Heating and Air Conditioning: Service and Repair

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

CAUTION: ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM. ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED WORK AREAS.

IMPORTANT: Check to make sure gauges read zero before installing manifold gauge set.




1. Close both hand valves of manifold gauge set.
2. Connect low pressure (blue) gauge hose to suction service port located on the suction pipe muffler at inner right strut housing. Pull valve assembly collar up, place valve assembly over service port and release collar.
3. Open service valve.
4. Connect high pressure (red) gauge hose to discharge service port located on the liquid line forward of air box. Pull valve assembly collar up, place valve assembly over service port and release collar.
5. Open service valve.