Checking of A/C System For Pressure Leaks

After completing the evacuation, close manifold gauge high pressure valve (Hi) and low-pressure valve (Lo) and wait 10 minutes. Verify that low-pressure gauge reading has not changed.

CAUTION: If the gauge reading moves closer to "0", there is a leak somewhere. Inspect the tubing connections, make necessary corrections, and evacuate system once again, making sure that there are no leaks.