Four Seasons 37552 A/C Trinary Switch

Four Seasons 37552 A/C Trinary Switch

The Four Seasons 37552 is a system-mounted A/C trinary pressure switch for 12-volt HVAC systems. It monitors refrigerant pressure and helps control compressor operation and condenser fan response in Hyundai and Kia applications that use a 4-terminal, weather-pack style switch.

Four Seasons Pressure Switch products are built from plastic and metal components and backed by more than 50 years of mobile A/C experience. This line focuses on dependable pressure control for automotive air conditioning systems, with fitment coverage for select Hyundai Elantra, Sonata, Santa Fe, Tucson, Tiburon, XG300, XG350, and Kia Optima and Sedona models.

Key Features

• Part number: 37552
• System-mounted trinary pressure switch
• 4 blade terminals with female rectangular connector
• 3/8 in. x 24 fitting thread size
• 12-volt electrical design
• Weather-pack style connector
• Pressure operating points: low on 36 psi, low off 28 psi, medium on 220 psi, medium off 160 psi, high on 370 psi, high off 455 psi
• Black plastic and metal construction

Detailed Description

Four Seasons 37552 is an A/C trinary switch used in system-mounted HVAC pressure control circuits. It provides pressure-based switching for compressor and fan management, helping the air conditioning system respond to low, normal, and high refrigerant pressure conditions. This part cross-references UAC SW11460C for the same application. It is a direct-fit pressure switch solution for select Hyundai and Kia vehicles, including Hyundai Elantra, Sonata, Santa Fe, Tucson, Tiburon, XG300, and XG350, plus Kia Optima and Sedona models.

What It Helps Fix

• A/C compressor cycling caused by incorrect pressure switch operation
• Condenser fan control issues tied to trinary switch failure
• Loss of compressor engagement from open or failed pressure sensing
• Intermittent air conditioning performance in Hyundai and Kia HVAC systems
• Pressure-related shutdowns in system-mounted A/C circuits

Installation Notes and Tips

• Verify the connector style, terminal count, and 3/8 in. x 24 thread size before installation.
• Confirm the vehicle uses a system-mounted trinary pressure switch and matches the listed fitment.
• Inspect the A/C system for refrigerant charge issues before replacing the switch.
• Check the connector and terminals for corrosion, looseness, or heat damage during service.
• Use the vehicle service information for proper diagnosis and replacement procedures.

Quality Assurance

Four Seasons engineers and tests its mobile A/C components for long service life and consistent operation. The 37552 reflects the brand’s focus on proven HVAC replacement parts for repair work that needs to be done correctly the first time.

Fitment

• Fits 2005-2009 Hyundai Tucson, N/A
• Fits 2003-2008 Hyundai Tiburon, N/A
• Fits 2001-2006 Hyundai Elantra, N/A
• Fits 2001-2005 Hyundai Santa Fe, N/A
• Fits 1999-2005 Hyundai Sonata, N/A
• Fits 2002-2005 Hyundai XG350, N/A
• Fits 2001-2005 Kia Optima, N/A
• Fits 2002-2005 Kia Sedona, N/A
• Fits 2001 Hyundai XG300, N/A