Four Seasons 36574 HVAC Binary Switch

Four Seasons 36574 Pressure Switch Overview

The Four Seasons 36574 is a system-mounted HVAC binary pressure switch for Mercedes-Benz air conditioning systems. It uses a black, open connector design with a male 3/8 in. x 24 fitting and 2 terminals for pressure-based circuit control.

Built to meet or exceed OEM requirements, this Four Seasons Pressure Switch is a direct-fit replacement for select Mercedes-Benz models, including SL500, SL600, SL320, E320, and 190E applications.

Key Features

• Brand: Four Seasons Pressure Switch
• Part number: 36574
• HVAC binary switch with pressure-based operation
• System-mounted design
• Black housing with open connector shape
• Male fitting with 3/8 in. x 24 thread size
• 2-terminal configuration
• Meets or exceeds OEM specifications

Product Details

The Four Seasons 36574 pressure switch is used in HVAC systems that rely on pressure sensing to manage compressor operation and protect the air conditioning circuit. As a binary switch, it monitors system pressure and helps maintain proper A/C function across a wide range of Mercedes-Benz platforms. This part cross-references UAC SW10068C for the same application.

Compatible With Mercedes-Benz models such as 1994-1998 SL500, 1994-1998 SL600, 1994-1997 SL320, 1994-1995 E320, and 1985-1993 190E. The 36574 part number is also listed across multiple interchange references for broader catalog matching.

Common Issues This Part May Address

• A/C compressor not engaging due to pressure switch failure
• Intermittent HVAC operation from unstable pressure signal
• System shutdown caused by incorrect refrigerant pressure readings
• Fault codes or electrical issues related to the pressure switch circuit
• Poor air conditioning performance in Mercedes-Benz HVAC systems

Installation Notes and Tips

Verify the connector shape, 2-terminal layout, male 3/8 in. x 24 fitting, and system-mounted location before installation. Confirm the vehicle’s original pressure switch configuration against the part number 36574 and the listed Mercedes-Benz fitment, including SL500, SL600, SL320, E320, and 190E applications.

Inspect the HVAC system for refrigerant pressure concerns and connector condition before replacing the switch. Proper diagnosis helps ensure the new pressure switch addresses the root cause of the A/C issue.

Quality Assurance

Four Seasons lists this pressure switch as meeting or exceeding OEM requirements, supporting direct replacement use in select Mercedes-Benz HVAC systems. The part is cataloged under Four Seasons 36574 for accurate identification and fitment matching.