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Four Seasons 20987 HVAC Binary Switch
Four Seasons 20987 Pressure Switch Overview
The Four Seasons 20987 pressure switch is a system-mounted HVAC binary switch built for pressure-based compressor control. It uses a round female connector, a 3/8 in. x 24 female fitting thread, and a 2-terminal weather-pack design for a secure electrical connection in the A/C system.
Compatible with 1989-1992 Nissan Maxima pressure switch applications, this Four Seasons Pressure Switch line part is built to meet or exceed OEM requirements and is identified by part number 20987.
Key Features
- Binary HVAC pressure switch for system-mounted applications
- Round female connector with gray housing
- 2-terminal, weather-pack style electrical connection
- Female fitting with 3/8 in. x 24 thread size
- Steel construction for durability in HVAC service
- Operates at 33 psi low off and 34 psi low on
- Meets or exceeds OEM specifications
Product Details
Four Seasons 20987 is a pressure-operated HVAC binary switch used to monitor refrigerant system pressure and signal compressor control. The switch is system mounted and uses an open comp configuration, helping the A/C circuit respond to pressure conditions in a controlled way. For buyers searching for a Nissan Maxima pressure switch, this part number 20987 provides a direct replacement option for 1989, 1990, 1991, and 1992 models listed in the fitment data.
This part cross-references AP Exhaust 50002 for the same application.
Common Issues This Part May Address
- A/C compressor cycling caused by incorrect system pressure signal
- Compressor shutdown related to pressure switch failure
- Intermittent HVAC operation from worn electrical contacts
- Fault codes or control issues tied to pressure switch input
- Loss of compressor engagement in a Nissan Maxima HVAC system
Installation Notes and Tips
Verify the connector shape, terminal count, and 3/8 in. x 24 female thread before installation. Confirm the replacement switch matches the vehicle’s system-mounted pressure switch location and pressure operating points. Always inspect the HVAC connector and sealing surfaces for corrosion or damage during service.
Quality Assurance
Four Seasons identifies this pressure switch as meeting or exceeding OEM requirements, making it a direct-fit replacement choice for pressure-switch service on supported Nissan Maxima applications.
| Brand | Four Seasons |
|---|---|
| Part Number | 20987 |
| Position | Pressure Switch |
| Color | Gray |
| Comp Open/Closed | Open |
| Connector Gender | Female |
| Connector Shape | Round |
| Description | Switch-Pressure /System Mount |
| Fitting Gender | Female |
| Fitting Thread Size | 3/8 in. x 24 |
| Item Included A Desc | 24606 |
| Item Included A Qty. | 1 |
| Material | Steel |
| Meets / Exceeds OEM? | YES |
| Mnt Sys Loc | System Mounted |
| Number of Terminals | 2 |
| Operate Psi Low Off | 33 |
| Operate Psi Low On | 34 |
| Style | Binary |
| Type | Pressure |
| Weather Pack? | Yes |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1992 | Nissan | Maxima | N/A | Pressure Switch |
| 1991 | Nissan | Maxima | N/A | Pressure Switch |
| 1990 | Nissan | Maxima | N/A | Pressure Switch |
| 1989 | Nissan | Maxima | N/A | Pressure Switch |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.