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Re: 2004 Trailblazer tailgate hard to open & wont stay...
The tail gate lift assist gas cylinders are worn out, replace them, a very easy job, contact any local parts store for replacement gas springs about $30 each
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check the fuse/relay. if it is neither of these check the switch with a multimeter. If you can hear the motor trying to move the glass when you try the switch it may be the regulator needs attention. It may be the motor needs to be replaced.
check fuse and relay along with the switch first then the regulator and motor afterwards. Replacing the small electronics is obviously easier than having to open up the tailgate to check the mechanics of the winedow.
raise the tailgate, remove the screws the hold the entire cover onto the tail lamp housing to the body, pull lamp straight out replace with new one assemble in reverse order.
The door sensor needs adjusting. It may be loose.
Loosen the lock nut on the pushbutton sensor in the door frame.
Unscrew the sensor a little and re-tighten the lock nut.
You need to replace the little shock looking dealies,not sure what they are called,not expensive,dont buy from dealer,autozone should have them! and no not that hard to replace! GoodLuck!
Test the tailgate ajar switch circuit's using a wiring diagram an a volt ohm meter . Probably one of the switch needs to be replaced . Free wiring diagrams here http://www.bbbind.com/free_tsb.html
I have the same problem all the time. Dirt gets caked in mine and gets stuck. I usually just pound on it or slam it shut several times to knock the dirt loose. Be rough with it.
Probably needs new stays/supports/arms, as I think the fluid leaks out of them gradually and you can't get them refilled so far as I know. Happened to a friend's ancient Nissan Bluebird Diesel tailgate and he managed to get new stay/support/arms from a Scrapdealer at a very reasonable price. Bit of a problem fitting the new ones but managed in the end and now the tailgate stays up no problem.
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