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Wassup I got a 2004 gmc sierra 1500 5.3 when I'm using the ac all speeds work fine heater and ac works fine but when I turn it down to 0 and go on freeway air starts to blow thru the vents not ac or hot just air like I left it on speeds 1-3 completely turns off fine when truck is turned off also same happens sometimes just on the streets. Any info would be much appreciated thank you.
 

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I dont think its the blower. Its outside air via the cowl. Put in on recirc before turning it to 0 and see if it stops.
 
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