Chevrolet Avalanche, GMT940 (USA / CAN)

Additional Notes

• All six configurations of the Chevrolet Avalanche GMT940 share an identical cooling system capacity of 15.9 liters, regardless of drivetrain layout or flex fuel capability.
• A 15.9-liter figure represents a full cooling system service fill, accounting for the radiator, engine block passages, heater core, and associated hoses rather than a partial drain-and-fill volume.
• The coolant change interval across all configurations is 150,000 miles or 60 months under normal use conditions, whichever comes first. The 60-month ceiling means a vehicle driven well under average annual mileage still reaches a change point at the five-year mark.
• The 2007-2010 model years cover four configurations: the base 5.3 V8, the AWD variant, the Flex Fuel variant, and the AWD Flex Fuel variant. All four carry the same 15.9-liter capacity and the same 150,000-mile/60-month change interval with no separate check interval listed.
• The 2011-2013 5.3 V8 Flex Fuel 2WD configuration adds a 12-month coolant check interval alongside the standard 150,000-mile/60-month change interval. A periodic check interval at 12 months typically involves inspecting freeze point, pH, and additive concentration without necessarily draining the system.
• The 2011-2013 5.3 V8 Flex Fuel 4WD configuration does not carry the same 12-month check interval listed for the 2WD counterpart, making the two 2011-2013 entries distinct in their service schedules despite sharing the same capacity and change interval.
• The drivetrain designation shifts in naming convention between the two model year groups. The 2007-2010 entries use "AWD" to denote all-wheel drive, while the 2011-2013 entries use "2WD" and "4WD," reflecting a change in how the configurations were classified across the production span.