Radiator Fan Assembly (CH3115169) by Replace®. A properly functioning cooling fan is critical to your engine's lifespan and performance. Modern engines operate at very high temperatures to meet emissions regulations, and the range between normal operating temperature and overheating is not very great. Should your fan fail to come on, your engine could suffer severe damage in a very short time. Don't pay the high dealer price if your radiator fan is faulty, not when you can get an OE quality replacement at a great value from Replace.