SKU: 63793 | UPC: 84663637933
Moroso 01-06 BMW E46 M3 Coolant Expansion Tank – Direct Bolt-In Replacement
This Moroso coolant expansion tank serves as a direct replacement for the factory unit on 2001-2006 BMW E46 M3 models. The OEM plastic tank often cracks under heat and pressure leading to leaks and overheating. Moroso’s design uses stronger materials with extra capacity to maintain consistent coolant levels during track or street driving.
Key Features
- Direct Bolt-In Fit: Matches OEM mounting points for simple installation without modifications on E46 M3.
- Larger Capacity: Holds more coolant than stock to reduce overflow and provide buffer during high-heat conditions.
- High-Temp Nylon Construction: Translucent material resists cracking and warping from engine heat and pressure cycles.
- Clear Level Visibility: Easy monitoring of coolant levels without removal for quick checks at the track.
- Pressure-Resistant Design: Handles boosted or high-rpm demands common in modified M3 engines.
Product Notes
- Inspect OEM tank during replacement for cracks or damage.
- Fill with compatible coolant and bleed system after install.
- Secure packaging protects against shipping damage.
Installation Notes
- Professional installation recommended.
- Drain coolant system before removal of old tank.
- Uses factory hardware and hoses for plug-and-play fit.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2001-2006 | BMW | M3 | E46 |
Why Choose Moroso?
- Moroso builds parts trusted by racers since 1958.
- Focus on cooling solutions for high-performance engines.
- Engineered for precision fit and long-term durability.
Frequently Asked Questions
- Q: Does this fit non-M3 E46 models?
A: No, designed specifically for 2001-2006 BMW E46 M3 coolant system layout and mounting. - Q: What material is the tank made from?
A: High-temperature translucent nylon that withstands 250+ degree heat without deforming. - Q: What is the warranty and install process?
A: Backed by Moroso limited warranty. Bolt-in takes 30 minutes with basic tools after draining coolant.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure box 10 x 8 x 6 inches
- Weight: 1 lb
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