Four Seasons 35889 HVAC Pressure Switch

Four Seasons 35889 Trinary Pressure Switch

The Four Seasons Pressure Switch 35889 is a system-mounted HVAC trinary pressure switch built for 12-volt applications. It uses a 4-terminal, open connector design with a female 7/16" x 20 fitting and metal construction for service in automotive air conditioning systems.

As part of the Four Seasons Pressure Switch line, this component is engineered as an OE-style HVAC pressure control solution for vehicles that rely on accurate refrigerant pressure monitoring. It meets or exceeds OEM requirements and is a direct-fit style replacement for select applications, including Chrysler, Dodge, and Jeep HVAC systems where a trinary pressure switch is specified.

Key Features

• Four Seasons HVAC pressure switch, part number 35889
• System-mounted trinary pressure switch for automotive A/C control
• 12-volt electrical design with 4 terminals
• Open connector shape and female 7/16" x 20 fitting
• Metal housing for durable HVAC service
• Open compressor circuit and closed fan circuit configuration
• Operates at 230 psi medium-on pressure
• Meets or exceeds OEM specifications

Detailed Description

The Four Seasons 35889 pressure switch is designed for HVAC systems that use a trinary pressure switch to monitor refrigerant pressure and manage compressor and fan operation. Its system-mounted layout, open connector style, and female threaded fitting support straightforward replacement in applications that call for this exact configuration. If you are servicing a Chrysler, Dodge, or Jeep air conditioning system, this part number 35889 is a relevant OE-style reference for pressure-based HVAC control.

This switch is built with a metal body and a 4-terminal layout, with the compressor circuit set open and the fan circuit set closed in its normal state. The 230 psi medium-on operating point helps the HVAC system respond to pressure changes as designed. This part cross-references BBB Industries 11018 for the same application.

What It Helps Address

• Compressor cycling caused by a failed HVAC pressure switch
• Cooling fan control issues tied to refrigerant pressure sensing
• Air conditioning shutdown from incorrect system pressure readings
• Intermittent HVAC operation in Chrysler, Dodge, and Jeep vehicles
• Replacement needs for a worn or electrically inconsistent trinary switch

Installation Notes and Tips

• Verify the connector style, terminal count, and 7/16" x 20 female thread before installation.
• Confirm the vehicle uses a system-mounted trinary pressure switch with the same open/closed circuit logic.
• Inspect the HVAC system for refrigerant charge and pressure-related faults before replacing the switch.
• Use the vehicle service information to confirm the correct Chrysler, Dodge, or Jeep application for part number 35889.

Quality Assurance

Four Seasons identifies this pressure switch as meeting or exceeding OEM requirements, making it a specification-based replacement for HVAC service work. The Four Seasons 35889 is built to match the electrical and mechanical requirements of the original system design.