Installed

1. Connect manifold gauge set to compressor.
1. Run engine at fast idle and check low pressure gauge reading.
a. Pressure gauge readings below 70 psi are caused by moisture freezing in the expansion valve orifice or by gas leakage from capillary tube or bulb. Check or replace expansion valve or receiver/drier.
b. Pressure gauge readings above 70 psi are caused by excessive opening of the expansion valve orifice, which is due to a loose remote bulb holder or a defective expansion valve. Retighten or replace bulb holder or replace expansion valve.