What does the refrigerant containment switch do?

It operates the high-speed electrodrive fan from 1000 RPM with refrigerant pressure below 150 psi to 1800 RPM with refrigerant pressure over 250 psi. It connects through connector C1069 on circuits 441 (R/Y) and 198 (DG/O).

What wire color feeds the A/C clutch circuit from the pressure switch to the PCM and relay module?

Circuit 883, colored PK/LB (pink/light blue), runs through connector C191, splice S147, and C116 (3.0L only) to the Powertrain Control Module and Constant Control Relay Module.

How is the A/C clutch field coil grounded?

The clutch field coil grounds through connector C161 on circuit 57 (BK), and the diagram also shows circuit 60 (BK/LG) through C116 (3.0L only) to splice S114, then 57 BK to ground G101 (see Grounds page 10-1).

Which engines does this diagram cover?

It is marked 'SHO ONLY' and shows separate branches for the 3.2L and 3.0L engines, with feeds from C122 (3.2L) or C100 (3.0L) referenced from page 55-2.

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Ford Taurus SHO A/C Clutch & Cycling Pressure Switch Wiring Diagram (EVTM)

Ford SHO A/C clutch and refrigerant containment circuit wiring diagram, EVTM screen capture

EVTM wiring diagram (SHO only) for A/C clutch cycling pressure switch and refrigerant containment switch through the constant control relay and PCM; switch opens at 25 psi, closes at 45 psi.

AI caption June 2012 · Photo 1 of 1

This document is a screenshot from Ford's Technical Service Publications EVTM (Electrical and Vacuum Troubleshooting Manual) software showing the A/C clutch control wiring diagram labeled 'SHO ONLY' for Ford Taurus SHO models with 3.0L and 3.2L engines. The diagram traces power from connector C122 (3.2L) or C100 (3.0L) on circuit 348 (P) through the A/C Clutch Cycling Pressure Switch, which closes at 45 psi increasing and opens at 25 psi decreasing, cutting power to the A/C clutch field coil at low suction pressure. Circuit 883 (PK/LB) runs to the Powertrain Control Module (pages 23-7, 24-3) and Constant Control Relay Module (pages 23-7, 24-6), which contains solid-state A/C clutch feed (+/-), A/C relay control feed, and HFC outputs. The Refrigerant Containment Switch (connector C1069, circuits 441 R/Y and 198 DG/O) operates the high-speed electrodrive fan from 1000 RPM below 150 psi to 1800 RPM above 250 psi. Grounds route on circuits 57 BK and 60 BK/LG through splice S114 to G101 (grounds page 10-1). Connectors shown include C1019, C127, C125, C161, C191, C160, C116, and C1069. Wire colors and circuit numbers are given for every segment, making this useful for diagnosing SHO A/C compressor clutch and cooling fan issues.

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Frequently asked questions

At what pressures does the A/C clutch cycling pressure switch operate on the Taurus SHO?: Per the diagram, the A/C Clutch Cycling Pressure Switch closes at 45 psi increasing and opens at 25 psi decreasing, cutting off power to the A/C clutch field coil when there is low suction pressure.
What does the refrigerant containment switch do?: It operates the high-speed electrodrive fan from 1000 RPM with refrigerant pressure below 150 psi to 1800 RPM with refrigerant pressure over 250 psi. It connects through connector C1069 on circuits 441 (R/Y) and 198 (DG/O).
What wire color feeds the A/C clutch circuit from the pressure switch to the PCM and relay module?: Circuit 883, colored PK/LB (pink/light blue), runs through connector C191, splice S147, and C116 (3.0L only) to the Powertrain Control Module and Constant Control Relay Module.
How is the A/C clutch field coil grounded?: The clutch field coil grounds through connector C161 on circuit 57 (BK), and the diagram also shows circuit 60 (BK/LG) through C116 (3.0L only) to splice S114, then 57 BK to ground G101 (see Grounds page 10-1).
Which engines does this diagram cover?: It is marked 'SHO ONLY' and shows separate branches for the 3.2L and 3.0L engines, with feeds from C122 (3.2L) or C100 (3.0L) referenced from page 55-2.