Your A/C System Low
If your system is still putting out some cold air and the compressor is still engaged it could be low on refrigerant, but there are still other possibilities. Most new A/C systems will produce some cool air with a 70% or better charge and a fully charged properly working system will blow air that is 40-45 degrees Fahrenheit cooler than the outside air temperature. The only way to accurately determine the amount of refrigerant in an A/C system is to use a set of A/C gauges.
The specifications vary from system to system but a properly working system has a low side pressure between 20 to 35 psi and a high side pressure of 200 to 300 psi with an outside air temp of 80 degrees Fahrenheit. The best way to find leaks in an A/C system is with the aid of an ultra-violet dye and a black light. New car A/C systems and older A/C retrofit systems generally use R134a refrigerant and a PAG oil to lubricate the system. PAG oils evaporate without leaving much residue behind like the mineral oils in older A/C systems, making A/C leaks harder to find. (Looking for oil stains on A/C parts.) Variable displacement compressors, multi-speed electric cooling fans, condenser designs, climate control designs, sensors and computer controls all make proper diagnosis critical before adding refrigerant.( And sometimes very tricky.)
Without proper knowledge a person could cause a-lot of very costly damage to the A/C system, (I've seem people cause $80.00-$1000.00 yes $1000.00 in additional damage.), or cause injury or possibly death to themselves. (Overcharged A/C systems can exceed pressures of 450 psi, you don't want to be around it when something explodes.) For these reasons you should always have your A/C system checked by a certified A/C technician. Have any Questions Contact Us