* Incorrect installation: If the arms have been recently replaced, they might be installed incorrectly.
* Worn wiper arm pivots: The point where the arm connects to the transmission might be worn, leading to looseness and inaccurate wiping.
* Bent wiper arm: A bent arm will never wipe correctly.
Here's a breakdown of troubleshooting and what you can do:
1. Check for Correct Installation:
* If recently replaced: Refer to your repair manual or online resources specific to your year and model Montana for the correct wiper arm installation procedure. There's usually a specific orientation or a notch that needs to align. Incorrect installation is the most common cause of wiper arm issues.
2. Inspect for Wear:
* Look at the connection: Carefully examine where the wiper arm attaches to the transmission. Look for excessive play or looseness. If there's significant play, the pivot point is worn and needs repair or replacement. You'll likely need to replace the entire wiper transmission assembly, a task best left to a mechanic unless you're experienced with automotive repairs.
3. Check for Bent Arms:
* Inspect the arms themselves: Look for any bends or damage to the wiper arms. A bent arm will need to be replaced.
4. If the problem persists:
* Consult a repair manual: A Pontiac Montana repair manual specific to your year and model will provide detailed diagrams and instructions.
* Take it to a mechanic: If you're uncomfortable working on your car, or if the problem is beyond simple replacement of a worn or bent part, taking it to a mechanic is the best option. Replacing the wiper transmission mechanism is not a beginner's job.
Important Safety Note: Before working on your wipers, disconnect the negative terminal of your car battery to prevent accidental electrical shocks. Always use appropriate tools and follow safety precautions.
