[GM-power]

Just like any vehicle they have there share of issues. The dashes do seem to have a cracking issue on the earlier models. On the defrost I'm not sure, alot if the connectors seem to break off of the glass with the opening and closing of the glass. Do you know what evaporated code you have? Sounds like you need a evap vent solenoid, the ac delco ones have a updated design and require a jumper harness when installed. When it comes to fuel system OE parts are worth the extra $$. If you can pull codes out post up what you got. Hope this helps.