Four Seasons 20979 HVAC Binary Switch

Four Seasons 20979 Pressure Switch Overview

The Four Seasons Pressure Switch 20979 is a system-mounted HVAC binary switch built for pressure monitoring in automotive air conditioning systems. It uses an oval female connector, a male 3/8 in. x 24 fitting thread, and a two-terminal black steel design that meets or exceeds OEM requirements.

Compatible With Nissan Pathfinder, 240SX, D21, Sentra, and NX applications, this pressure switch is a direct-fit service part for select Nissan HVAC systems. Four Seasons 20979 is also cross-referenced to UAC SW11219C for the same application.

Key Features

• Binary HVAC pressure switch for system-mounted installation
• Oval female connector with 2 terminals
• Black steel construction for automotive HVAC service
• Male fitting with 3/8 in. x 24 thread size
• Meets or exceeds OEM specifications
• Direct replacement for select Nissan air conditioning pressure switch applications

Detailed Description

Four Seasons 20979 is an HVAC binary pressure switch used to monitor refrigerant system pressure and support proper air conditioning operation. The switch is designed with an open comp configuration, a system-mounted layout, and a compact oval connector shape for select Nissan HVAC setups. It is a practical replacement choice when servicing pressure switch faults on 1989-1995 Nissan 240SX, 1990-1994 Nissan Sentra, 1991-1992 Nissan NX, 1993-1994 Nissan D21, and 1993-1995 Nissan Pathfinder models.

This Four Seasons pressure switch is built to OE-level specifications and is intended for vehicles that require a binary pressure switch with the listed connector and thread configuration. The Four Seasons 20979 part number is commonly searched for Nissan Pathfinder pressure switch replacement, Nissan 240SX HVAC pressure switch service, and Nissan Sentra air conditioning pressure switch repair.

What It Helps Fix

• Air conditioning compressor cycling caused by a failed pressure switch
• HVAC system shutdown related to incorrect refrigerant pressure signal
• Intermittent A/C operation on Nissan 240SX, Sentra, Pathfinder, D21, or NX models
• Faulty pressure switch electrical connection at the oval female connector
• Pressure switch replacement needs during HVAC diagnosis and repair

Installation Notes and Tips

Verify the connector shape, terminal count, and 3/8 in. x 24 fitting thread before installation. Match the vehicle’s original pressure switch style and system-mounted location to confirm proper fitment. For best results, compare the old switch to Four Seasons 20979 before service and follow the vehicle manufacturer’s HVAC procedures during replacement.

Quality Assurance

Four Seasons 20979 is manufactured to meet or exceed OEM specifications for the listed applications. Four Seasons is a recognized HVAC parts brand, and this pressure switch is built for direct replacement use in select Nissan air conditioning systems.