Four Seasons 37644 HVAC Blower Control Switch

Four Seasons 37644 HVAC Blower Control Switch

The Four Seasons Selector Switch 37644 is an HVAC blower control switch with a female rectangular 6-terminal connector. It is built for direct blower speed selection in supported Kia and Hyundai applications, including 2001-2006 Kia Optima and 2002-2003 Hyundai Sonata models.

Key Features

• Brand: Four Seasons Selector Switch line
• Part number: 37644
• HVAC blower control switch / selector switch design
• Female rectangular connector
• 6 terminals for blower circuit connection
• Type: Blower
• Direct-fit replacement for listed vehicle applications

Selector Switch Product Line

Four Seasons Selector Switch components are built for HVAC control functions where the driver needs reliable blower speed selection. This part number, 37644, is specified as a blower selector switch for vehicles that use a 6-terminal female rectangular connector layout.

Detailed Description

Four Seasons 37644 is an HVAC blower control switch used to manage blower motor operation through the vehicle’s selector interface. It is listed for 2001-2006 Kia Optima, including applications without ATC (Automatic Temperature Control), and for 2002-2003 Hyundai Sonata. The connector style, terminal count, and blower-switch configuration are important for proper electrical matching, especially on Kia Optima HVAC blower motor resistor harness setups where the ATC relay connector is noted as incompatible.

This part cross-references 1S9350 and 972693C000 for the same application.

What It Helps Solve

• Blower fan speeds that do not respond correctly to the selector switch
• Intermittent HVAC blower operation at one or more speed settings
• Worn or damaged blower control contacts in the dash HVAC panel
• Electrical connection issues at the female 6-terminal switch interface
• Replacement needs for 2001-2006 Kia Optima and 2002-2003 Hyundai Sonata HVAC controls

Installation Notes and Tips

Verify the connector shape, terminal count, and vehicle HVAC configuration before installation. For 2001-2006 Kia Optima, confirm the vehicle is without ATC and check the blower motor resistor harness connection details noted in the fitment data. Compare the existing switch and connector layout to Four Seasons 37644 before purchase and installation.

Quality Assurance

Four Seasons HVAC components are cataloged by application and connector specification to support accurate replacement selection. Confirm fitment against the vehicle year, make, model, and HVAC system configuration before ordering.

Fitment

• Fits 2001-2006 Kia Optima, N/A — Blower Motor Switch; w/o ATC (Automatic Temperature Control); Selector Switch
• Fits 2001-2006 Kia Optima, N/A — ATC relay connector incompatible with HVAC blower motor resistor harness.; Selector Switch
• Fits 2002-2003 Hyundai Sonata, N/A — Selector Switch
• Fits 2002-2003 Hyundai Sonata, N/A — Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch