ACDelco GM Original Equipment Automatic Transmission Oil Coolers are heat exchangers, and are GM-recommended replacements for your vehicle’s original components. These heat exchangers transfer heat to and from the vehicle transmission oil to the engine coolant or ambient air. This helps keep the transmission temperature within the designed operating range, which helps optimize transmission efficiency and longevity. These original equipment automatic transmission oil coolers have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.