(03 Aug 2014, 8:52 am)Roland Pratt wrote Ah right that explains it. Didn't realise you had opening windows with aircon!
Just as a side, in these days of saving money and reducing fuel consumption - it may be that the drivers deliberately don't put the aircon on.
Not sure who does/doesn't these days - but a lot of operators have incentives for drivers who drive in an economical manner.
It doesn't take a genius to realise that the chances of having a decent record is reduced drastically when the aircon is being used.
Or, it could have been broken ;p