Service Port HVAC: Description and Operation

The refrigerant system has a high-pressure (discharge) and a low-pressure (suction) gauge port valve. These are Schrader-type valves which provide access to both sides (high-pressure and low-pressure) of the system for service hoses and a manifold gauge set so system pressures can be read.

Service Hose Adapter Tools:

A Rotunda High Side Adapter Set D81L-19703-A or Motorcraft Tool YT-354 or 355 or equivalent, is required to connect a manifold gauge set or charging station to the high-pressure gauge port valve.






A Tee-Type Service Adapter Tool D87P-19703-A or equivalent may be used when diagnosing the low-pressure side of the R-12 refrigerant system.