RepairPal Certified shops can diagnose and repair your 2011 Cadillac Escalade EXT. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Assuming the passenger vent is properly blowing cold air then it seems like a control door in the system is stuck. We'd be happy to take a look at it for you! Call the shop, 301-662-0421