Where is the temperature door actuator for driver side located, specifically? on 2007 Chevrolet Tahoe

When I turn the heat all the way up(90), on both sides of dual climate control system, passenger side blows hot air, driver side blows cold. Apparently this is common, and parts are cheap. I don't want to spend $400 on a $40 job I could do myself.

Asked by for the 2007 Chevrolet Tahoe
agree with #1 and the blend door motors are approx 275.00 just for the part
1 more answer
it should be under the dash on the right side but I wouldnt try changing it unless you know what you are doing