Coolant hose with quick release coupling Genuine Porsche part 9J1121448

Water coolant distributor.



Fits:
Porsche (9J1) Taycan 2021>>

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Diagram ref no 1

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PAD121406

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Coolant expansion tank bottle.
This genuine coolant expansion tank is the original-spec reservoir that forms part of the Taycan’s coolant system, responsible for managing coolant volume and pressure as the system heats and cools. Manufactured by Porsche to strict OEM standards.

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 excess coolant as it expands under heat, preventing over-pressure in the cooling system.
•  Allows coolant to return to the system when temperatures drop, helping maintain proper coolant volume and pressure.
•  Provides a clean, secure housing that resists heat, pressure, and coolant chemistry - preventing leaks and degradation.
•  Maintains correct coolant level and system integrity, vital for thermal management of batteries, motors, and inverter cooling.

When to replace.  You should consider replacing the coolant expansion tank if:
•  The original shows cracks, discoloration, deformation, or leaks.
•  Coolant level drops unexpectedly without visible external leak - indicating internal crack or cap failure.
•  The tank becomes brittle, warped, or chemically aged due to coolant exposure and heat cycles.
•  You are restoring or servicing the cooling system, or performing maintenance/replacement of hoses, pumps or thermal components.

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9J1121407A

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Coolant expansion tank bottle
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.

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9J1121407A

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Coolant expansion tank bottle
The MAHLE CRT 392 000S coolant expansion tank is a high-quality replacement reservoir for the Porsche Taycan’s liquid-cooling and thermal-management system. Cross-referenced to Porsche part number 9J1121407A, the unit is supplied with the reservoir cap and coolant-level sensor, providing a practical, complete replacement for a leaking, cracked or damaged original tank.

Fits:
Porsche 9J1.1 Taycan 2020 - 2024

Diagram ref no 1

The expansion tank accommodates changes in coolant volume as the thermal-management system heats and cools. It stores excess coolant from the closed circuit, helps the system manage pressure and provides a reserve supply as the coolant contracts. Maintaining the correct coolant level is essential to the stable operation of the Taycan’s temperature-control system.

Key Features and Benefits
•  MAHLE replacement cooling-system component
•  Supplied with coolant reservoir cap
•  Includes integrated coolant-level sensor
•  Direct cross-reference to Porsche 9J1121407A
•  Helps restore correct coolant containment and level monitoring
•  Designed for dependable, leak-free operation
•  Suitable for replacement of cracked, leaking or damaged tanks

Why Replacement Matters
A cracked or leaking expansion tank can cause coolant loss, prevent the system from maintaining the correct fluid level and compromise thermal-management performance. Prompt replacement helps protect the cooling circuit and supports stable temperature control for the vehicle’s electrical drivetrain systems.

When to Replace the Expansion Tank
•  Coolant is visible around the reservoir or its connections
•  The tank body is cracked, distorted or discoloured
•  A low-coolant warning remains after the coolant level is corrected
•  The integrated level sensor is faulty
•  The reservoir cap or sealing area is damaged
•  Coolant level falls repeatedly without an obvious external hose leak
•  During cooling-system repair or accident-damage restoration

Related reference numbers
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9J1121407A

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