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				A/C blowing warm air suddenly
			 
 
			
			2005 X5 3.0i sport 117k miles
 Going to work this morning it was blowing icy cold air to a point I got cold.  Coming home I hear sorta hissing sound from the vent then it started blowing warm air as it's 90 degrees outside.  I've never had an A/C issue during the 10+ yrs I owned this car.
 
 What's the first thing I should check?  I opened the hood but don't see anything unusual.
 
 Sorry, I should search for old posts but I'm posting using my phone and the internet's very spotty as I'm on the road currently.
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