• Honda 19045RAA003 Genuine Radiator Cap
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Honda

Honda 19045RAA003 Genuine Radiator Cap

Honda 19045RAA003 Genuine Radiator Cap

$28.12
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✔ Honda 19045RAA003 Genuine Cap, Radiator — OEM Part
✔ Fitment: 2005–2026 Honda Accord, Civic, CR-V, HR-V, Odyssey, Passport, Pilot, Ridgeline, S2000, and select Acura models
✔ Direct replacement for factory radiator cap — no modifications required
✔ Manufactured to Honda’s original specifications — maintains proper cooling system pressure
✔ Genuine OEM quality — prevents overheating and coolant loss
✔ Pressure Rating: 1.1 bar (16 PSI)

 

Honda 19045RAA003 Genuine Radiator Cap — for Honda and Acura Models

Coolant leaks from the radiator neck, engine overheating at idle or under load, a low coolant level warning, or steam coming from under the hood — these are common signs that your radiator cap is failing. A worn or stuck cap can cause coolant loss, pressure loss, and overheating, which can lead to severe engine damage. Replacing it with this genuine Honda radiator cap restores proper cooling system pressure and protects your engine.

This is a factory-original Honda radiator cap (OE part number 19045-RAA-003). It is engineered with a calibrated pressure relief valve and a vacuum valve to maintain the correct operating pressure in the cooling system, preventing coolant boiling and reducing the risk of hose and radiator damage. This is the same part sold at Honda dealerships .

When to Replace

• Coolant leaks from the radiator neck or cap area
• Engine overheating at idle or under load
• Low coolant level warning or coolant loss
• Steam or coolant spray from under the hood
• The cap does not hold pressure (can be tested with a pressure tester)
• Damaged or cracked rubber gasket on the cap

Product Details & Highlights

• ✔ Genuine Honda OEM — not an aftermarket or Chinese replica
• ✔ Calibrated pressure relief valve — opens at 1.1 bar (16 PSI)
• ✔ High-temperature rubber gasket — ensures a leak-free seal
• ✔ Made from corrosion-resistant materials — for long service life
• ✔ Direct replacement — fits factory radiator neck
• ✔ Backed by Honda’s manufacturer warranty (minimum 12 months)

Package Contents

• 1 × Honda 19045RAA003 radiator cap (genuine)

FAQ

FAQ

Is this a genuine Honda part or a copy?
This is 100% genuine Honda OEM — in original factory packaging with the Honda part number printed on the label. It is not an aftermarket brand or a replica .

Does this fit my 2015 Honda CR-V?
Yes — the 2015 CR-V uses this radiator cap. We recommend verifying with your VIN .

Does this fit my 2010 Honda Accord?
Yes — the 2010 Accord is listed as compatible. Please verify with your VIN .

What is the pressure rating of this cap?
The pressure rating is 1.1 bar (16 PSI) .

Can I reuse the old cap?
If the cap is in good condition and holds pressure, it can be reused. However, we recommend replacing it if the gasket is damaged or the cap no longer holds pressure.

Does this cap come with a new gasket?
Yes — the gasket is pre-installed on the cap assembly. No separate gasket is required.

What is the torque spec for installation?
The cap should be tightened by hand until it seats. Do not overtighten — this can damage the cap or the radiator neck.

Does this cap fit the Honda S2000?
Yes — the S2000 (2006–2009) is listed as compatible. Please verify with your VIN .

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