Four Seasons 20986 HVAC Binary Switch

Four Seasons 20986 Pressure Switch

The Four Seasons 20986 HVAC binary pressure switch is a system-mounted replacement built for pressure-based A/C control. It uses a rectangular female connector, a 2-terminal layout, and a steel body with a male 3/8 in. x 24 fitting thread size for direct service replacement on supported Nissan applications.

Four Seasons Pressure Switch components are built for HVAC service where accurate pressure signaling matters. This Four Seasons 20986 switch meets or exceeds OEM requirements and is specified as an open, binary pressure switch for system-mounted installation.

Key Features

• Brand: Four Seasons Pressure Switch
• Part number: 20986
• HVAC binary pressure switch, system mounted
• Rectangular female connector with 2 terminals
• Steel construction with gray housing
• Male fitting, 3/8 in. x 24 thread size
• Open contact style with low-off at 34 psi and low-on at 35 psi
• Meets or exceeds OEM requirements

Detailed Description

This Four Seasons 20986 HVAC binary switch is used in A/C pressure control circuits to monitor system pressure and signal the HVAC control strategy. It is a direct-fit style pressure switch for Nissan D21 and Nissan Pathfinder applications listed below, including 1987-1992 Nissan Pathfinder, 1988-1991 Nissan D21, and 1992 Nissan D21 to 1/92. If you are replacing a failed Nissan D21 pressure switch or a Pathfinder HVAC pressure switch, this part number 20986 provides the specified connector, thread, and operating pressure range for the application.

This part cross-references UAC SW10041C for the same application.

What It Helps Resolve

• A/C compressor cycling caused by incorrect pressure switch signaling
• HVAC system shutdown related to pressure circuit faults
• Intermittent compressor engagement on Nissan D21 and Pathfinder models
• Pressure switch replacement needs during A/C service
• Connector or thread mismatch when replacing the original switch

Installation Notes and Tips

• Verify the connector shape, terminal count, and 3/8 in. x 24 fitting before installation.
• Confirm the vehicle application by year and model: Fits 1987-1992 Nissan Pathfinder, N/A; Fits 1988-1991 Nissan D21, N/A; Fits 1992 Nissan D21, N/A, to 1/92.
• Inspect the HVAC system for pressure-related faults before replacing the switch.
• Use proper A/C service procedures when removing or installing a system-mounted pressure switch.

Quality Assurance

Four Seasons 20986 is listed as meeting or exceeding OEM requirements for the specified HVAC pressure switch application. The part is built with a steel body and application-specific electrical and fitting details to support accurate replacement on Nissan D21 and Pathfinder vehicles.