5.2 LITER. Trans cooler seal. An O-ring used to prevent leaks at the automatic transmission oil cooler control valve. Automatic Transmission Oil Cooler O-Ring. Automatic Transmission Oil Cooler Seal. Automatic Transmission Oil Cooler Control Valve O - Ring. Automatic Transmission Oil Cooler O - Ring. Automatic Transmission Oil Cooler Seal. Cooling module o - ring. Seal ring. TRANSMISSION cooler seal.