RepairPal Certified shops can diagnose and repair your 2010 Hummer H3T. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, you'll want to obtain a shop manual or repair manual. That's something you'll have to buy; no one in this or similar forums can post step by step instructions.
You can try, for example, www.alldatadiy.com
Good luck!