air conditioning problem

We have a ducted evap. air conditioning system. The air coming through the ducts are much warmer than usual. It appears as a guess that the air is not being pushed through the water, yet, water is being pumped into it on the roof & the water is released when I turn it off.

Any ideas from any air conditioner specialists?

Hot day in Perth today and it's 31.5 inside and pretty uncomfortable - when I have it on and it's so hot it tends to go to a max temp of around 26.5/27. It's on now and the air appears pretty warm.

Probably needs a service, or worse?.

The brand is Comfort Freeze - and it's perhaps 12 years old.

Thanks