Chevrolet Blazer loud fan continues running for 5 minutes after shutdown and AC fails during this issue on Chevrolet Blazer

Some Chevrolet Blazer owners report experiencing issues with the fan running loudly for several minutes after shutdown, often accompanied by AC failure. This phenomenon may occur after long drives as the engine cools down, but if the fan continues to operate for an extended period, it could signal a fault with the fan relay or the Engine Control Unit (ECU). Potential causes include a defective fan relay, faulty PCM or ECU, or electrical wiring complications. Additionally, low coolant levels or leaks can lead to the engine fan running post-ignition. Owners are advised to investigate problems with the fan relay, temperature sensor, or cooling system if the fan persists after turning off the ignition. In some cases, an incorrectly reading engine coolant temperature sensor may prompt the computer to activate the fans as a safety precaution. It is recommended that affected owners have their vehicles inspected by a qualified mechanic for proper diagnosis and resolution.