Four Seasons 73643 HVAC Mode Valve Actuator Gear

HVAC Actuator Gear for Temperature Control

Four Seasons 73643 is an HVAC actuator gear for temperature control systems that use a gear-style door linkage. It is built for direct replacement service on select Buick, Cadillac, and Chevrolet applications, including Buick Regal, Buick Verano, Buick LaCrosse, Chevrolet Cruze, Chevrolet Malibu, and Chevrolet Volt.

Four Seasons HVAC Actuator Gear line focuses on replacement parts engineered and tested for dependable operation in mobile A/C and heating systems. This part number, 73643, is a practical choice when the HVAC mode valve gear is worn, stripped, or no longer moving the blend or mode door correctly.

Key Features

• HVAC Mode Valve Actuator Gear for temperature control repair
• Door linkage style: gear
• Four Seasons HVAC Actuator Gear line
• Direct-fit replacement for select Buick, Cadillac, and Chevrolet vehicles
• Part number 73643 for accurate ordering and service matching

Detailed Description

This HVAC actuator gear is used in temperature control systems where the door linkage relies on a gear-driven mechanism to move the HVAC mode valve. It is listed for 2011-2017 Buick Regal, 2012-2017 Buick Verano, 2011-2016 Buick LaCrosse, 2014-2016 Cadillac ELR, 2016 Chevrolet Cruze Limited, 2013-2016 Chevrolet Malibu, 2016 Chevrolet Malibu Limited, 2011-2015 Chevrolet Cruze, and 2011-2015 Chevrolet Volt. If you are searching for a Four Seasons 73643 HVAC actuator gear for a Buick Regal or Chevrolet Malibu HVAC repair, this part matches the specified applications.

This part cross-references 926758 and 13263335 for the same application.

What It Helps Fix

• HVAC mode door movement that stops responding
• Temperature control issues caused by a stripped gear
• Inconsistent air distribution through the dash vents
• Clicking or binding from the HVAC actuator gear area
• Loss of proper blend or mode door positioning

Installation Notes and Tips

Verify the vehicle year, make, and model before ordering. Confirm the existing HVAC actuator gear style and compare the original part number, especially when servicing a Buick Verano, Chevrolet Cruze, or Chevrolet Volt. Inspect the related door linkage and actuator components for wear before installation so the replacement can restore normal HVAC operation.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation, drawing on more than 50 years of mobile A/C experience. Part number 73643 is backed by that product development approach for HVAC service work.