just to share: my aircon was quite erratic at times, with setting of 23oC, sometimes ok sometimes not, even during cool weather. found out that my compressor was running in & out quite frequently recently (about 1 time per minute), so during my 5k servicing this monday, i told the service advisor, and after that, my aircon now is running better, temp set at 25oC now also no problem. dunno wat they did, sure fix the problem. maybe car will run more efficient too?
