Four Seasons 37308 A/C Clutch Cycle Switch

Four Seasons 37308 A/C Clutch Cycle Switch

The Four Seasons 37308 pressure switch is a system-mount A/C clutch cycle switch built for 12-volt HVAC systems that use a cycling pressure control strategy. It features a female M12 x 1.50 fitting, 2-pin male terminals, and Weather Pack sealing for dependable electrical connection in demanding underhood conditions.

Key Features

• Pressure-type cycling switch for A/C clutch control
• System mount design with female M12 x 1.50 thread
• 12-volt operation with 2-pin male terminal connection
• Plastic and metal construction
• Weather Pack sealed connector for improved protection
• Meets or exceeds OEM requirements
• Open at 0 psi with low-off at 25 psi and low-on at 44 psi

Product Details

Four Seasons Pressure Switch line components are built for HVAC service where accurate pressure-based cycling is required. Part number 37308 is a pressure switch / system mount unit that helps regulate compressor clutch operation based on refrigerant pressure, supporting stable A/C performance in vehicles that use a cycling switch setup. This part cross-references Gates 20913 for the same application. Common fitment includes Chevrolet Express 2500, GMC Savana 3500, and Chevrolet Silverado 1500 applications across multiple model years.

What It Helps Address

• Compressor clutch cycling that is too frequent or too delayed
• A/C system pressure switch faults that trigger poor cooling performance
• Intermittent compressor engagement caused by worn switch contacts
• Electrical connection issues at the HVAC pressure switch circuit
• Replacement needs on vehicles with a failed cycling pressure switch

Installation Notes and Tips

Verify the thread size, terminal style, and connector type before installation. Confirm vehicle-specific fitment for your Chevrolet Express, GMC Savana, Silverado, Sierra, Tahoe, Yukon, or related application, since this part is used across multiple years and configurations. Inspect the connector, seal, and surrounding HVAC components during service, and compare the original switch’s pressure range and mounting style before replacement. Fits 2019-2025 Chevrolet Express 2500, N/A; Fits 2019-2025 Chevrolet Express 3500, N/A; Fits 2019-2025 GMC Savana 2500, N/A; Fits 2019-2025 GMC Savana 3500, N/A.

Quality Assurance

Four Seasons 37308 is listed as meeting or exceeding OEM specifications, with Weather Pack sealing and OE-style construction for HVAC service. The part is designed for direct replacement use in supported applications and is backed by Four Seasons brand manufacturing standards.