2001 Gmc Yukon Two Days Ago Heater Ac Will Only Blow Out Through Defrost Vents

2001 GMC YUKON
187,000 MILES
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Two days ago my heater or ac will only blow out through the defrost vents. Rear air blows correctly. Cannot find diagram of vacuum hoses.
Jan 4, 2013 at 1:17 PM
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