So the defrost and front air will not blow. I checked my resistor/relay and it has power going in but not out. I went to auto part store (zone) and the one they say is the replacement doesn't look like the old one. They gave me 20013. The original had two metal pieces that stuck up which I assume are the theromstats? the new one just has a flat green board looking thing. Is that correct or do I need to go to the dealer? 2004 Yukon XL 2wd Thanks.... 7