The AC Delco 15-74349 HVAC Blend Door Actuator is designed for specific GM vehicles like Silverado and Yukon, with a bolt-on mounting style for easy installation on the dashboard. Made of durable plastic and metal materials, this actuator features 5 terminals and has been tested for durability. It does not require any drilling or modifications for installation and is manufactured in Korea. This HVAC vent actuator is designed to control the blend of hot and cold air in the vehicle's heating and air conditioning system, ensuring optimal climate control for the driver and passengers.