Hi. I just bought a new house and the fridge was working. After I cleaned it and put my food in there it now doesn't cool. It used to suck the doors tight and it does not do that either. I lowered the temperature settings in both the fridge and the freezer and it does not do anything. It is a little cold but everything is melting. I opened the door on top and cleaned everything there. The piece that looked like a radiator was Very dirty and I vacuumed it. I was thinking that this was going to fix it and it didn't. How do I find out what is wrong with it?

Thanks so much in advance,
Roman