Let me start by saying I have already done a search of the forum and didn't find any answers that pertain to my problem

I have a 2002 Grand prix Gt

The hud works intermittently with no pattern to when, or for how long it works. I can be driving down a straight smooth road or sitting still and it can come and go. sometimes it will work for a short period othertimes it works a long time

when it does work I can adjust it up and down so i don't believe its the issue that i read a lot of the 2004's are having with the spring.

The readouts all work properly when the unit does work.