When i open the trunk part on a 2004 GMC envoy i hear a noise could it be a alarm noise or something else? what all i need to check?

SOURCE: 2004 GMC Envoy has trouble idling

Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.

SOURCE: ticking noise coming from my 2004 envoy

like ticking while idling try unplugging eletric fan clutch harness to see if it goes away if it does replace fan clutch and its called a viscuss clutch fan.

SOURCE: battery removal on a 2004 GMC Envoy

The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one. 

SOURCE: cd not ajection

I have the same problem. What I did to fix it, as I dont want to pay for a new one, is use a slotted screwdriver. if you insert it in the player you will notice to little tabs that are present and up, one on the left and one on the right. You can use your screwdriver to push the tab down and then hit the eject button. It will now eject the CD. Not sure why it does this, but none the less I found this to work 100% of the time.

SOURCE: 2004 GMC Envoy rear hatch complete door wont

door lock actuator solenoid ( inside of door) needs to be replaced