Two problems related to blower have been reported for the 2003 Chevrolet Avalanche. The most recently reported issues are listed below.
The contact owns a 2003 Chevrolet Avalanche z21. The contact stated the blower motor for the heater could not be turned off. The vehicle was taken to the dealer who performed a diagnostic test and stated the blower motor and resistor needed to be replaced. The vehicle was repaired at the owners expense for $200. The manufacturer was not notified of the failure. The failure mileage was 140,000.
Heater blower not working on first 3 settings only works on high.