My right rear passenger window maybe off go back up I have to manually push by hand keeps sliding down 5 inches2000 Pontiac grix?

The problem with your 2000 Pontiac Grand Prix's rear passenger window is likely due to a malfunction in the window regulator. The regulator is the mechanism that controls the up and down movement of the window. Since it's only sliding down a few inches before stopping, it suggests a partial failure, rather than a complete breakage.

Here's what could be causing it:

* Worn or broken regulator components: The most likely culprit. Over time, the plastic gears or the motor within the regulator can wear down, causing it to lose power or slip.

* Broken cable: The window is likely attached to a cable within the regulator. A broken or frayed cable will prevent proper window movement.

* Faulty motor: Less common but possible, the motor itself could be weak or failing.

* Binding mechanism: Something may be jamming the window's movement within the door track. Check for obstructions.

What you can do:

1. Inspect the window track: Carefully examine the track inside the door. Look for any debris, rust, or anything that might be preventing smooth movement. Clean the track thoroughly.

2. Check for obstructions: Make sure nothing is interfering with the window's movement.

3. Try lubricating the mechanism: Apply a silicone-based lubricant (like WD-40 Specialist Silicone Lubricant, *not* regular WD-40) to the window track and moving parts. This might temporarily improve the situation, but it's unlikely to fix a serious regulator problem.

4. Access the window regulator: This will require removing the door panel. There are many online tutorials specific to the 2000 Pontiac Grand Prix. Search for "2000 Pontiac Grand Prix rear door panel removal" on YouTube or a similar automotive website. Once the panel is off, you can visually inspect the regulator for damage.

If you find a broken regulator, cable, or motor:

* Replacement: You'll likely need to replace the entire window regulator assembly. These can be purchased online or at auto parts stores. Replacing it is a moderately challenging DIY job, requiring some mechanical aptitude and patience. Again, YouTube videos can be very helpful.

* Professional help: If you're not comfortable with DIY repairs, take your car to a mechanic.

Important Safety Note: Be extremely careful when removing the door panel and working on the window regulator. Disconnect the battery negative terminal before beginning any electrical work. Sharp edges inside the door can cause injury.