Four Seasons 36572 A/C Trinary Switch

Four Seasons 36572 Trinary Pressure Switch

The Four Seasons Pressure Switch 36572 is a system-mounted A/C trinary switch built for 12-volt HVAC systems. It uses a 4-terminal rectangular female connector with Weather Pack protection and a 7/16" x 20 female fitting thread size for direct service replacement in supported BMW applications.

Four Seasons Pressure Switch components are used in automotive air conditioning control circuits to monitor refrigerant pressure and help manage compressor and fan operation. This trinary pressure switch meets or exceeds OEM requirements and is built with a steel body for dependable system mounting.

Key Features

• Part number 36572 from Four Seasons Pressure Switch line
• System-mounted trinary pressure switch for A/C clutch and compressor control
• 12-volt electrical design with 4 terminals
• Rectangular female connector with pin terminals
• Steel construction with Weather Pack connector protection
• Female fitting, 7/16" x 20 thread size
• Meets or exceeds OEM specifications

Vehicle Fitment

• Fits 1989-1995 BMW 525i, Pressure Switch
• Fits 1994-1995 BMW 530i, Pressure Switch
• Fits 1994-1995 BMW 540i, Pressure Switch
• Fits 1993-1994 BMW 740i, Pressure Switch
• Fits 1993-1994 BMW 740iL, Pressure Switch
• Fits 1988-1994 BMW 750iL, Pressure Switch
• Fits 1993 BMW 525iT, Pressure Switch
• Fits 1989-1993 BMW 535i, Pressure Switch
• Fits 1991-1993 BMW M5, Pressure Switch
• Fits 1987-1992 BMW 735i, Pressure Switch
• Fits 1988-1992 BMW 735iL, Pressure Switch

What It Helps Address

• Erratic A/C compressor cycling caused by pressure switch failure
• Loss of refrigerant pressure signal to the HVAC control circuit
• Cooling fan control issues tied to trinary switch operation
• Intermittent A/C engagement on BMW 525i, 535i, and M5 applications
• Pressure-related shutdowns in supported BMW 7 Series and 5 Series systems

Installation Notes and Tips

Verify connector style, terminal count, and fitting thread size before installation. This part cross-references Continental 50025 for the same application. Confirm the vehicle uses a system-mounted trinary pressure switch and match the original BMW HVAC configuration before replacing the component.

Quality Assurance

Four Seasons 36572 is built to meet or exceed OEM specifications for the listed BMW applications. The steel construction, 12-volt design, and Weather Pack connector support consistent service replacement in factory-style A/C systems.