2008 Yaris ac system

[misterfly]

Hey guy, last week i have made at dealership a decontamination of the ac system and refill , the ac have worked 15 minute and now it's blow again hot air , i have call the stealership but it's charge me max 2 hour to make a new diagnostic wich it's 275 $ cad , do you have any idea what the problem can be ?

Last week he have make the refill and check for leak, i got no leak.

Thanks