You recently said: "All modern car ventilation systems are designed to be used with the air condition system switched on permanently. Switching it off for long periods will cause the seals and joints to dry out. It will also increase the risk of the compressor seizure. Both will be costly to fix." That's certainly news to me as I've only ever used my AC system in hot weather or if the air needs refreshing. I've had many cars over the years and never had a faulty AC system. Another important reason for not using AC except when necessary is the effect its use has on fuel consumption.