This could be one of many problems so it's probably best checked by someone with the correct tools and knowledge.
That being said,
With your engine cold, open your hood and start your car. Check to see if your cooling fan is engaged, take note of its speed if it is. Then turn on your AC and listen for the compressor clutch to engage. once you hear it, check to see that your cooling fan is blowing, if it wasn't before. The fan should be on and in high speed whenever your AC is on, whether the engine is hot or not. If it is not, then the reason for losing cold air is that, due to the lack of being properly cooled, your freon pressure is getting too high and is causing the compressor to turn off.
If the fan is blowing as it should be, you may have a faulty compressor or the clutch on it may need to be shimmed.
Another culprit could be that your system is low on freon or the switch that senses the pressure is faulty.
And yet another culprit could be a faulty relay that is overheating and shorting out.
Sorry I couldn't give you a difinitive answer as to what the problem is, but without diagnosing it myself, this is the best I give you.
Good luck!!
I am having a similar problem and came across your solution. Is my case, the fan is not running either when the car first starts nor when I turn on the AC. The clutch does engage however. After 5-10 minutes the clutch disengages and will not reingage until I turn off the engine and let the engine cool. I have driven considerable distances and the engine does not overheat. Any idea of what needs fixing? Thanks for any help you can offer
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