Introduction
This manual provides essential instructions for the installation, operation, and maintenance of your Dorman 82589 Power Steering Reservoir Cap. This cap is designed as a direct replacement for original equipment caps, preventing fluid leaks and protecting the power steering system from contamination. Please read this manual thoroughly before installation and use.
Safety Information
Always exercise caution when working on vehicle systems. Ensure the vehicle is turned off and cooled down before attempting any maintenance. Power steering fluid can be harmful if ingested or if it comes into contact with skin or eyes. Wear appropriate personal protective equipment, including gloves and eye protection. Refer to your vehicle's service manual for specific safety procedures related to the power steering system.
Package Contents
- 1 x Dorman 82589 Power Steering Reservoir Cap
Product Overview
The Dorman 82589 Power Steering Reservoir Cap is a critical component designed to seal the power steering fluid reservoir. It features a built-in dipstick for checking fluid levels and is constructed from durable materials to ensure a long service life and leak-free performance.

Image 1: Top view of the Dorman 82589 Power Steering Cap. The cap is black with white text indicating "POWER STEERING DO NOT OVERFILL USE ONLY APPROVED FLUID". This view shows the primary labeling and the knurled edge for grip.

Image 2: Side view of the Dorman 82589 Power Steering Cap. This image highlights the integrated dipstick, which extends from the bottom of the cap and is used to measure the power steering fluid level in the reservoir.
Installation Instructions
- Vehicle Preparation: Ensure the vehicle is parked on a level surface and the engine is turned off and cooled. Open the hood to access the power steering reservoir.
- Locate Reservoir: Identify the power steering fluid reservoir. It typically has a cap similar to the Dorman 82589.
- Remove Old Cap: Carefully twist and remove the existing power steering reservoir cap. If the old cap is cracked or damaged, dispose of it properly.
- Inspect Reservoir Opening: Check the reservoir opening for any debris or damage. Clean if necessary.
- Install New Cap: Place the Dorman 82589 Power Steering Reservoir Cap onto the reservoir opening. Twist clockwise until it is securely tightened. Do not overtighten.
- Verify Fitment: Ensure the cap sits flush and forms a proper seal to prevent fluid leaks and contamination.

Image 3: Bottom view of the Dorman 82589 Power Steering Cap. This image displays the red sealing gasket and the spring mechanism, which are crucial for maintaining a tight seal and proper pressure within the power steering reservoir.
Operating Instructions (Fluid Level Check)
- Engine Off and Cool: For an accurate reading, ensure the engine is off and has cooled down.
- Remove Cap: Twist the Dorman 82589 cap counter-clockwise and remove it from the reservoir.
- Wipe Dipstick: Use a clean, lint-free cloth to wipe the dipstick clean.
- Reinsert Cap: Fully reinsert the cap into the reservoir, then remove it again.
- Check Fluid Level: Observe the fluid level on the dipstick. It should be between the "MIN" and "MAX" (or "COLD" and "HOT") marks, depending on the specific markings on your cap and vehicle's reservoir.
- Add Fluid (If Necessary): If the fluid level is low, add only the type of power steering fluid specified in your vehicle's owner's manual. Do not overfill.
- Secure Cap: Reinstall the Dorman 82589 cap by twisting it clockwise until securely tightened.
Note: The cap itself indicates "DO NOT OVERFILL USE ONLY APPROVED FLUID". Always adhere to these instructions and your vehicle manufacturer's recommendations.
Maintenance
Regularly inspect the Dorman 82589 Power Steering Reservoir Cap for signs of wear, cracks, or damage to the seal. A damaged cap can lead to fluid leaks and allow contaminants into the power steering system, potentially causing damage to other components. Replace the cap immediately if any damage is observed.
Troubleshooting
- Fluid Leakage Around Cap:
- Ensure the cap is securely tightened.
- Inspect the cap's internal seal (gasket) for damage or improper seating.
- Verify the reservoir neck is clean and free of debris.
- If the cap or seal is damaged, replace the cap.
- Difficulty Tightening Cap:
- Check for cross-threading. Remove the cap and re-align it carefully before twisting.
- Inspect the reservoir threads and the cap threads for damage.
Specifications
| Brand | Dorman |
| Model Number | 82589 |
| Material | Aluminum (internal components), Plastic (cap body) |
| Color | Black |
| Dimensions (L x W x H) | Approximately 5.5 x 3.47 x 2.3 inches |
| Item Weight | Approximately 1.6 ounces |
| OEM Part Numbers | 26000901; 26001629; 26040467; 26095323 |
| UPC | 037495002042 |
Warranty and Support
For information regarding warranty coverage or technical support, please refer to the official Dorman Products website or contact their customer service directly. Keep your purchase receipt for warranty claims.
Dorman Products Official Website: www.dormanproducts.com