Pressure Cutoff Switch: Notes

The pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressure.

• The pressure cutoff switch is mounted on a Schrader valve-type fitting on the high pressure side.
• A valve depressor, located inside the threaded end of the pressure cutoff switch, presses on the Schrader valve stem
• This allows the pressure cutoff switch to monitor the compressor discharge pressure.
• When the A/C compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor. For additional information regarding operating pressure (s), refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION .
• It is not necessary to discharge the refrigerant system to remove the pressure cutoff switch.
  Fig 1: Identifying Spring Lock Coupling

  Courtesy of FORD MOTOR CO.

The spring lock coupling is a refrigerant line coupling held together by a garter spring inside a circular cage.

• When the coupling is connected together, the flared end of the female fitting slips behind the garter spring inside the cage of the male fitting.
• The garter spring and cage then prevent the flared end of the female fitting from pulling out of the cage.
• Three O-ring seals are used to seal between the two halves of the condenser core couplings, all other couplings have two O-ring seals.
• Use only the O-ring seals listed in the Ford Master Parts Catalog for the spring lock coupling.
• A plastic indicator ring is used on the spring lock coupling of the evaporator core to indicate, during vehicle assembly that the coupling is connected. Once the coupling is connected the indicator ring is no longer necessary but will remain captive by the coupling near the cage opening.
• The indicator ring may also be used during service operations to indicate connection of the coupling.
• An A/C tube lock coupling clip (19E746) may be used to secure the coupling but is not required.