to your AC system that have two different pressures. 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. 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 coolant. From that point all you need to do is compare it to the ambient temperature and the pressure is listed on the number chart for your particular air conditioning unit. Some of them can be quite a bit more expensive, but if all you're doing is simply checking the pressure that should get the job done for you at a fairly reasonable price. You can buy an AC pressure gauge on Amazon for about $30 or so if you want to do this yourself. You just need to hook up a gauge set to the AC system and record the pressures on the low side and the high side. In other words, the compressor is sucking, but there’s nothing to suck.Determining the pressure in your AC system is not entirely difficult to do. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged 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. 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 because the system is undercharged ![]() Repair Topics > Air Conditioning Symptoms and Repair > Gauges and Gauge Pressures > AC low side pressure is too Low AC low side pressure is too Low AC low side pressure is too Low - What it means when AC low side pressure is too Low
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