Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading
65°F Ambient temperature:
Low side pressure 25-35 psi High side pressure 135-155 psi
70°F Ambient temperature:
Low side pressure 35-40 psi High side pressure 145-160 psi
75°F Ambient temperature:
Low side pressure 35-45 psi High side pressure 150-170 psi
80°F Ambient temperature:
Low side pressure 40-50 psi High side pressure 175-210 psi
85°F Ambient temperature:
Low side pressure 45-55 psi High side pressure 225-250 psi
90°F Ambient temperature:
Low side pressure 45-55 psi High side pressure 250-270 psi
95°F Ambient temperature:
Low side pressure 50.55 psi High side pressure 275.300 psi
100°F Ambient temperature:
Low side pressure 50-55 psi High side pressure 315-325 psi
105°F Ambient temperature:
Low side pressure 50-55 psi High side pressure 330-335 psi
110°F Ambient temperature:
Low side pressure 50.55 psi High side pressure 340.345 psi
Low side / High Side
Low Side 25-40 / High Side 170-250 Normal Pressure affected by ambient temp-
Low-Low Side / Low-High Side,, Under Charged -
Low-Low Side / Low-High Side,, expansion valve Restricted or closed -
Low-Low Side / Low High Side,, Orfice tube Restricted or blocked -
Low-Low Side / Low-High Side,, Suction line at pump Restricted or blocked -
Low-Low Side / Low-High Side,, Condenser Line to Evaporator, Evaporator Restricted - Low-Low Side / High-High Side,, Evaporator Restricted Air Flow -
High-Low Side / Low-High Side,, Compressor weak, High side needle will shake -
High-Low Side / High High Side,, Over Charged
High-Low Side / High High Side,, Splash water onto Condenser-if press drops,, Over Charged -
High-Low Side / High High Side,, Condenser Air Flow Restricted -
High-Low Side / High High Side,, Engine overheating Temp High -
High-Low Side / High High Side,, expansion stuck Open -
High-Low Side / High High Side,, Air, Moister in freon
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