Four Seasons 20944 A/C Trinary Switch

Reliable A/C Trinary Pressure Switch for Acura, Honda, Toyota, and More

The Four Seasons Pressure Switch part number 20944 is a system-mounted trinary pressure switch designed for precise control of your vehicle's A/C clutch and compressor. Engineered to meet or exceed OEM specifications, this 12-volt switch is compatible with a range of models including Acura MDX, Honda Accord, Toyota Camry, and Lexus RX-8.

• 12-volt system operation with four terminals and pin-type connectors
• Male connector and fitting with M11 x 1.00 thread size
• Operates at specific pressure points: low on at 30 PSI, medium on at 220 PSI, medium off at 180 PSI, and high on at 350 PSI
• Steel construction for durability and weather pack sealed for environmental protection
• System-mounted design for direct integration with HVAC components

About the Four Seasons Pressure Switch Product Line

The Pressure Switch line from Four Seasons focuses on delivering reliable HVAC pressure control components that ensure proper operation of A/C clutches and compressors. The 20944 trinary switch is part of this line, providing accurate pressure sensing and switching functions to protect your vehicle’s air conditioning system and maintain optimal performance.

Detailed Product Description

This Four Seasons Pressure Switch 20944 is a trinary pressure switch designed to monitor and control refrigerant pressure within the A/C system. It features a male pin-type connector with four terminals and a male fitting with an M11 x 1.00 thread size for secure installation. The switch operates at multiple pressure thresholds: it activates the fan at low pressure (30 PSI) and high pressure (350 PSI) to protect the system, while controlling the compressor clutch engagement between 180 and 220 PSI. Constructed from steel and sealed with a weather pack connector, it is built to withstand harsh under-hood conditions. Compatible with various Acura, Honda, Lexus, Mazda, Pontiac, and Toyota models, this switch ensures proper HVAC system function and longevity.

Common Applications and Issues Addressed

• Prevents compressor damage by regulating clutch engagement based on refrigerant pressure
• Activates cooling fans to avoid overheating during high-pressure conditions
• Maintains system pressure to optimize A/C performance in vehicles like the Honda Accord and Toyota Camry
• Replaces faulty or worn pressure switches causing intermittent A/C operation
• Ensures proper HVAC system cycling in Acura MDX and Lexus RX-8 models

Installation Notes and Tips

• Ensure vehicle compatibility by verifying make and model fitment before installation
• Disconnect the battery before replacing the pressure switch to avoid electrical shorts
• Use appropriate tools to remove the M11 x 1.00 threaded fitting without damaging surrounding components
• Check for refrigerant leaks after installation and recharge the system if necessary
• Confirm connector terminals are securely attached to prevent electrical issues

Quality Assurance and Warranty

The Four Seasons Pressure Switch 20944 meets or exceeds OEM standards for fit, form, and function. Manufactured with durable steel and sealed connectors, it is designed for long-term reliability in demanding automotive environments. This part is backed by Four Seasons’ quality assurance protocols, ensuring consistent performance and compatibility with specified Acura, Honda, Lexus, Mazda, Pontiac, and Toyota models.