Operational Test

Before beginning test, install air conditioning gauge set, apply parking brake, and operate engine at 1500 RPM in "NEUTRAL". Set A/C control on "MAX" with blower on "LO".

1. Check evaporator pressure. If it is 30 psi or less, and outlet air temperature is too warm, replace expansion valve capsule.
2. If evaporator pressure is above 30 psi, even with blower motor wire disconnected, replace the POA valve.
3. If evaporator pressure is 29 psi (±1), and outlet air temperature is normal, partially cover the condenser to obtain a head pressure of 300 psi. If evaporator pressure rises above 30 psi, replace the expansion valve. If evaporator pressure remains at 29 psi, there is a possibility of moisture in the system, and a new desiccant bag may be indicated.