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.
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.