The image we see below is the underhood fuse block diagram for the 2008 Chevrolet Avalanche. The underhood fuse block is located in the engine compartment, on the driver side of the vehicle. Lift the cover for access to the fuse/relay block. Here we can see list of fuses along with their usages. Some of the usages of the fuses are for air conditioning compressor, vehicle backup lamps, engine control, oxygen sensors, climate control, etc. There are 56 numbers of fuses used here. There are also the J-Case fuses like cooling fan 1, starter, antilock brake system 1, etc. We can also see the list of relays and their usages. Click on image to view it larger in a new tab.