Description
Billet Aluminum Heater Core Fittings – VW MK4 1.8T (AN10)
Give your cooling system a long-term upgrade with our billet aluminum heater core fittings made for MK4 1.8T models. The factory plastic fittings are known to dry out, crack, and leak over the years—especially when exposed to heat and when hoses are removed. This set replaces them with a strong, clean-looking billet solution that you can rely on.
Each piece is CNC-machined from T6061 aluminum and finished to resist corrosion and wear. The kit converts the factory connection to AN10, making it a great option for anyone running upgraded coolant lines, custom plumbing, or simply refreshing the engine bay.
Features & Benefits
- Replaces the brittle OEM plastic heater fittings
- Machined from genuine T6061 aluminum for long service life
- AN10 sizing allows for clean, secure aftermarket hose routing
- Better sealing and heat resistance than stock parts
- Corrosion-resistant finish with a clean OEM-plus look
- Direct fit where the stock fittings attach at the firewall
Ideal for:
- Engine refresh or rebuilds
- Heater core replacement jobs
- Coolant system upgrades
- Custom AN plumbing conversions
Fitment
- VW MK4 Golf, GTI, and Jetta – 1.8T engines
Included in the Kit
- 2x Billet Aluminum AN10 Heater Core Fittings
This upgrade eliminates a well-known weak point in the MK4 cooling system while adding a cleaner, more durable setup. A simple change with real benefits—both in reliability and appearance.
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