This morning there was a lot of condensation on my rear window and when I tried to defrost it, only the top 3 lines of my defroster grid were working. This is a problem that I have had for a long time and I have finally decided to take care of it. Is there any way to repair the grid lines without haveing to replace the entire piece of glass?

 

Yeah, there are kits you can get for repairing the grid lines. You should be able to find them at most auto parts stores.