Why does my 2007 Cadillac DTS overheating when I Drive it but not when I let it idle

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If your car overheats while driving but not at idle, even after replacing several parts, it might be an airflow or pressure issue. Check that the radiator fans run at full speed when the engine is hot. A clogged radiator or a small head gasket leak could also be the culprit. Make sure nothing is blocking airflow to the radiator. If the problem persists, a professional pressure test might be needed. If you need more advice, have other questions, or need to find a certified repair shop in your area, just let me know! Call us at 877-913-1554, and we'll gladly find you a certified RepairPal shop in your area!