The 1st gen myvi i am driving also blew non cold air few months ago. My problem was cooling coil leak. That has to be replaced. They also serviced the blower fan, replaced the cabin filter, changed gas. All in is RM700.

Many years ago i got the same car AC serviced because the AC was blowing foggy air instead of clean air. The AC is just averagely cold. That time they replaced a corroded pipe, a valve, clean up cabin blower, clean condenser, change compressor oil and gas. All in was RM1000.

The reason it did not breach RM1000 is because i did not change the radiator fan motor and radiator plastic housing. That was highly recommended, but i skipped it. End up 2 months later, have to pay another RM 600 just to change those when the car was over heating....

Yeah. I heard people upgrade to the bigger fan motor from newer unit. They also have a shroud that covers the compressor so engine heat will not heat up the compressor. The dryer is common problem that is not serviced. That time 10 years not serviced at all!!!! Thats why the air that blew out is foggy like smoke. I think i might service it annually or 2 years once. The last service i did was like 5 years ago. Only recently few months the coil leaked and can smell some kind of chemical smell in the cabin.