Four Seasons 36572 A/C Trinary Switch

Overview of Four Seasons Pressure Switch 36572

The Four Seasons Pressure Switch 36572 is a system-mounted trinary pressure switch designed for select BMW models. Engineered to meet or exceed OEM specifications, this 12-volt switch plays a critical role in the HVAC system by monitoring pressure and controlling the A/C clutch and compressor operation.

• Voltage: 12V compatible with standard automotive electrical systems
• Terminal Type: Pin terminals for secure electrical connections
• Connector Shape: Rectangular female connector for precise fitment
• Fitting Thread Size: 7/16" x 20 with female fitting gender
• Material: Durable steel construction for long-lasting performance
• Number of Terminals: 4 terminals to support system functions
• Weather Pack compatible for reliable operation in various conditions
• Comp Open/Closed: Open; Fan Open/Closed: Closed for system control

About the Four Seasons Pressure Switch Product Line

The Four Seasons Pressure Switch product line focuses on delivering reliable pressure sensing components for automotive HVAC systems. The Pressure Switch 36572 is part of this line, designed specifically to provide accurate pressure monitoring and control in A/C clutch and compressor circuits. This ensures proper system operation and helps maintain optimal climate control performance in vehicles such as BMW 525i, 530i, and M5 models.

Detailed Product Description

This A/C trinary switch is system-mounted and features a rectangular female connector with pin terminals, ensuring a secure and precise electrical connection. The switch operates at 12 volts and includes four terminals to manage compressor and fan functions effectively. Its steel construction offers durability, while the 7/16" x 20 female fitting thread size allows for straightforward installation. The switch is designed to open the compressor circuit and close the fan circuit under specific pressure conditions, contributing to the overall efficiency and safety of the HVAC system.

Applications and Common Issues Addressed

• Regulates A/C compressor engagement in BMW 525i, 535i, and 740i models
• Prevents compressor damage by monitoring system pressure
• Controls cooling fan operation to maintain optimal engine temperature
• Helps avoid HVAC system failures related to pressure irregularities
• Ensures proper cycling of A/C clutch for consistent climate control

Installation Notes and Tips

When installing the Four Seasons Pressure Switch 36572, ensure the system is depressurized and the vehicle’s electrical system is disconnected to avoid injury. The female rectangular connector and pin terminals should be checked for corrosion or damage before connection. Use the correct 7/16" x 20 fitting thread size to secure the switch firmly in place. Verify compatibility with your specific BMW model, including 525iT, 735iL, and M5, to ensure proper fitment and function.

Quality Assurance and Warranty

The Four Seasons Pressure Switch 36572 meets or exceeds OEM standards, providing reliable performance and durability. Manufactured with high-quality steel and designed for weather-resistant operation, this switch is built to withstand demanding automotive environments. Please refer to Four Seasons’ warranty policy for specific coverage details.