Four Seasons 36675 A/C Clutch Cycle Switch

Four Seasons 36675 A/C Clutch Cycle Switch

The Four Seasons Pressure Switch 36675 is a system-mounted A/C clutch cycle switch built for R134a-equipped GM applications. It helps regulate compressor cycling by monitoring refrigerant pressure and using a 12-volt, 2-terminal electrical design with a round connector and Weather Pack connection.

Built with plastic and metal construction and engineered to meet or exceed OEM requirements, this pressure switch is a direct-fit HVAC service part for select Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles. The Four Seasons Pressure Switch line focuses on dependable pressure control for air conditioning systems that rely on accurate cycling performance.

Key Features

• Part number 36675 A/C clutch cycle switch for HVAC pressure control
• System mount design with female 7/16 in. x 20 thread fitting
• 2-pin male terminals with round connector shape
• 12-volt electrical specification
• Black plastic and metal construction
• Weather Pack connection for secure electrical interface
• Meets or exceeds OEM specifications
• Open at 0 psi with low-off at 20 psi and low-on at 44 psi

Detailed Description

Four Seasons 36675 is a pressure-based A/C clutch cycle switch used in R134a air conditioning systems to monitor refrigerant pressure and control compressor engagement. This style of switch is commonly used on 1989-1993 Chevrolet Blazer, C1500, C2500, K1500, K2500, and related GMC truck and SUV applications, along with select Buick Regal, Chevrolet Lumina APV, Oldsmobile Silhouette, and Pontiac Trans Sport models. If you are servicing a Chevrolet C1500 pressure switch or a GMC K1500 A/C clutch cycle switch, this part number is a direct reference to check against your original component.

This part cross-references MAHLE 4955 for the same application.

What It Helps Address

• Compressor cycling that is inconsistent or too frequent
• A/C clutch engagement issues related to refrigerant pressure sensing
• Loss of cooling performance caused by a faulty pressure switch
• Electrical connection problems at the HVAC pressure switch circuit
• Pressure control faults in R134a-equipped GM air conditioning systems

Installation Notes and Tips

Verify the original connector shape, terminal count, thread size, and pressure settings before installation. This switch uses a 7/16 in. x 20 female fitting and a 2-terminal Weather Pack electrical connection, so matching the original HVAC switch configuration is important for proper fitment. Confirm the vehicle uses R134a refrigerant and compare the existing switch location and connector style to the replacement part before service.

Quality Assurance

Four Seasons 36675 is manufactured to meet or exceed OEM specifications for pressure switch performance and fitment consistency. The Four Seasons Pressure Switch line is built for HVAC service applications where accurate compressor cycling and reliable electrical connection are required.