A/C Info

A/C

Ambient Temperature (normal readings)

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

A/C Reading Pressures (diagnosing)

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