MOST LIKELY THE BLOWER MOTOR RESISTOR HAS GONE BAD. RUN DIRECT PWR TO BLOWER MOTOR AND SEE IF IT WORKS TO START WITH. IF IT WORKS REPL BLOWER MOTOR RESISTOR. THEY ARE CHEAP LIKE 25.00 AND YOU CAN INSTALL YOURSELF. ITS LOCATED UNDER GLOVE BOX ONN THE OUTSIDE OF HEATER CASE IT HAS LIKE 4 WIRES GOING TO IT
RepairPal Certified shops can diagnose and repair your 2006 Hummer H3. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.