Four Seasons 36674 A/C Clutch Cycle Switch

Four Seasons 36674 A/C Clutch Cycle Switch

Four Seasons 36674 is a pressure-based A/C clutch cycle switch for vehicles using R134a refrigerant. This system-mount switch helps regulate compressor cycling by responding to low-side pressure changes, supporting stable air conditioning performance in a wide range of Buick, Chevrolet, GMC, Oldsmobile, Pontiac, Volvo, and Cadillac applications.

Built with a plastic and metal housing, a black finish, and a 2-terminal blade connection, this Four Seasons Pressure Switch meets or exceeds OEM requirements. The female 7/16 in. x 20 fitting and open connector shape make it a direct-fit service part for many classic GM and Volvo HVAC systems.

Key Features

• Part number 36674 A/C clutch cycle switch from Four Seasons Pressure Switch
• Pressure-operated cycling switch for system mount HVAC applications
• 12-volt electrical design with 2 male blade terminals
• Female 7/16 in. x 20 fitting thread size
• Open connector shape, black plastic/metal construction
• Meets or exceeds OEM specifications
• Fits vehicles using R134a refrigerant

Product Details

Four Seasons 36674 is used to monitor refrigerant pressure and cycle the A/C compressor clutch as system pressure changes. That makes it a practical replacement for drivers servicing older HVAC systems in models such as Chevrolet Camaro, Chevrolet Caprice, GMC Jimmy, Pontiac Firebird, Buick LeSabre, and Volvo 740. If you are searching for a Four Seasons 36674 pressure switch for R134a-equipped GM or Volvo vehicles, this part provides the correct pressure-switch style and electrical configuration for the listed applications.

This part cross-references Anchor 3225 and Bosch 13650 for the same application.

Common Issues It Can Help Resolve

• A/C compressor clutch that cycles incorrectly
• Intermittent compressor engagement caused by pressure-switch wear
• Loss of cooling performance from inaccurate pressure sensing
• HVAC system shutdown related to pressure switch failure
• Service replacement for aging R134a A/C control components

Installation Notes and Tips

• Verify the vehicle uses R134a refrigerant and matches the listed fitment before installation.
• Inspect the connector, terminals, and fitting threads for corrosion or damage before transfer.
• Confirm the system mount location and 7/16 in. x 20 female thread specification match the original part.
• Recover refrigerant and follow proper HVAC service procedures before removing the switch.
• After installation, check compressor cycling and system pressure operation.

Quality Assurance

Four Seasons 36674 is engineered to meet or exceed OEM requirements for pressure-switch service. The Four Seasons Pressure Switch line is built for direct replacement use in factory-style HVAC systems, including applications across Buick Century, Chevrolet S10, and Pontiac Bonneville platforms.