Four Seasons 35991 HVAC Blower Control Switch

HVAC Blower Control Switch Overview

The Four Seasons Selector Switch 35991 is an HVAC blower control switch built for manual lever-operated climate systems. It uses a male rectangular connector with 4 terminals and meets or exceeds OEM requirements for direct replacement service. This Four Seasons 35991 selector switch is a practical choice for restoring blower speed control in select Buick, Chevrolet, Oldsmobile, and Pontiac applications.

Key Features

• Brand: Four Seasons Selector Switch
• Part number: 35991
• HVAC blower control switch / selector switch design
• Male rectangular connector
• 4-terminal electrical connection
• Meets or exceeds OEM specifications
• Direct-fit style replacement for manual HVAC systems

Product Details

Four Seasons Selector Switch 35991 is designed for vehicles with manual blower control, where the dash lever or selector no longer changes fan speed correctly. It is listed for a wide range of older GM platforms, including Buick Century, Buick LeSabre, Buick Park Avenue, Chevrolet Celebrity, Oldsmobile Cutlass Ciera, Oldsmobile Cutlass Cruiser, Pontiac 6000, Pontiac Bonneville, Pontiac Safari, Pontiac Sunbird, Buick Regal, and Buick Skylark. This part cross-references DENSO Auto Parts 5037 and Gates 33946 for the same application.

The Selector Switch product line from Four Seasons focuses on HVAC electrical controls and replacement components for climate system service. For buyers searching by vehicle, this part number 35991 is commonly referenced for manual lever control HVAC blower switch repair on select Buick Century and Pontiac 6000 applications, as well as other GM models listed in the fitment data.

Common Problems This Part Can Address

• Blower fan speeds do not change when the selector is moved
• Intermittent HVAC blower operation at certain settings
• Worn or damaged manual HVAC control switch contacts
• Broken or loose switch connector engagement
• Loss of blower control in vehicles with manual AC or non-ATC systems

Installation Notes and Tips

Verify the vehicle year, make, model, and HVAC configuration before ordering. Fitment includes manual lever control systems and, on some applications, vehicles without ATC or with manual AC. Confirm the connector shape, terminal count, and switch style match the original part before installation. For search relevance, this part is often used in Buick Century HVAC blower control switch repair, Pontiac 6000 blower motor switch replacement, and Oldsmobile Cutlass Ciera selector switch service.

Quality Assurance

This Four Seasons HVAC blower control switch meets or exceeds OEM specifications for replacement use. It is built for service in the listed applications and is intended to restore proper blower selector function in compatible manual HVAC systems.