The MMX Performance Billet Air Conditioning Caps are precision-engineered replacements for the factory plastic AC service caps found on BMW and MINI models. Designed to address a small but common weak point in the engine bay, these billet aluminum caps offer improved durability, sealing reliability, and a refined OEM+ appearance.
Over time, OEM plastic AC caps are prone to becoming brittle due to repeated heat cycles, age, and frequent removal during servicing. This can lead to cracking, poor sealing, and an untidy engine bay. MMX eliminates these issues by replacing plastic with a long-lasting CNC-machined 6061-T6 aluminum solution.
Each cap is finished in anodized black, hand-polished, and engraved with a subtle MMX “X” logo to seamlessly match the MMX billet aluminum engine bay range. The result is a functional upgrade that looks purpose-built rather than aftermarket.
MMX offers direct replacements for both OEM AC cap types, ensuring compatibility across a wide range of BMW and MINI platforms. This includes older R134A systems using black OEM caps, as well as newer R1234YF systems (circa 2017+) that use grey OEM caps.
Designed as true OEM replacements, the MMX billet AC caps are pre-sealed and install in seconds with no tools or modification required. They are fully reversible, require no AC system re-gas, and can be removed or returned to stock just as easily as the original parts.
This is a simple but effective upgrade for enthusiasts who care about longevity, detail, and a clean, well-finished engine bay.
Product Features
- CNC-machined from 6061-T6 aluminum
- Anodized black finish with engraved MMX “X” logo
- Direct OEM replacement design
- Pre-sealed for quick, hassle-free installation
- Fully reversible; returns to stock in seconds
- Designed to match the MMX billet aluminum engine bay range
- No AC system re-gas required
Compatibility
R134A Systems (Black OEM Caps)
OEM part numbers:
- 64 53 8 397 437
- 64 53 8 387 438
R1234YF Systems (Grey OEM Caps)
OEM part numbers:
- 07 14 9 287 978
- 07 14 9 287 979
Fitment Disclaimer
While every effort has been made to ensure accurate vehicle information, customers are responsible for verifying compatibility with their specific vehicle and engine variant prior to purchase.