GMC 2001 Envoy - Manual (Page 373)

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Engine Compartment Fuse Block The fuse block is located under the hood at the
driver’s side of the engine compartment. See “Engine
Compartment Overview” in the Index for more
information on location. Before using this fuse block
picture and chart, check to see that it matches the fuse
block in your vehicle. If the fuse block pictured here is
different than your vehicle’s, use the fuse block picture
and chart located later in this section.
Remove the cover by turning the fastener
counterclockwise. To reinstall the fuse panel cover,
push in and turn the fastener clockwise.