Four Seasons 36499 A/C Trinary Switch

Four Seasons 36499 Trinary Pressure Switch

The Four Seasons Pressure Switch 36499 is a system-mounted A/C trinary switch built for 12-volt HVAC systems. It monitors refrigerant pressure and helps manage compressor and fan operation in the air conditioning circuit.

Key Features

• System-mounted trinary pressure switch for A/C clutch and compressor control
• 12-volt electrical design with 4 terminals
• Female connector and female fitting with 7/16" x 20 thread size
• Pressure operating points: 30 psi low on, 220 psi medium on, 330 psi high on
• Weather Pack sealed connection
• Plastic and metal construction
• Meets or exceeds OEM requirements

Detailed Description

Four Seasons 36499 is a pressure-style trinary switch used in HVAC systems to help regulate compressor engagement and fan control based on refrigerant pressure. This system-mounted switch is built with a female connector, female fitting, and 7/16" x 20 thread size for direct service replacement in the A/C circuit. It is a practical choice for Volkswagen Golf and Volkswagen Jetta applications from 1990-1994 where the original pressure switch needs replacement.

This Four Seasons Pressure Switch line is focused on dependable HVAC control components for A/C clutch and compressor systems. Part number 36499 is engineered to meet or exceed OEM specifications and is cross-referenced with UAC SW9600C for the same application.

What It Is Used For

• Restoring A/C compressor cut-in and cut-out pressure control
• Correcting inoperative condenser fan activation tied to refrigerant pressure
• Replacing a failed trinary switch that causes intermittent cooling performance
• Addressing A/C system shutdown caused by pressure signal faults
• Supporting proper HVAC operation in 1990-1994 Volkswagen Golf and Jetta models

Installation Notes and Tips

Verify the connector style, 4-terminal layout, and 7/16" x 20 fitting thread before installation. Confirm the replacement switch matches the vehicle’s pressure control strategy and inspect the A/C system for leaks, wiring damage, or connector corrosion before returning the system to service. For Volkswagen Golf and Volkswagen Jetta, match the original system-mounted location and pressure specifications to the OE part.

Quality Assurance

Four Seasons 36499 is built to meet or exceed OEM standards for pressure switch replacement in automotive HVAC systems. Its sealed Weather Pack connection and OE-style construction support reliable service in A/C clutch and compressor applications.