Using Manifold Gauge Set

This procedure enables the technician to discover and repair cooling problems by having the pressure of both the high and low pressure sides indicated on the respective gauges of the manifold gauge set.

ATTACHING MANIFOLD GAUGE SET
1. Make sure that high pressure and low pressure valves of manifold gauge are firmly closed.
2. Connect high pressure charging hose to high pressure service valve on vehicle, and connect low pressure charging hose to low pressure service valve on vehicle.
3. Bleed the air in charging hoses by loosening their respective nuts on manifold gauge, utilizing the refrigerant pressure. When a hiss is heard, immediately tighten nut.

CAUTION:
Do not interchange high and low pressure charging hoses by mistake.
If the compressor is equipped with service valves with different thread diameters, the smaller is the high pressure side, and the larger the low pressure side.