F 350 2WD Pickup V8-460 7.5L VIN G EFI (1997)
Service Port HVAC: Description and Operation
NOTE: The A/C service port fittings used in R-134a refrigerant systems are a two-piece design. The top portion of the fitting is aluminum and is
threaded to the bottom part and sealed with an O-ring seal. These fittings can be serviced through the use of either the High Side A/C Fitting Socket
D94L-19703-A or the Low Side A/C Fitting Socket D94L-19703-B providing the system is first discharged. The valve seal is an integral part of the
aluminum fitting piece which must be replaced if the seal leaks. The Schrader valve core used on R-12 systems is not used in the R-134a system.
High Side Service Port
The high-side fitting is the largest and special adapters are required to attach service equipment to both the high- and low-side system ports.
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Rotunda R-134a High-Side Quick Disconnect 176-R0037 or equivalent.
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Rotunda R-134a Low-Side Quick Disconnect 176-R0036 or equivalent.
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Rotunda R-134a Manifold Gauge Set 176-R032A or equivalent.
Always reinstall the A/C charging valve caps on the service access gauge port valves after servicing the A/C system to prevent dirt from entering the
valve or refrigerant system.
