Features: Low noise High efficient heat transfer, good temperature control compact structure, light and economical Manufactured to high quality control standards Note: Tighten the rotary cover and leave your vehicle idling for 10-20 minutes after installing the product on your vehicle and adding the coolant. When the coolant is completely cooling, open the cover and fill the product with coolant. Please make sure there is no gas in the product. Before you start up your vehicle, please make sure there is coolant in the radiator. Professional installation is highly recommended .