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Coolant Bottles / Expansion Tanks
By OE Match
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
OE Match coolant expansion (overflow) tank that forms part of the Taycan’s closed cooling system. It serves as a buffer reservoir for coolant volume changes caused by temperature fluctuations in the system. It also provides a visible coolant level reference and a fill point for maintenance. As a direct-fit replacement, it integrates with the factory hoses, clamps, and sensors without modification.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts expanding coolant when temperature rises, preventing over-pressure in the cooling circuit.
• Stores slightly extra coolant, which returns to the main system when temperatures drop - maintaining consistent coolant levels.
• Provides a safe, sealed reservoir that resists coolant chemistry, temperature, and vibration - preventing leaks or contamination.
• Offers a sight-glass or translucent body (or level markings), making coolant level checks simple and straightforward for maintenance.
Over time, coolant expansion tanks may develop cracks, stress fractures or leaks due to pressure cycling, temperature variation, or material fatigue - particularly in high-performance or electric cooling systems. If the expansion tank fails, you risk coolant leaks, pressure loss, overheating or inadequate coolant circulation.
An OE Match replacement restores proper system pressure management, coolant containment, and leak-free operation. It protects the drivetrain’s thermal management integrity, supports battery/motor cooling stability, and helps prevent costly damage or component failure.
When to Replace Consider replacing the expansion tank if:
• The original shows visible cracks, deformation, or plastic fatigue.
• There is coolant loss or leakage under the car or around the reservoir.
• The system shows erratic coolant-level changes or pressure anomalies.
• You are performing cooling-system maintenance, overhaul, or upgrades.
• You notice discoloration, brittleness, or internal contamination in the tank material.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
The product you are viewing cross references to these numbers
OEMatch Coolant Bottles and Expansion Tanks — Durability, Sealing, Performance
Coolant bottles and expansion tanks store excess coolant and manage pressure as the engine heats and cools, maintaining system volume on Porsche models. Many owners search for genuine or OEM coolant bottles and expansion tanks; these are direct-fit alternatives designed to match the original form, fit and function. Replacing a degraded tank reduces the risk of coolant loss and overheating.
- Replacement plastic reservoirs for standard cooling systems
- Pressurised expansion tanks with integrated sensor mounting
- Pressure caps and remote overflow tanks
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche's original coolant bottles and expansion tanks. OE (Original Equipment) refers to parts matching original specifications for the coolant bottles and expansion tanks and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM coolant bottles and expansion tanks engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. OEMatch supplies a wide range of Porsche parts, from gaskets to suspension hardware, engine items and interior trim. The company has catalogued over 4,000 part numbers and more than 8,700 OE cross-references, and continues to expand its Porsche-focused range.
- Restored coolant capacity and stable system pressure
- Reduced risk of leaks and overheating
- Improved reliability and easier level monitoring
- Plastic fatigue or cracking from thermal cycling
- Leaks at seams, hose connections or caps
- Faulty pressure caps or contamination within the cooling system
A compromised expansion tank can cause rapid coolant loss, pressure instability and overheating, which in turn may lead to engine damage. Timely replacement restores system integrity, helps maintain correct pressure and coolant level, and supports consistent engine operating temperatures on Porsche vehicles.
- Direct replacement options made to original-spec dimensions and tolerances
- Compatible mounting points and sensor interfaces where applicable
- Material choices intended to resist heat, pressure and vibration
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified.
