Dorman 42370 Front Passenger Side Windshield Wiper Arm Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your Dorman 42370 Front Passenger Side Windshield Wiper Arm. This component is engineered to directly replace the original equipment wiper arm on specified vehicles, ensuring proper fit and reliable performance. It is constructed from quality materials for durability and long service life, restoring functionality that may have been lost due to wear, damage, or metal fatigue.

2. Product Overview

The Dorman 42370 is a direct replacement windshield wiper arm for the front passenger side of compatible vehicles. It includes the wiper arm and a spray nozzle, designed to integrate seamlessly with your vehicle's existing wiper system.

Figure 1: Dorman 42370 Front Passenger Side Windshield Wiper Arm

The arm features a robust design to withstand various weather conditions and ensure consistent wiper blade pressure against the windshield. Its construction aims to prevent common issues such as spring wear and metal fatigue.

Figure 2: Alternate view of the Dorman 42370 Wiper Arm

3. Vehicle Compatibility

The Dorman 42370 Front Passenger Side Windshield Wiper Arm is compatible with select Cadillac, Chevrolet, and GMC models. Please verify fitment for your specific vehicle using the manufacturer's compatibility tool or by cross-referencing the OEM part number.

Compatible Vehicles:

• Cadillac Escalade ESV: 2008, 2009, 2010, 2011, 2012, 2013, 2014
• Cadillac Escalade EXT: 2008, 2009, 2010, 2011, 2012, 2013
• Cadillac Escalade: 2008, 2009, 2010, 2011, 2012, 2013, 2014
• Chevrolet Avalanche: 2008, 2009, 2010, 2011, 2012, 2013
• Chevrolet Suburban 1500: 2008, 2009, 2010, 2011, 2012, 2013
• Chevrolet Suburban 2500: 2008, 2009, 2010, 2011, 2012, 2013
• Chevrolet Tahoe: 2008, 2009, 2010, 2011, 2012, 2013
• GMC Yukon XL 1500: 2008, 2009, 2010, 2011, 2012, 2013
• GMC Yukon XL 2500: 2008, 2009, 2010, 2011, 2012, 2013
• GMC Yukon: 2008, 2009, 2010, 2011, 2012, 2013

4. Installation Instructions

Before beginning installation, ensure the vehicle's ignition is off and the wiper system is disengaged to prevent accidental activation.

4.1. Removing the Old Wiper Arm

Some wiper arms can be particularly stubborn to remove. A specialized wiper arm removal tool (such as Dorman 49023) can simplify this process. If your wiper arm has a notch at the back, this tool can be used for leverage.

Figure 3: Wiper arm base and pivot point

1. Locate the nut securing the wiper arm to the wiper post.
2. Loosen this nut slightly to allow for movement, but do not remove it completely yet. This creates a pivot point.
3. If using a wiper arm removal tool, insert its tip into the notch at the back of the wiper arm.
4. Use the tool to apply upward pressure, leveraging against the wiper post or the loosened nut, to dislodge the arm from its tapered shaft.
5. Once the arm is loose, fully remove the nut and then the old wiper arm.

For a visual demonstration of using a wiper arm removal tool, please refer to the video below:

4.2. Installing the New Wiper Arm

Figure 4: Wiper arm blade attachment point

1. Ensure the wiper post is clean and free of debris.
2. Align the new Dorman 42370 wiper arm onto the wiper post, ensuring it is positioned correctly on the passenger side.
3. Press the arm firmly onto the post.
4. Reinstall the retaining nut and tighten it to the manufacturer's specifications. Do not overtighten.
5. Attach a compatible wiper blade to the new arm.
6. Test the wiper system to ensure proper operation and full range of motion without obstruction.

5. Operation

Once installed, the Dorman 42370 wiper arm operates automatically as part of your vehicle's windshield wiper system. Ensure a compatible wiper blade is securely attached to the arm for effective clearing of the windshield.

6. Maintenance

Regular maintenance helps prolong the life and effectiveness of your wiper arm and system:

• Inspect Regularly: Periodically check the wiper arm for any signs of damage, corrosion, or loose connections.
• Wiper Blade Replacement: Replace wiper blades every 6-12 months, or sooner if streaking, chattering, or reduced visibility occurs.
• Clean Wiper Arm: Keep the wiper arm clean from dirt, ice, and snow buildup, which can impede its movement or cause damage.
• Avoid Forcing: Do not manually bend or force the wiper arm, as this can alter its tension and affect wiping performance.

7. Troubleshooting

If you experience issues with your wiper arm, consider the following:

• Wiper Arm Not Moving: Check the electrical connections to the wiper motor and ensure the fuse for the wiper system is intact. If the arm is loose on the post, re-tighten the retaining nut.
• Poor Wiping Performance: This is often due to worn wiper blades. Replace them if necessary. Also, ensure the wiper arm is applying adequate pressure to the windshield. If the arm spring is weak, the arm may need replacement.
• Noise During Operation: Chattering or squeaking can indicate worn blades, a dirty windshield, or incorrect wiper arm tension. Clean the windshield and blades, or replace blades.

8. Specifications

9. What's in the Box

Your Dorman 42370 package includes:

• 1 x Wiper Arm
• 1 x Spray Nozzle

10. Warranty and Support

For specific warranty information regarding your Dorman 42370 Windshield Wiper Arm, please refer to the documentation included with your purchase or visit the official Dorman Products website. For technical assistance or further inquiries, contact Dorman Products customer support directly.