My 2001 jettas hood will not open. i pulled the hood release inside of my car to open my hood. the piece that pops out from the under the hood came out but when i tried to pull that to entirely open the hood, my hood would not release for that to open.

Cable is stretched/sprung. Access hood release panel and pull cable with channel locks.. or worse, something is stuck in the latch mechanism under hood.
See repair rep at Ford in any case.

I don't think there is a day that goes by in the shop where we don't get at least one vehicle that is doing this. Just use two people. One to pull the cable release and the other to slap the hood with their hand and tell it to cooperate. Usually, just a little "jarring" with the cable pulled will get it to pop up.

1. Locate the interior hood-release lever under the dashboard on the driver's side of the interior of the car.
   

2. 2

   Lift up and toward you on the hood release lever. The lever is connected to a cable that releases the hood. The hood will pop up about 1/2 inch when you pull the lever.
   

3. 3

   Move to the front of the car and locate the exterior hood-release lever under the front of the hood. It is located near the middle of the vehicle, just beyond where the front edge of the hood meets the body. Lift up on the inner lever.
   

4. 4

   Lift up on the edge of the hood while holding the inner lever in place. When the hood is up, find the hood prop and raise it, setting its tip in the hood-prop mount on the hood, to hold the hood up while you work in the engine bay.
   

Read more: How to Open the Hood on a Mitsubishi Endeavor ' eHow.com http://www.ehow.com/how_6301122_open-hood-mitsubishi-endeavor.html#ixzz16Ou5FhQF

you will have to pop the mechanism open from under the car this may be a little difficult you will need a very long screw driver or a pry bar and hopefully you be able to see the latch from under the car.if you can then reach up and manually release the latch once open you will have to replace your cable or the cable tie down which ever is bad. if not you will have to make a new release that you can use on the outside of the car.

They are not designed to open from the outside. Why can't you get inside?

So I gather that the release inside the car has release the hood's primary catch, but the T handle is not release the secondary catch to allow the hood to fully open.

If this is the case, take some lithium grease or WD-40 (lithium grease is much better and lasts much longer) and spray it onto the catch assembly.

Try pulling on the T handle some more after a few minutes of the grease soaking in and see of that releases.

If that doesn't work, then take a long flat screw driver and press it against the catch gently hit the screw driver with a hammer (you should be trying to push the catch towards the driver's side of the car)
You may need someone to be pulling on the T handle as you hit the catch with a hammer. I actually had to do this with a jetta before....

You can pop out the intake plastic grid and access the hood lock mechanism from there

There's a hood release lever inside your Jetta by your left knee. Pull this lever to partially release the hood. Then reach your hand under the front center portion of your hood to locate the external hood release lever. pull on this lever to fully release the hood. Two (2) separate hood release levers in two different locations.

on the left side of the drivers side their is a panel with the hood release Pull off the cover of the hood release and you will see a cable connected to the hood release. take some pliers and give it a good pull.
if you dont hear a click, have someone pull the hood up while you pull on the hood release cable. next their will be little space to take off the grille for easier acces. take off the grille carefully by prying it off carefully on each side. push the grill up and pull it towards you going up then down.
Now all you have to do is stick a flathead screwdriver or philips. and on the bottom of the hood release on the hood stick the screwdriver under the release and push the screw driver down while pushing the hood up.

The hood release is inside the car, on the drivers side, under the dash, far left side,and the latch release is inside your grill, near the center