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After you pop the window either with your remote or the button on the dash you can use a very big screwdriver to open the gate. I found a replacement knob for my tailgate with keys at www.rockauto.com, they were very reasonably priced and quick and easy to change out.
It is the actuator, look this up on Blazer forum, someone will tell you step by step how to fix it!! You will have to loosen the inner panel and get your hand in there and find the proper linkage to pull on.
Don't know if this will help, but I had the same trouble with my 2002 and my mechanic had to take apart inside panel on back tailgate and there was a switch in their that had broken. The part was just as expensive as the labor and it was quite a task.
remove the panel from the inside of the rear hatch door and check to make sure the latch mechenism is secure if not push or pull the leads to open hatch door then try to reconnect them
Use a flat head screwdriver to pry open the latches
use the handle....
Most often the cause is two broken clips inside the tail gate mechanism. By pushing upwards you can remove the plastic bezel around the tailgate handle; its just snapped into place. You should now be able to see the mechanism under the handle. There are two metal bars coming in from the sides of the tailgate. These operate the latches on either side of the tailgate. They are attached to the central tailgate handle mechanism by plastic clips. One is pink and one is green; colored to indicate whether they go on the right or the left. You can get these clips from a dealership for about 5 bucks a piece. Hope that helps.
There are 3 or 4 bolts on the inside of the tail gate. Remove them and the handle should come out. It should be atached to 2 rods that go to the locking mechanism. More than likely one of the small plastic keepers has broken and the rod has come off from the handle. To open the tailgate, simply pull inward on these rods. The small plastic keepers and the plastic bezel around the handle (which is subject to breaking when removed) can be found at any parts house. The clips are usually $2 for an assortment pack and the bezel (which is subject to breaking when removed) is about $15.
If you look where the handle goes you will see 2 rods. Just squezz them together. Are use a screewdriver to pry them towards each other.
You have to take off the plastic surround around the handle for the tail gate then pull the two silver rods toward each other or toward the handle and the gate will come down. Most likely the spring has broken or the lock stop and the kit to replace the whole latch assembly is about $35.00.
put a screwdriver in the latch pull the handle and apply pressure to the screw driver should pop the latch open
These models came stock with a release button below the cigarette lighter. If you look directly to the right of the radio there should be a button to push that will release the glass and then once its open, your tailgate should open once you do it manually. Hope this helps you