Four Seasons 37318 HVAC Binary Switch

Overview of Four Seasons Pressure Switch 37318

The Four Seasons Pressure Switch 37318 is designed for precise HVAC system control in select Audi vehicles. Engineered to meet or exceed OEM standards, this system-mounted pressure switch ensures reliable operation within the HVAC system of Audi A4, A4 Quattro, A8, and A8 Quattro models.

• Compatible with Audi A4, A4 Quattro, A8, and A8 Quattro
• System-mounted pressure switch with steel construction
• Operates between 190 PSI (low off) and 240 PSI (low on)
• Features a male connector and female fitting with 10mm x 1.25 thread size
• Includes 4 terminals for secure electrical connections
• Black color with a binary switch style for open/closed fan and compressor control

Detailed Product Description

The Four Seasons Pressure Switch 37318 is a binary HVAC switch designed to monitor and control pressure within the vehicle’s air conditioning system. Constructed from durable steel, this black pressure switch is system-mounted and features a male connector gender and female fitting with a 10mm x 1.25 thread size. It operates by opening and closing circuits based on pressure thresholds, with the compressor circuit closed and the fan circuit open under normal conditions. The switch activates at 240 PSI and deactivates at 190 PSI, ensuring proper system function and protection.

This part is specifically engineered for Audi A4, A4 Quattro, A8, and A8 Quattro models, providing a direct replacement that meets or exceeds OEM specifications. The inclusion of four terminals allows for reliable electrical connections, supporting consistent HVAC performance.

Applications and Common Issues Addressed

• Prevents HVAC system damage by monitoring refrigerant pressure
• Resolves intermittent or non-functioning air conditioning compressor issues
• Helps maintain proper fan operation within the HVAC system
• Addresses pressure-related HVAC system faults or error codes
• Supports system safety by preventing compressor operation under unsafe pressure conditions

Installation Notes and Tips

• Ensure the vehicle is compatible: Audi A4, A4 Quattro, A8, or A8 Quattro
• Verify system pressure is relieved before installation to avoid injury
• Use appropriate tools to install the female fitting with 10mm x 1.25 thread size securely
• Check electrical connections on the four terminals for proper engagement
• Confirm the switch is mounted in the system location as specified for accurate pressure sensing

Quality Assurance and Warranty

The Four Seasons Pressure Switch 37318 is manufactured to meet or exceed OEM quality standards, ensuring durability and reliable performance in demanding automotive HVAC applications. This part is backed by Four Seasons’ quality assurance protocols, providing confidence in its fitment and function for Audi A4, A4 Quattro, A8, and A8 Quattro vehicles. Warranty details are provided by Four Seasons and typically cover defects in material and workmanship.

About the Four Seasons Pressure Switch Product Line

The Four Seasons Pressure Switch product line focuses on delivering precise pressure monitoring components for automotive HVAC systems. These binary switches are designed to open or close circuits based on system pressure, protecting critical components such as compressors and fans. The Pressure Switch line, including part number 37318, is engineered to provide reliable, system-mounted solutions that integrate seamlessly with vehicle HVAC systems, ensuring consistent climate control performance.