RepairPal Certified shops can diagnose and repair your 2004 Chevrolet Silverado 2500 HD. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Temp control mode door motors are the commom problem. Electronicly controlled system can be diagnosed with compatable scan tool. It likey has fault codes set in system to help determine witch door motor is failing.