Good morning, I have a 2003 Envoy and I tried turning the heat on one day, the levels 1, 2, 3 and 5 didnt work so I turned the heat up to level 4. It was working fine for about 5 days, and than 4 stopped working on me. So the heat nor the defroster is not blowing out anything. I still have heat in the rear of the envoy, So I turned the rare levels to R and it worked until this morning, even thou the r is not working, 1,2, and 3 is still blowing out heat. Can you please tell me whats going on before I spend the little money I do have trying to fix somthing that might just need a fuse. Auto zone told me I only needed this part that cost 39.99 because the controls were wearing out. But another person told me it would cost 250 just for the part I needed to get it fixed.. Im really confused can someone help me. thank you
