03 silverado 4x4 5.3L A/c
The little snow flake you speak of,is what we used to call max air.This actually closes the vent to the out side,and recirculates the inside air.This is supposed to make it colder.The problem with the air system,that you are having is,the actuator motor for the directional door in the vent box,and the temp door,This would be a good job,all these door actuator motors are hard to get to.If the ac line going into the firewall is cold while this is happening,then it is the actuator motors that have gone bad.This would be the large ac line,low side,the one going into the cab,from the engine compartment.If the ac line(large,low side)is sweating,and it is not cold,you have a problem.Check it and see.When this happens,it usally means that there is air in the ac system.If the ac was evacuated and charged with a recovery machine,this was the problem.The machine is faulty,and is not recharging with 134a freon,but mostly air.This happens sometimes when the straw in the freon tank has fell off in the tank,or the valves in the recovery tank are not shuting off all the way.Air condition is my certification,I know ac on automotive,And I have had this problem before,numerous times.I hope this has help somewhat,if so,please let us know,thank you.