2. Remove the plug from the A/C line service valves.
3. Install the gauge block.
A) Close both gauge block valves.
b) Connect gauge block hoses to service valves.
V) Open both gauge block valves.
G) Press the valve core located on the side of the gauge block and release the refrigerant from the air conditioning system.
Note: below are drawings with diagrams for installing the pressure gauge block on vehicles with various engines and the points of connection of the hoses of the pressure gauge block to service valves.
