Four Seasons 35992 HVAC Blower Control Switch - Front

HVAC Blower Control Switch for Manual Systems

The Four Seasons Selector Switch 35992 is an HVAC blower control switch built for vehicles with manual blower operation. It uses a male rectangular connector with 4 terminals and meets or exceeds OEM requirements for direct replacement service.

Four Seasons Selector Switch products are built for accurate electrical control in heating and air conditioning systems, making this part a practical choice when the original blower selector becomes intermittent, stiff, or fails to change fan speeds correctly.

Key Features

• HVAC blower control switch for manual selector operation
• Male rectangular connector for proper harness connection
• 4-terminal design
• Meets or exceeds OEM specifications
• Four Seasons part number 35992
• Cross-reference: DENSO Auto Parts 5029

Detailed Product Information

This blower switch is used in a wide range of classic GM applications, including Chevrolet El Camino, Caprice, Impala, Malibu, Monte Carlo, GMC P2500 and P3500, and other Buick, Oldsmobile, Pontiac, and Cadillac models listed in the fitment data. It is a direct-fit HVAC blower control switch for vehicles with manual lever control, including front-position applications where specified.

Use Four Seasons 35992 when you need a replacement selector switch for HVAC systems that rely on a mechanical blower control interface rather than automatic climate control. The part is listed across model years from 1975 through 1990, with fitment varying by make, model, position, and equipment package.

Common Problems This Part Can Address

• Blower fan only works on certain speed settings
• HVAC selector feels loose, sticky, or inconsistent
• No response when changing fan speed
• Intermittent cabin airflow from a worn switch contact
• Failed manual blower control in older GM HVAC systems

Installation Notes and Tips

Verify the vehicle year, make, model, position, and HVAC configuration before ordering. This switch uses a male rectangular connector and 4 terminals, so compare the connector shape and terminal count to the original part before installation. For best results, inspect the harness connector and surrounding HVAC control components for heat damage, corrosion, or worn terminals.

Fits 1985-1990 GMC P3500, selector switch applications; fits 1985-1989 GMC P2500, selector switch applications; fits 1978-1985 Chevrolet El Camino, manual lever control HVAC blower switch applications; fits 1983-1984 Chevrolet C10 Suburban and C20 Suburban, manual lever control HVAC blower switch applications; fits 1982-1983 Buick Regal and 1978-1983 Buick Regal, blower motor switch applications where equipped as listed.

Quality Assurance

Four Seasons 35992 is listed as meeting or exceeding OEM specifications for the application. This part cross-references UAC SW1069 for the same application.