BLOX Racing Radiator Cap – 1.3 Bar Type A V2 | 2017+ Honda Civic Type-R / 2002+ Subaru WRX

A small part with a big job — the BLOX Racing Type A V2 Radiator Cap maintains the correct 1.3 bar (approximately 18.9 PSI) pressure in your cooling system, ensuring optimal coolant boiling point, proper system pressurization, and reliable cooling performance. Engineered specifically for the 2017+ Honda Civic Type-R (FK8) and 2002+ Subaru WRX, this V2 cap features BLOX’s updated sealing design for improved reliability over the factory cap — a simple, affordable upgrade that protects a very expensive engine.

Key Features:

• 1.3 bar (approx. 18.9 PSI) pressure rating — matches the factory cooling system specification for the FK8 Civic Type-R and WRX
• Type A fitment — application-specific cap design for correct neck diameter and sealing surface compatibility
• V2 design — BLOX’s updated second-generation cap with improved sealing reliability over V1
• Direct replacement — replaces the factory radiator cap with no modification required
• BLOX Racing quality — engineered to maintain consistent pressure under the thermal demands of performance driving
• Affordable insurance — one of the lowest-cost components in the cooling system with significant consequences if it fails

Performance Benefits:

• Correct System Pressure: Maintaining the specified 1.3 bar pressure raises the coolant’s boiling point, preventing cavitation and ensuring the cooling system operates within its designed parameters
• Improved Sealing Reliability: V2 design addresses sealing improvements over the original cap for more consistent pressure retention under heat cycling
• Prevents Coolant Loss: A properly sealing cap prevents coolant from escaping through the overflow, maintaining the correct coolant level and system pressure
• Engine Protection: Consistent cooling system pressure is critical for preventing overheating — particularly important on high-output turbocharged engines like the K20C1 (FK8) and EJ/FA series (WRX)
• Direct Fit: Application-specific Type A fitment ensures correct sealing surface contact and pressure relief valve operation

Specifications:

• Brand: BLOX Racing
• Part Number: BXCC-00090-V2
• Pressure Rating: 1.3 bar (approx. 18.9 PSI)
• Type: Type A
• Version: V2
• Fitment: Direct replacement

Fitment Information:

• 2017+ Honda Civic Type-R (FK8) — K20C1 turbocharged engine
• 2002+ Subaru WRX — EJ205/EJ257/FA20DIT engines (verify specific year and model)
• Note: Verify your specific year, model, and radiator cap type before ordering. Radiator cap fitment is determined by neck diameter and pressure rating — using an incorrect cap can cause cooling system issues.
• Direct replacement — no modification required

What’s Included:

• BLOX Racing Type A V2 radiator cap – 1.3 bar (BXCC-00090-V2)

Installation Notes:

• Allow the engine to cool completely before removing the radiator cap — opening a pressurized hot cooling system can cause severe burns
• Remove the old cap by pressing down and turning counter-clockwise
• Install the new cap by pressing down and turning clockwise until it locks
• Check coolant level after installation and top up if necessary
• Inspect the radiator neck sealing surface for cracks or damage before installing the new cap

Why Replace Your Radiator Cap?

The radiator cap is a pressure relief valve — it maintains system pressure up to its rated value, then opens to release excess pressure into the overflow reservoir. Over time, the rubber seals degrade, the spring weakens, and the cap loses its ability to maintain consistent pressure. A failing cap can cause coolant loss, inconsistent system pressure, and in worst cases, overheating — all of which are particularly damaging on high-output turbocharged engines. Replacing the radiator cap is one of the lowest-cost preventive maintenance items available, and the BLOX V2 design improves on the factory cap’s sealing reliability for added peace of mind.

Why BLOX Racing?

BLOX Racing has been producing performance and maintenance parts for import enthusiasts since 1999. Their radiator cap lineup covers a wide range of popular Japanese platforms with application-specific fitments and pressure ratings — ensuring the correct cap for each cooling system rather than a generic universal fit. The V2 update reflects BLOX’s commitment to continuous improvement based on real-world feedback from the enthusiast community.

Perfect For:

• 2017+ Honda Civic Type-R (FK8) owners replacing a worn or suspect factory radiator cap
• 2002+ Subaru WRX owners performing cooling system maintenance or upgrades
• Track day and performance builds where cooling system reliability is critical
• Anyone experiencing coolant loss or inconsistent cooling system pressure on these platforms
• Preventive maintenance builds refreshing all cooling system components simultaneously

Pro Tip: Replace the radiator cap whenever you flush and refill the cooling system. It’s a negligible cost compared to the rest of the service and ensures the entire cooling system is operating with fresh, properly-sealing components.

⚠️ Safety Note: Never open the radiator cap on a hot engine. Always allow the engine to cool completely before removing the cap — pressurized coolant can cause severe scalding burns.