RE celd15b's problem about the grinding noise, I think I have a similar experience a few months back. It got so loud & irritating pero ok naman lamig nung aircon. My carnival's 01 model A/T
Na trace namin that the sound came from the fan or blower located out front under the right side (passenger) of the dashboard. I had it replaced kaya nawala pero bumalik after more than a month. Pinadala ko sa gumagawa ng aircon, they fixed something & it turns out na baka 'di pala sira yung pinalitan kung blower (really sucks). I can't tell you what they fixed, itanong ko sa driver (kaso makakalimutin din yun), i post ko if he remembers. My supposed busted blower worked well when it was tested outside (that should've been the signal that something else was busted) pero nag iingay pag binalik. For the meantime, have that blower checked & the aircon na rin.