I have a 2003 GMC Sonoma 4wd with 4.3L V6. The heater mode on my heater

slimjimmybangbang

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control doesn't work properly? There's always air coming out of the upper vents right into my face when it's supposed to go somewhere else. I've been reading a lot about it and the only thing I can check for is the vacuum leak since if it's not, then it would be the control unit itself and I have no problem replacing it myself. I have no idea where to start looking for the leak. Please help me. I am no mr.goodwrench, but I can certainly follow directions. I don't want to just start taking things apart not knowing what they are. Thanks in advance.
 
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