The AC may stop working due to a refrigerant leak from the condenser. GM has developed and updated condenser and mounting bracket to help prevent the replacement condenser from failing in the same manner.Google+
Car Problem Reports
Pontiac Aztek AC Condenser May Develop Refrigerant Leaks
Pontiac Aztek Problem
Average Mileage: 103,000 mi (50,000 mi - 190,000 mi)
Visitor, 2001 Pontiac Aztek, 76,000 mi
Fan, etc still blows fine, all vents, but no cold air. Shop did a diagnostic on it and said "hole or puncture in condenser. Approx. $1,200-$1,300 --- new condenser $360-460....labor intensive.
a/c quit working, replaced the condenser and dryer. it had a crack in the weld on the lower pass side bracket. new one had no bolt hole in this tab.