How do I install a rear wiper motor on 2003 Pontiac Montana?

Just replace the wiper arm. Remove the nut and check the the splines on the shaft are okay?

How To Install Replace Wiper Motor Arm Chevy Venture Pontiac Montana 97...

I'm not sure if this video does apply to the 2003. All the linkage can be removed from under the cowl.

You might want to check this video.

1. Release the old blade. Lift the wiper arm off the window.
2. Remove the wiper. Once rotated, the wiper will release from the wiper arm with a gentle click.
3. Position the new blade. Place the small bar attachment on the new wiper blade into the hook on the wiper arm.
4. Lock the blade into place. ...
5. Done!

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How to change the rear wiper on a 2003 Pontiac Vibe

one of two possible problems.. (trusting fuse is ok) first is that the wires in the hinge area are prone to breakage. second is that the rear wipers are subject to vast amounts of dirt/salt the shaft of the wiper can leak into the bearings and seize them solid. i would remove the plastic tailgate cover and meter the wires off the wiper and if there is power then you are looking at the motor. hope this helps

Wiper shaft is stuck by rust (aluminium oxide). Remove wiper motor. Knock out wiper shaft with soft hammer. Clean shaft hole with similar size drill bit.

Wiper shaft is stuck by rust (aluminium oxide). Remove wiper motor. Knock out wiper shaft with soft hammer. Clean shaft hole with similar size drill bit. Remove screws holding handle and other panel screws and pull on panel (it is held by metal clips).

Normally just check real close for hidden screws behind any handle at ends, all around outside of panel, if carpet, at bottom area, feel for possible hidden screws beneath carpet, the the rest should be pull clips, that release as you pull on the panel. Sometimes it will scare you into thinking something going to break & if so, look again for screws. Usually quick pull works best. try to do it when warm, so panel is less likely to crack.

When you purchase a wiper blade, the step-by-step instructions are included in the package. It will be a matter of carefully pulling up and out, then reverse the steps to install.