Four Seasons 35845 A/C Clutch Cycle Switch

Temperature Switch for A/C Cycling

The Four Seasons Temperature Switch, part number 35845, is a system-mounted A/C clutch cycle switch built for 12-volt HVAC applications. It uses a driver-adjustable knob and cycling temperature control to help regulate compressor engagement in older Ford, Mercury, and Jeep systems.

Built with a metal body, open blade connector, and 2-terminal layout, this temperature switch meets or exceeds OEM requirements. The cap tube measures 34 in. (863.6 mm), with temperature off at 34 and temperature on at 52 for controlled A/C cycling.

Key Features

• Four Seasons Temperature Switch, part number 35845
• A/C clutch cycle switch with cycling temperature control
• Driver-adjustable knob for system setup
• Metal construction with metal color finish
• Open blade connector shape and 2 terminals
• System mount design for HVAC temperature control
• 12-volt electrical specification
• 34 in. cap tube length, 863.6 mm
• Meets or exceeds OEM specifications

Product Details

Four Seasons 35845 is a temperature switch used in dealer air and front-unit HVAC setups where compressor cycling must be controlled by temperature. This part cross-references Monroe Shocks & Struts 5845 for the same application. It is listed for a wide range of classic Ford, Mercury, and Jeep vehicles, including Fits 1973-1979 Ford F-100, N/A; Fits 1975-1979 Ford F-150, N/A; Fits 1976-1986 Jeep CJ7, N/A; and Fits 1974-1983 Jeep CJ5, N/A. Additional coverage includes Ford Courier, E-Series vans, Mustang, Fiesta, Pinto, and Mercury Capri, Zephyr, Lynx, and Monarch applications. The Four Seasons 35845 temperature switch is a direct-fit service part for restoring proper A/C clutch cycling in compatible vintage HVAC systems.

What It Helps Solve

• Compressor short-cycling caused by a worn temperature switch
• A/C systems that fail to cycle the clutch at the correct temperature
• Inconsistent cabin cooling in dealer air or front-unit setups
• HVAC temperature control issues in older Ford, Mercury, and Jeep vehicles
• Electrical switching problems at the A/C clutch circuit

Installation Notes and Tips

Install this switch in the system-mount location specified by the vehicle application. Verify the connector style, terminal count, cap tube routing, and temperature settings before installation. Because this part uses an open blade connector and a 34 in. cap tube, confirm the original harness and mounting layout match the vehicle’s HVAC configuration. Use the application notes for each vehicle, especially dealer air and integrated-control systems, to confirm proper placement.

Quality Assurance

Four Seasons lists this temperature switch as meeting or exceeding OEM specifications for fit and function. The metal construction and application-specific cycling design support reliable service in compatible HVAC systems.