Pickup 4WD L4-2366cc 2.4L SOHC (22R) (1984)
Expansion Valve: Testing and Inspection
Installed
1.
Connect manifold gauge set to compressor.
2.
Run engine at fast idle and check low pressure gauge reading.
a. Pressure gauge readings below 7 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.