What is the cruise control fuse on a chevy thirty five hundred express van

Hi - I am Dave, contributing to RepairPal and providing expert advice since 2010. What makes you think that a fuse is blown? What testing has been performed to find out what is wrong? I do not believe there is a fuse for the system itself. There are components to the system that might have circuit protection. For example, the brake light switch needs to work properly for the cruise control to work at all. Have you checked to see if brake lights work? Also, are you under 36,000 miles? The factory warranty is 3 years / 36,000 miles. If under both - see your local dealership for what would hopefully be a warranty repair.