Where is radiator drain 2004 GMC sierra?

The radiator drain on a 2004 GMC Sierra is located at the bottom of the radiator, typically on the driver's side. It is a small petcock or valve that can be opened to allow coolant to drain from the radiator. To access it, you may need to get under the vehicle or use a flashlight for better visibility. Always ensure the engine is cool before attempting to drain the radiator to avoid burns.