RepairPal Certified shops can diagnose and repair your 2001 Oldsmobile Bravada. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Check your heater hose going to and coming from the heater core. If either hose or both hoses are not hot to the touch, (with the engine at operating temprature) then youru heater core is plugged and may need to be replaced if it can't be flushed out.