2004 grand prix hud adjustment doesn't move up or down.

its a broken spring in it there is a very good guide on repairing it on this site http://www.atthetipwebs.com/technologyinstructions/hud.htm

The HUD may still be working but the spring has broken which holds the mirror to reflect the monitor image to the windscreen. Go outside the car and look straight down the HUD tunnel to see if the HUD is still on. If it is, then do a search on google for how to fix the hud. There are some very detailed instructions (with pics) to show you how to do this. Really pretty simple.

I've had to fix both of my HUDs on my two 2004 Grand Prixs. Look down low through the steering wheel to see if the display. Hopefully you can. You can also look through the windshield at th HUD unit. Look at the tension spring and see if it is loose. The problem on my cars was the spring wore through the plastic lever that controls the reflection angle of the HUD. If this is the case, you are in luck. Remove the A-pillar moldings by simply pulling them off. You must then pull up on the plastic dash molding that encases th HUD and runs the entire width of the dash. Remove the screw on the far left side of the dash by your left knee. Pull out the plastic arch molding over the instrument cluster. Unbolt the instrument cluster and pull out enough to get to the screw that holds in the HUD. (There are two screws, one in front and one on top.) Pull out the HUD and unplug. Carefully take the HUD apart. Get some good epoxy or JB weld and fix the plastic lever. You must the drill a hole for the spring or poke a hole through the epoxy as it is setting up. I let mine dry overnight before re assembling everything. The task may sound daunting, but it is not. You should be able to get the HUD out in 20-30 minutes. Hope this helps. Everyone should place sunvisors over their HUDS ALWAYS!

yes, behind the speedometer / odometer is a small bulb. replace it and it will fix your heads up display

If you peek down inside the windshield, you'll probably see the HUD is working. A common issue is that the adjustment spring will break, making the HUD invisible because it is adjusted out of range. The spring can be replaced by removing the cluster then the HUD unit.

This just happened to me and apparently is happening to everyone right about now. Solution:
http://www.atthetipwebs.com/technologyinstructions/hud.htm

http://volvoforums.com/forum/showthread.php?t=30039

http://www.grandprixforums.net/f41/problems-my-heads-up-display-04-a-12491.html

There should be a switch on the dash somewhere to adjust the position of the HUD. I'm thinking it's near the driver information center (DIC). I just worked on one of these cars a week ago and I remember seeing the switch. Just can't remember exactly where but I know it's there. Hope this helps.

I repaired one of these and created instructions. http://www.atthetipwebs.com/HUD.htm

Have you ever had the windshield replaced? Or did it just stop working out of the clear blue?

There is a spring inside the HUD and it has probably come off. The samething happened to mine. I had to take it out myself and fix it. Majorhassle. The dealer wanted over 600.00 to do the same.