TTMBCLS

I am in the process of taking in my car for a heater core and evaporator core replacement. My car curently smells right when i turn on the heater. It also smells when i leave my windows up overnight with the weather at 80 degrees. Before that my ac smelled and i had it sprayed .. Well now its been a year and tired of it. I only have 75000 miles and i need to fix it. Too bad.