Chevy & GMC Vans

Can somone please direct me as to which fuse is for the heater blower? Is it specific or is it shared with another component? Is it under dash or under hood? Heat works but blower stopped working during -40C temperatures. Doesn't work on low, med or high. Would like to start with fuse first before moving to next possible issue. Thanks.

If you look under the hood at the fuse box cover, you will see them all labelled as well as being spelled out in the owners manual. I don't recall off the top of my head which one it is.