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To access the air pump relay, start by opening the driver's side door to find the hood release lever. Once you locate it, go outside the vehicle, lift the hood, and release the safety latch with your other hand. After you have the hood open, disconnect the battery to prevent any accidents while replacing the relay. The fuse box, covered in black, can be found just beyond the battery. Removing the cover will reveal the location of all the relays.
The air pump relay for a 2004 GMC Envoy can be found within the primary fuse box situated under the hood.