1. Momentarily energize the pilot solenoid to shift the 3 way valve.
NOTE: On late 1989 and newer units the pilot solenoid must remain energized for the remainder of the test. Failure to keep the pilot solenoid energized will prevent a positive test of the condenser pressure bypass check valve.
2. Immediately observe the gauge manifold gauges. Manifold gauge pressures should equalize.
3. A rise in manifold gauge pressures after they equalize indicates the 3-way valve is leaking to the condenser side. The 3-way valve spool, piston seal, or condenser pressure bypass check valve need service.
Testing the Condenser Pressure Bypass Check Valve
1. Back seat the condenser pressure bypass check valve.
2. Manifold gauge pressures should rise if the condenser pressure bypass check valve is working properly.
CAUTION: On newer units, the pilot solenoid must be energized to keep the 3-way valve in the heat position for this test.
