Dorman 604-178 HVAC Blend Door Actuator - Main

Dorman 604-178 HVAC Blend Door Actuator

This HVAC blend door actuator is built for specific Chevrolet, Pontiac, and Saturn applications that use automatic temperature control. Dorman 604-178 is a rotary-style replacement for the main air inlet actuator, made with a plastic housing and engineered to match the function of the original unit.

Key Features

• Rotary switch activation for HVAC blend door control
• Plastic construction for direct replacement use
• Supplied as an actuator only
• OE-style replacement for the main air inlet position
• Cross-references Monroe Shocks & Struts 172286 and 182286 for the same application

Detailed Description

Dorman 604-178 is a heater blend door actuator for vehicles equipped with automatic temperature control systems. It is precision-engineered to match the quality and performance of the original blend door actuator, helping restore proper HVAC door movement in the dash air inlet circuit. This part number is commonly searched for Chevrolet Malibu HVAC blend door actuator replacement, Pontiac G6 blend door actuator, and Saturn Aura heater actuator service.

Compatible With 2008-2012 Chevrolet Malibu, Main; 2006-2010 Pontiac G6, Main; and 2007-2009 Saturn Aura, Main. For buyers comparing Dorman 604-178 against OE references, this actuator also cross-references 15844241, ADS147, APBDA0261, and F04070.

Common Issues This Part Can Help Address

• Incorrect cabin temperature control
• HVAC air stuck on one temperature setting
• Blend door movement loss in the main air inlet circuit
• Clicking or inconsistent actuator operation behind the dash
• Loss of automatic temperature control response

Installation Notes and Tips

Verify the vehicle’s HVAC system uses Automatic Temperature Control (ATC) or, for Malibu applications, RPO code C68 with Front Automatic Electronic Temperature Controls before ordering. Confirm the main air inlet position and compare the original connector and mounting points to the replacement actuator. After installation, cycle the ignition and HVAC controls to allow the system to relearn actuator position if required by the vehicle.

Quality Assurance

Dorman engineers this replacement actuator to align with original equipment fit and performance expectations for the listed applications. It is intended for direct replacement service on the specified Chevrolet Malibu, Pontiac G6, and Saturn Aura models.