SOLVED: 2004 silverado ac heater problem - Fixya
https://www.fixya.com/cars/t1462356-2004_silverado_ac_heater_problem
Dec 30, 2008 · 2004 2500 6.0 Silverado ac blows HOT on alternate sides of vehicle while in Auto A/C mode. Douglass, Your A/C may have lost it's programming, blend door actuator could be faulty or A/C could be low on refrigerant. You may have to take in and have a good Tech. diagnose and estimate repair.
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