Seems like majority of GSRian having this problem...
Don worry, is not a big deal anyway...the factor tat causes the scenario which Lazy_Chai stated is because of your aircon fuse that control your aircon fans to work has burned out...
Dunno if this applied to u guys or not, but it's applied to my case..When u just change a new fuse, either 15-30, once engine on, aircon on, within 1 minutes the fuse will smoke and u can see melting process to the fuse...
wat my mech do is change to 40, and it seems fine until now (10days)...
thanks wei ck!ya it was the fuse!it melt...use 40?is it ok?i realize most gsr face the same prob!my frens also the same