For what it's worth, after 6 years and about 70k miles my E46 began blowing warm air/cool (but not cold) air from different vents. Multiple leaks were repaired ($1000+) and the system was fine for four more years at which point the symptoms returned. I went to a local mechanic who found the sytem to be very slightly below optimum charge. After a re-charge (total cost $100), it again blew cold air until traded a year later.
So I suspect AWCoupe should be OK for awhile.