No complaints here, made it through the Sydney summer without any noteable issues, and I had the car parked in full sun on many occasions. I do have very dark window tinting though, which helps keep cabin temps down a little in the first place (well, depending which way the car is parked). It's certainly not the strongest air conditioner I've had in a car, but it's far from the worst and definitely good enough that I hadn't even given it any thought until reading about other peoples apparent issues.