HVAC Blend Door Actuator. HVAC Actuator. 2001 Chevrolet Silverado 3500 6.0L V8; Actuator; Temp Valve | Bottom;. 2001 Chevrolet Silverado 3500 6.6L V8; Actuator; Temp Valve | Bottom;. 2001 Chevrolet Silverado 3500 8.1L V8; Actuator; Temp Valve | Bottom;.