The air blows cold, and then hot.
If your AC is blowing cold normally, then starts going warm, it is usually an indication of the system having an electrical problem with the low pressure switch, or the AC compressor relay is not making contact to engage the compressor. On some vehicles, the compressor coil is known to not be able to engage the clutch due to the clutch air gap being too large, or the coil becoming weak when it gets hot. These are all pretty common and would require further diagnosis. I recommend having a mechanic, like one from YourMechanic, inspect your entire AC system to see which of these components has failed.
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