Where is the heater relay fuse on a 2001 gmc sonoma?

The heater relay fuse on a 2001 GMC Sonoma is typically located in the underhood fuse box. To find it, open the hood and look for a rectangular black box near the battery. Inside the fuse box cover, there should be a diagram indicating the location of the heater relay fuse, which is usually labeled. If you're having difficulty locating it, consult the owner's manual for detailed information.