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Heat I am cold man!

I have a 2000 LS but has a 2003 v8 engine. My problem is that my heat is not working. The previous owner replaced thermostat from a 200 to a 180 degree thermostat. He said that the heat will run you out. Well this morning I drove for 45 minutes and I was warmer with the unit off but had hard time seeing because of fogged windows. I can set it on 90 and it never blows hot air but not cold either. The AC is operational.

Any ideas on where I need to begin to trouble shoot?
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