Picked up the vehicle at the dealer today and asked them to re-print my service orders so I was sure I had all of them; while they printed I read the latest order and saw the dreaded "tech couldn't replicate issue." Not only that, but the tech added that the air-con was blowing cold within Mazda's specifications. BS.
When I dropped the vehicle off, the service rep checked the air con and noticed herself that any temp above 64 degrees blew hot air, but she wasn't there to confirm. I nearly lost my #$^@ but calmed down and drove home, turning on the air halfway there to allow it time to cool the cabin.
At home, I gathered two different instant-read thermometers and measure the air at the vents, and making a video of the procedure. They registered anywhere between 98 and 111 degrees; I was literally and figuratively steaming and went inside to call Mazda, being cut off twice and then waiting over a half-hour before hanging up myself. Finally getting through, I explained the issue in full and tried to send the video to the rep but my phone said the file was too large, which I doubt, but the rep said she didn't need it. I got another case number and will try to send the video another way.
Then I called my dealership and detailed what I had done with the thermometers and said I would bring the vehicle back in after the holidays and show him the video; I was informed that they wouldn't use it as the tech would have to replicate the issue; I said I would demonstrate the issue to tech myself using my equipment, which I had just calibrated the day before. One was spot on at 212 degrees in boiling water, the other 211.5, so I know their accuracy, The rep I talked to said okay, but sounded disinterested.
We'll see.