Dual-Function Pressure Switch
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Dual-function pressure switch electrical connector (part of 14290) |
| 2 | 19D594 | Dual-function pressure switch |
| 3 | 19D701 | Dual-function pressure switch Schrader-type valve |
| 4 | 19E889 | O-ring seal |
The dual-function pressure switch is located on the receiver drier and includes 2 separate sets of contacts that are opened at 2 different pressures.
The first set of contacts in the dual-function pressure switch is used to interrupt A/C compressor operation in the event of excessively high discharge pressure in the high-pressure side of the refrigerant system. The PCM monitors the first set of contacts in the dual-function pressure switch in-series with the low-charge protection switch. When the contacts are open, the PCM will disengage the A/C compressor clutch.
The second set of contacts in the dual-function pressure switch is used by the PCM to engage the high-speed cooling fan. The PCM monitors the second set of contacts through the A/C pressure (ACP) circuit. When the A/C pressure rises above a preset level, the second set of contacts will close and the high-speed cooling fan will be engaged.
The dual-function pressure switch is installed on a Schrader-type valve core fitting on the receiver/drier. It is not necessary to recover the refrigerant to remove the dual-function pressure switch.