Four Seasons 36571 HVAC Binary Switch

Four Seasons 36571 Pressure Switch Overview

The Four Seasons Pressure Switch 36571 is a system-mounted HVAC binary switch built for pressure monitoring in the air conditioning circuit. It uses a rectangular female connector, a 2-terminal layout, and a black steel body with a 7/16 in. x 20 female fitting thread size for a direct OE-style service replacement.

Compatible with select BMW models, including BMW 325i, BMW 318i, BMW 318is, BMW 325is, BMW 325iX, BMW M3, BMW 325e, and BMW 325es applications, this Four Seasons 36571 pressure switch is specified for pressure switch service on the HVAC system.

Key Features

• Binary HVAC pressure switch for system-mounted applications
• Rectangular female connector with 2 terminals
• Black steel construction
• Female fitting with 7/16 in. x 20 thread size
• Meets or exceeds OEM requirements
• Four Seasons Pressure Switch line for HVAC service parts

Detailed Description

Four Seasons 36571 is an HVAC binary pressure switch used to monitor refrigerant system pressure and support proper compressor circuit operation. The open-comp style and system-mounted design make it a direct-fit service part for BMW air conditioning repairs where the original pressure switch has failed or is no longer responding correctly. This part cross-references Global Parts Distributors LLC 1711418 for the same application.

As part of the Four Seasons Pressure Switch product line, this component is built for HVAC service applications that require accurate pressure-based switching and OE-style fitment. It is a practical replacement for BMW 325i and BMW M3 pressure switch service, as well as other listed BMW 3 Series applications.

What It Is Used For

• Restoring HVAC compressor control when the pressure switch no longer signals correctly
• Addressing intermittent A/C engagement caused by a faulty binary switch
• Replacing a damaged or corroded system-mounted pressure switch
• Correcting refrigerant circuit pressure-signal faults in BMW HVAC service
• Supporting proper A/C system operation on select BMW 325i, 318i, and M3 models

Installation Notes and Tips

Verify the connector shape, terminal count, and 7/16 in. x 20 female thread size before installation. Confirm the vehicle’s original pressure switch style and mounting location match the listed specifications for BMW 325i, BMW 318i, BMW 325is, BMW 325iX, and BMW M3 applications. Inspect the connector and sealing surfaces during replacement to help ensure a secure electrical and mechanical connection.

Quality Assurance

Four Seasons 36571 meets or exceeds OEM requirements and is built as an OE-style HVAC service replacement for the listed BMW applications.