1999 Cadillac Deville

1999 Cadillac Deville. Engine gets hot, doesn't leak coolant or oil, engine oil is not milky or creamy. Could be a thermostat I'm not too sure but just bought a new car so need to get rid of this one. front windshield crack and ac doesn't blow cold air. Asking $600 OBO I do not have a vehicle report or history, vehicle is as is but anyone is able to check it out for themselves and do what they must before purchasing. Thank you