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Installing Manifold Gage Set

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Manifold Gage Set
GM861128Courtesy of GENERAL MOTORS CORP.

If an A/C system problem still exists after you have completed the preliminary inspects, more diagnostic tests must follow. These include manifold gage set readings. Follow the steps listed below for installing a manifold gage set.

    CAUTION: Always wear goggles and wrap a clean cloth around fittings, valves, and connections when performing work that involves opening the refrigerant system.
    IMPORTANT: Inspect to make sure gages read zero before installing manifold gage set.
  1. Close both hand valves of manifold gage set.
  2. Connect low pressure (blue) gage hose to suction service port located on the suction pipe. Pull valve assembly collar up, place valve assembly over service port and release collar.
  3. Open service valve.
  4. Connect high pressure (red) gage hose to discharge service port located on the liquid line. Pull valve assembly collar up, place valve assembly over service port and release collar.
  5. Open service valve.
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