1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Dorman Engine Coolant Reservoir Cap, Model 54249. This cap is designed as a direct replacement for cracked or missing original engine coolant reservoir caps in select Lexus and Toyota vehicles. Refer to the compatibility list in the specifications section to ensure this part is suitable for your vehicle.
2. Safety Information
WARNING:
- Always allow the engine to cool completely before attempting to remove the coolant reservoir cap. Hot coolant is under pressure and can cause severe burns.
- Wear appropriate personal protective equipment, including gloves and eye protection, when working with automotive fluids.
- Dispose of old coolant and parts responsibly according to local regulations.
- If you are unsure about any step, consult a qualified automotive technician.
3. Setup (Installation)
The Dorman Engine Coolant Reservoir Cap 54249 is designed for direct replacement. Follow these steps for installation:
- Preparation: Ensure the vehicle's engine is completely cool. Locate the engine coolant reservoir.
- Remove Old Cap: Carefully twist the old coolant reservoir cap counter-clockwise to remove it. If the cap is stuck or difficult to remove, apply gentle, steady pressure.
- Inspect Reservoir Neck: Visually inspect the neck of the coolant reservoir for any cracks, debris, or damage that might prevent a proper seal. Clean if necessary.
- Install New Cap: Place the Dorman 54249 replacement cap onto the reservoir neck. Align the cap properly and twist clockwise until it clicks or tightens securely. The cap should feel snug and not wobble.
- Verify Fitment: Gently attempt to twist the cap counter-clockwise without applying excessive force. It should not easily come loose.
Image 1: Top view of the Dorman Engine Coolant Reservoir Cap 54249, showing the main body and two hose connections.
Image 2: Side view of the Dorman Engine Coolant Reservoir Cap 54249, highlighting the lower stem and the two upper hose connections.
4. Operating Considerations
The coolant reservoir cap plays a crucial role in maintaining the proper pressure within your vehicle's cooling system. A properly functioning cap helps prevent coolant loss and ensures efficient engine cooling.
- After installation, monitor your coolant levels regularly, especially during the first few drives.
- Observe for any signs of coolant leaks around the cap or reservoir.
- Ensure the cap remains securely fastened during vehicle operation.
5. Maintenance
Regular inspection of your coolant reservoir cap is recommended as part of routine vehicle maintenance:
- Visual Inspection: Periodically check the cap for any visible cracks, deformities, or signs of wear.
- Seal Integrity: Ensure the rubber seal on the underside of the cap is intact and pliable. A hardened or cracked seal can lead to pressure loss.
- Hose Connections: If applicable, check the small hose connections on the cap for secure fitment and absence of leaks.
- Cleaning: Keep the cap and reservoir neck free from dirt and debris to ensure a clean sealing surface.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Cap feels loose or wobbles after installation. | Incorrect alignment; manufacturing variation; reservoir neck damage. | Re-align and re-install the cap, ensuring it clicks securely. Inspect the reservoir neck for damage. If the issue persists, verify part compatibility or consider professional inspection. |
| Coolant leak around the cap. | Cap not tightened properly; damaged cap seal; cracked reservoir neck. | Ensure the cap is fully tightened. Inspect the cap's rubber seal for damage. Check the reservoir neck for cracks. Replace components as necessary. |
| Engine overheating or low coolant warning. | Coolant system pressure loss (potentially due to cap); other cooling system issues. | Check coolant level and add coolant if low. Ensure cap is securely installed. If problems persist, this indicates a larger cooling system issue requiring professional diagnosis. |
7. Specifications
- Brand: Dorman
- Model Number: 54249
- Part Type: Engine Coolant Reservoir Cap
- Material: Metal
- Color: Black
- Dimensions (L x W x H): 16 x 13.2 x 3 cm (approx. 6.3 x 5.2 x 1.2 inches)
- Item Weight: 13.6 grams (approx. 0.48 ounces)
- OEM Part Number: 16405-50051
- Compatible Vehicles:
- Lexus GX460: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
- Lexus GX470: 2003, 2004, 2005, 2006, 2007, 2008, 2009
- Toyota 4Runner: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
- Toyota FJ Cruiser: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
8. Warranty and Support
Dorman products are manufactured to high-quality standards. This product is backed by a fitment guarantee, ensuring it is designed to directly replace the original equipment cap for specified applications.
For specific warranty details or technical support, please refer to the official Dorman website or contact their customer service directly. Keep your purchase receipt for warranty claims.
Contact Information:
- Web: www.dormanproducts.com
- Phone: Refer to Dorman's official website for regional contact numbers.
