Where do you find the fan relay switch on a 2004 Blazer?

On a 2004 Chevrolet Blazer, the fan relay switch is typically located in the under-hood fuse and relay box, which is situated near the front of the engine compartment. You can identify the relay by consulting the diagram on the inside of the fuse box cover, which will indicate the position of the cooling fan relay. If you're having trouble locating it, refer to the vehicle's service manual for detailed information.