No Heat

When I put on the heat or defroster all that comes out is cold air. Is this a fuse or something more expensive? Thanks for any info.

First check your coolant level. It's more than likly the thermostat. If it's sticking open it can cause that problem. Try replacing that and if that doesn't do it then look to the heating core. If your unsure what those items are and how to change them, go to autozone and get yourself a haynes manuel. A theromstat will cost around 5 dollars, a gasket for it about 1 dollar and a tube of rtv a few dollars.