Manifold Gauge Set Connections

CAUTION: Do not use an R-12 manifold gauge set on an R-134a system. The refrigerants are not compatible and A/C system damage will result.

LOW PRESSURE GAUGE HOSE - The low pressure hose (Blue with Black stripe) attaches to the low side service port. This port is located on the A/C liquid line near the accumulator tube tapping block.
HIGH PRESSURE GAUGE HOSE - The high pressure hose (Red with Black stripe) attaches to the high side service port. This port is located on the A/C discharge line near the A/C compressor.
RECOVERY/RECYCLING/EVACUATION/CHARGING HOSE - The center manifold hose (Yellow, or White, with Black stripe) is used to recover, evacuate, and charge the refrigerant system. When the low or high pressure valves on the manifold gauge set are opened, the refrigerant in the system will escape through this hose.