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If I'm not mistaken it's relays and fuses for the electric cooling fans. That would be from the 05 to 06--on the NBS.What fuses actually goes here and relays
That price is insane. I bought a new one a few years ago from GM and paid around the same price as you.I paid about $25-30 for mine a couple years ago. Looks like folks are getting proud of them these days.. If you can find the part number, that would be the best way to search for one.
03-06 Chevy GMC GMT800 Truck SUV Underhood Fuse Box Housing (Base / Lid) | eBay
Engine Fuse Box Housing, Includes Base & Lid, Base Cracked Tab (marked Red). Engine Fuse Box. Important notes: Engine Fuse Box Housing, Includes Base & Lid, Base Cracked Tab (marked Red). Model: GMC YUKON XL 1500.www.ebay.com