The Genuine Honda OEM Radiator Cap (19045-RAA-003) is a factory replacement cooling system component designed to maintain proper pressure within your Honda's cooling system. Manufactured to Honda's original equipment specifications, this Denso-style radiator cap helps regulate cooling system pressure, prevent coolant loss, and maintain consistent engine operating temperatures.

A properly functioning radiator cap is essential for maintaining cooling system efficiency. Over time, the cap's internal spring and rubber seals can deteriorate, potentially causing coolant leaks, overheating, or inconsistent cooling system pressure. Replacing a worn or damaged radiator cap with a Genuine Honda OEM component helps restore reliable cooling system performance.

Whether you're performing routine maintenance, replacing a failed radiator cap, or refreshing your Honda's cooling system, Honda part number 19045-RAA-003 provides factory-quality fitment and dependable operation.

Features

• Genuine Honda OEM Part: Manufactured to Honda's original equipment quality and performance standards.

• Denso-Style Construction: Factory-style design for reliable cooling system operation.

• Pressure Regulation: Helps maintain proper cooling system pressure to prevent premature coolant boiling.

• Durable Sealing Components: Designed to provide a secure seal against the radiator filler neck.

• Cooling System Protection: Helps reduce coolant loss and maintain consistent engine temperatures.

• Direct OEM Replacement: Designed for compatible Honda radiator filler necks without modification.

• Long-Term Reliability: Ideal for routine maintenance, cooling system repairs, and OEM restorations.

Popular Performance Applications

• OEM Cooling System Maintenance: Replace aging or damaged radiator caps to restore proper cooling system pressure.

• K-Series Engine Maintenance: Suitable for compatible K-series-powered Honda applications using the appropriate factory radiator filler neck.

• K-Series Engine Swaps: An OEM replacement option for custom cooling systems utilizing a compatible Honda radiator neck.

• Daily Driven Performance Vehicles: Helps maintain dependable cooling system operation during everyday driving.

• Cooling System Restoration: Ideal when replacing radiators, coolant hoses, thermostats, or other cooling system components.

Additional Information

• Manufacturer: Honda
• Manufacturer Part Number: 19045-RAA-003
• Product Type: Radiator Cap
• Construction: Denso-Style OEM Design
• Application: Honda Cooling Systems
• Installation Location: Radiator Filler Neck or Compatible Pressurized Coolant Filler Neck
• Fitment Type: Direct OEM Replacement for Compatible Applications
• Quantity: 1 Radiator Cap

Note: Verify compatibility with your vehicle's radiator and cooling system before purchasing. Aftermarket radiators and K-series engine swaps may require a different radiator cap depending on filler neck design and pressure requirements.

Common Reasons for Replacement

• Coolant Leaks: Worn or damaged radiator cap seals can allow coolant to escape.

• Engine Overheating: A radiator cap that cannot maintain proper pressure may contribute to overheating.

• Loss of Cooling System Pressure: A weakened internal spring can prevent the cooling system from maintaining its intended operating pressure.

• Coolant Overflow Issues: A malfunctioning cap may cause coolant to enter the overflow reservoir improperly or prevent proper coolant return.

• Damaged Rubber Seals: Heat cycling and age can cause the sealing surfaces to harden, crack, or deteriorate.

• Preventative Maintenance: Replacing an aging radiator cap during cooling system service helps maintain reliable operation.

Installation Notes

1. Allow Engine to Cool: Never remove the radiator cap while the engine is hot or the cooling system is pressurized.

2. Remove Existing Cap: Carefully remove the original radiator cap once the engine and cooling system have completely cooled.

3. Inspect Filler Neck: Check the radiator filler neck for corrosion, damage, or debris that could interfere with proper sealing.

4. Verify Compatibility: Confirm that the replacement radiator cap matches the radiator filler neck and required pressure specifications.

5. Install New Cap: Position the Genuine Honda radiator cap onto the filler neck and rotate until fully secured.

6. Check Coolant Level: Inspect the radiator and coolant overflow reservoir, adding the manufacturer-recommended coolant mixture if necessary.

7. Inspect for Leaks: After installation, bring the engine to normal operating temperature and inspect the cooling system for leaks or abnormal operation.

What's Included

• (1) Genuine Honda OEM Denso-Style Radiator Cap – 19045-RAA-003

Maintain reliable cooling system performance with the Genuine Honda OEM Radiator Cap (19045-RAA-003). Designed to deliver factory-quality fitment, dependable pressure regulation, and long-lasting performance, this OEM replacement is an excellent choice for keeping your Honda's cooling system operating as intended.