• Honda 19045-PWA-004 Genuine Radiator Cap
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Honda

Honda 19045-PWA-004 Genuine Radiator Cap

Honda 19045-PWA-004 Genuine Radiator Cap

$22.07
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✔ Honda 19045-PWA-004 Radiator Cap — Genuine OEM Part
✔ Fitment: L-series and R-series engines in Civic, Fit/Jazz, HR-V, and other select models
✔ Direct replacement for factory radiator cap — no modifications required
✔ Manufactured to Honda's original specifications and tolerances
✔ Pressure rating: 1.1 bar (110 kPa) — maintains proper cooling system pressure

 

Honda 19045-PWA-004 Genuine Radiator Cap — 1.1 bar (110 kPa)

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 cap restores proper cooling system pressure and protects your engine.

This is a factory-original Honda radiator cap (OE part number 19045-PWA-004) with a 1.1 bar (110 kPa) pressure rating. 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
• Visible corrosion on the cap or radiator neck

Product Details & Highlights


• ✔ Genuine Honda OEM part — not an aftermarket or Chinese replica
• ✔ Calibrated pressure relief valve opens at 1.1 bar (110 kPa) for optimal cooling system protection
• ✔ Integrated vacuum valve allows coolant to flow back from the reservoir when the engine cools
• ✔ High-temperature resistant rubber gasket for a leak-free seal
• ✔ Made from corrosion-resistant materials for long service life
• ✔ Backed by Honda’s manufacturer warranty (valid through any authorized dealer)

Package Contents


• 1 × Honda 19045-PWA-004 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 Honda part number printed on the box. It is not an aftermarket brand or a replica.

Does this fit my 2010 Honda Fit with the L15A engine?
Yes — your Fit (2nd gen) with the 1.5L L15A engine requires this 1.1 bar cap. We recommend verifying with your VIN for absolute certainty.

What’s the difference between 19045-PWA-003 and 19045-PWA-004?
004 is the superseded part number — it replaces 003. 004 includes an updated rubber gasket material for improved long-term durability. It is fully backward-compatible.

Can I use a 1.3 bar (130 kPa) cap instead?
No — using a higher-pressure cap can damage your radiator, hoses, or water pump. Always use the pressure rating specified for your vehicle (1.1 bar for this cap).

How do I know if my radiator cap is bad?
Check for visible cracks in the rubber gasket, coolant residue around the cap, or overheating. You can also take it to a shop for a pressure test — it should hold 1.1 bar.

Does this fit my 2012 Honda Civic with the R18 engine?
Yes — the 8th–9th gen Civic with R18 uses this 1.1 bar cap. Please check your original cap number to be sure.

Will this cap fit the Honda CR-V?
No — CR-V with K-series engines uses a different radiator cap (usually with a higher pressure rating). Please check your original part number before ordering.

California Residents

WARNING

Cancer and Reproductive Harm.

www.p65warnings.ca.gov

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