hey guys my brothers got a 2001 yukon xl my problem is the front ac control the air bloes hot no matter where i put the temp knob . the rear ac works perfect . so im figuring the ac itsefl is fine . from my own knownledge and from what i have read it can be the actuator the ontrols the hot and cold door .does that seem correct ? my other question is where is this actuator so i can check it? i bought the haynes auto repair manual and it doesnt show where it is . and lastly if there is something else i can check please let me know .i would like to do all i can before i resort to going to the dealer . thank you :hlp: