My Latio is about 5 years old..
felt that aircon was not that cold as before...
on saturday I sent my girl to church at Paya lebar and felt that the aircon was blowing HOT air.
I sent it to Ubi and found that the radiator top was leaking...
Was told that this is a common problem - due to wear and tear - of 5 year old car...
changed the top ($230) and now ok...
Last time dun't face this problem because we have already changed the car by 5 years old... haha...
PLEASE check if your radiator leaks or not...
check the water level every morning - if there is a drop - check...