I have a 06 montana the rear wiper not working but it only works when i push on the arm so i check and tight the arm but it till doing the samething what could it be

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

remove plastic cap on right wiper arm ,there is a nut on top of it and it's not tight. Before to tight it unscrew it put some treading lock fluid and tight the nut. Or there is a linkage unhooked. if the left side working than it is not the motor or transmission

hope it helps

there is a nut that holds the wiper arm to the motor . see if it is tight

before anyone replaces the motor, check the the small arms that connect the wipers are well oiled and in full rotation. While your car is off, slowly and with little force push the wiper arms down and watch that the small outer connector arm rotates in a full circle. Have a friend grease(white) or oil with machine oil these connectors. if they move but don't fully rotate, buy and replace those before you do a new wiper motor.

It will surely be the rear wiper motor that failed. The hatch panels can be removed, lift the hatch. You'll find a torx screw where the pull handle is, remove. Pull down the lower portion of the panel, the upper is also held on by push clips, just pull it away. Lower hatch, remove wiper arm cap, and nut holding wiper arm on. take off the large nut off at the base of the wiper shaft. raise hatch, remove elctrical connector, and 3 10mm bolts holding wiper motor and bracket. Replaced and reverse procedure.

The three front ones are simple and the three back ones are challenging. There are two ways to replacing the rear spark plugs on the Montana.
1. If your arms are long enough and you have longs extensions with a spark plug socket with a swivel build in to it, you can get to the plugs from under the Montana.
2. You can get to the rear plugs buy disconnecting the two dog bone engine mounts in front of the engine and tilting the engine forward. You can do this by placing the parking brakes on and disconnecting the dog bone, once that is done. Place your foot on the brakes and take the parking brakes off and push the Montana forward till the engine tilts forward enough to give you the room you need to get your arms over the top of the engine with the extensions and spark plug socket. Make sure you place the parking brakes back on and put a block at the rear of the engine to ensure the Montana will not move back and cause you to loose your arm or head.
Note that you need to keep the transmission in park when tilting the engine and that your going to have to replace the spark plug wires and do everything by touch to replace the rear spark plugs.
Thank you for using Fixya and use platinum spark plugs to give you 100,000 miles of service. Good luck and be safe.

Front Wiper Motor Removal & Installation

NOTE A new wiper motor assembly comes with the linkage arm installed.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove the windshield wiper mounting arm and pivot shaft
   WARNING Do not remove the wiper motor linkage arm from the wiper motor assembly. If the arm is removed, the wiper arms may not park in the correct location.
   NOTE Use a suitable tool to separate the wiper linkage arm from the wiper mounting arm and pivot shaft assembly.
   
3. Remove the 3 bolts and the wiper motor.
   
   
   
   Fig. Wiper motor and linkage
   

To install:

1. Install wiper motor and bolts.
2. Tighten wiper motor bolts to 10 ft. lbs. (13 Nm).
3. Install windshield wiper mounting arm and pivot shaft.
4. Check wiper operation.

Rear Wiper Motor - Removal & Installation

1. Remove the rear pivot arm.
2. Remove the rear wiper motor shaft nut cover
3. Remove the rear wiper motor shaft nut.
4. Open the lift gate window.
5. Remove the rear wiper motor cover trim panel.
6. Disconnect the electrical connector.
7. Remove the 2 rear window wiper motor nuts
8. Remove the rear window wiper motor.
   
   
   Fig. Rear wiper motor view-2008 model shown, other years similar
   

To install:

1. Install rear wiper motor and tighten mounting nuts to 62 inch lbs. (7 Nm).
2. Reconnect the electrical connector.
3. Install wiper motor cover trim panel.
4. Install rear wiper pivot arm tighten nut to 53 inch lbs. (6 Nm).
5. Install shaft nut cover.
   
6. Check wiper operation.

Good luck (remember rated this post).

fuse or broken wire

While wipers off in parked position, remove wiper arm and re-position arm to correct stowed position.
Re-tighten any wiper arm attachment nuts/screws etc.
Check wiper attachment arm for damage or cracks at the spigot mount. Replace if damaged.

No...blade comes off end of arm... If in doubt, most "supermarket" style parts outlets will put it on for free.