HVAC Blend Door Actuator. HVAC Actuator. 2001 GMC Sierra 2500 HD Engine: 6.0L V8; Actuator; Temp Valve | Bottom;. 2001 GMC Sierra 2500 HD Engine: 6.6L V8; Actuator; Temp Valve | Bottom;. 2001 GMC Sierra 2500 HD Engine: 8.1L V8; Actuator; Temp Valve | Bottom;.
