Camry Sedan L4-2.0L (3S-FE) (1987)
Expansion Valve: Testing and Inspection
1.
Connect manifold gauge set.
2.
Run engine at fast idle and check low pressure gauge reading.
a. Gauge readings below 7 psi may be caused by moisture freezing in the expansion valve orifice, a clogged valve, or by gas leakage from
capillary tube or bulb. Check or replace expansion valve or receiver/drier.
b. Gauge readings above 70 psi may be caused by excessive opening of expansion valve orifice due to a loose remote bulb holder or a defective
expansion valve. Retighten or replace bulb holder or replace expansion valve.