Four Seasons 36577 HVAC Cut-Off Switch

Four Seasons 36577 Pressure Switch Overview

The Four Seasons Pressure Switch 36577 is a system-mounted HVAC cut-off switch built for 12-volt air conditioning systems. It uses a wire-lead, 2-terminal design with a male 1/8 in. pipe fitting and a high cut-out operating range to monitor refrigerant pressure and interrupt compressor operation when pressure reaches the specified limit.

Compatible With BMW 525i, 535i, 535is, 635CSi, and M6 applications that use a high-pressure A/C system mounted on the filter/drier. This Four Seasons 36577 pressure switch meets or exceeds OEM requirements and is listed for direct replacement use in the confirmed BMW fitments below.

Key Features

• Brand: Four Seasons Pressure Switch line
• Part number: 36577
• HVAC cut-off switch, pressure type
• High cut-out style with closed compressor open/closed state
• System mounted design for A/C pressure monitoring
• Wire lead connector with 2 terminals
• Male fitting with 1/8 in. pipe thread (13/32 x 27)
• 12-volt electrical specification
• Plastic and metal construction
• Meets or exceeds OEM requirements

Detailed Description

Four Seasons 36577 is a pressure-operated HVAC cut-off switch used in high-pressure A/C circuits to monitor system pressure and control compressor engagement. The switch is system mounted and designed for applications that place the pressure switch on the filter/drier, making it a direct-fit service part for the confirmed BMW applications. The Four Seasons Pressure Switch product line focuses on replacement HVAC control components for pressure-based system protection and operation.

This part cross-references AMS Automotive 4979 and Global Parts Distributors LLC 1711423 for the same application. It is also associated with BMW 525i, 535i, 535is, 635CSi, and M6 fitments where the original system uses a high-pressure cut-off switch in the A/C circuit. Four Seasons 36577 is a practical replacement when the original pressure switch no longer opens and closes at the specified pressure range.

What This Part Helps Address

• A/C compressor cycling caused by a failed pressure switch
• Compressor cut-off issues related to high refrigerant pressure
• Loss of HVAC system pressure monitoring
• Electrical signal interruption at the pressure switch circuit
• Filter/drier mounted switch replacement needs on BMW A/C systems

Installation Notes and Tips

• Verify the connector style, 2-terminal wire lead layout, and 1/8 in. pipe thread before installation.
• Confirm the vehicle uses a system-mounted, filter/drier pressure switch location.
• Inspect the A/C circuit for pressure-related faults before replacing the switch.
• Use the confirmed fitment data for BMW 525i, 535i, 535is, 635CSi, and M6 applications only.

Quality Assurance

Four Seasons 36577 is listed as meeting or exceeding OEM requirements, supporting OE-style replacement expectations for the confirmed BMW applications.