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Rear ac not blowing on 2005 GMC Yukon XL Denali

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Rear ac not blowing but front is blowing cold air
(1) Answer
Check the pressures with a gauge set, if the system is a bit low, it will only cool the front 1/2 of the vehicle.