The air coming out of my main vents and rear vents is not as cold a it use to be. I am hearing what I believe the be the rear txv hissing as the compressor cycles on and off. I just got a set of manifold gauges from O'Riley's loaner tool program, here are my readings. Ambient - 70° Static system pressure - 84psi equalized High side when compressor kicks on - 125psi Low side when compressor kicks on - 30psi High side when compressor is cycled off - 100psi Low side when compressor is cycled off - 50psi What is going on? Are those numbers within an acceptable range? Should I try adding refrigerant? I am considering pulling all the refrigerant out, vacuuming, and replacing the correct amount just to see what happens.