2001 Chevy Blazer overheating?

I have a 2001 Chevy Blazer and it keeps overheating. It has coolant in it and I checked to see if the fan was working and it is. I changed the fuse. Nothing seems to be working. It only blows out cold air even when on the hot temp setting. I had the thermostat changed two years ago. I don't know what could be wrong. Anyone have any ideas?
 
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