Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Well, that's not the kind of cool surprise you want from your Elantra, especially in Miami! One day it's an icebox, the next it's just blowing... well, Miami air. That's about as welcome as a warm soda on a hot day.
Since your Elantra is a 2023 model, the good news is this should absolutely be covered under your new vehicle warranty. It's great that you changed the cabin air filter – good maintenance! – but that's unlikely to be the cause of a sudden switch from cold to just plain air. That filter mainly affects airflow volume and cleanliness, not the temperature itself.
For the A/C to suddenly stop blowing cold, it could be a few things. The system might have developed a refrigerant leak, and if the refrigerant level drops too low, no more cold. It could also be that the A/C compressor isn't engaging – maybe an issue with its clutch, a fuse, a relay, or even a sensor telling it not to turn on. These modern A/C systems are pretty smart, but sometimes their smarts lead to them shutting down to protect themselves.
Given the car's age, I'd advise against trying to troubleshoot this one too deeply yourself. Your best bet is to head straight to a Hyundai dealer. They'll have the specific diagnostic tools and expertise to pinpoint the problem quickly and get it fixed under warranty, so you can get back to enjoying that cool breeze.
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