APPLIED VEHICLES: All with Automatic Transmission (A/T): â¢ Except Q45 (G50) with Transmission filter. â¢ See Chart B at top of page 3 for details. SERVICE INFORMATION. Whenever an automatic transmission (A/T) is repaired, overhauled, or replaced, the A/T oil cooler mounted in. the radiator must be inspected and cleaned. â¢ Metal debris and friction material, if present, can become trapped in the A/T oil cooler and may build up as. transmission fluid enters the Cooler Inlet.