Expansion Tank Renault Trafic Opel Vivaro Coolant Reservoir Bottle 7700312900

Renault Trafic Opel Vivaro Expansion Tank is an original cooling system component from the Expansion Tanks group, designed for professional commercial vehicle service. This used OEM Renault part ensures factory fit, stable cooling system operation, and predictable engine performance across a wide range of loads.

Specifications and technical data

• SKU: 7700312900
• Mark: Renault
• Condition: Used
• OEM Part Number: 7700312900
• Substitutable numbers: 7700312900
• Category: Expansion & Overflow Tanks

Purpose and Function in the Cooling System

The expansion tank is responsible for compensating for coolant volume changes, stabilizing pressure, and safely managing excess fluid. In vehicles like the Renault Trafic and Opel Vivaro, this is crucial for maintaining the engine's correct operating temperature, especially during intensive urban and delivery driving.

Thanks to its construction conforming to original Renault factory standards, this component works seamlessly with original hoses, connectors, and mounting points, reducing the risk of leaks and simplifying coolant level checks during servicing.

Benefits of Using an Original Expansion Tank

Using an original expansion tank in a Renault Trafic or Opel Vivaro allows the cooling system's performance parameters to be maintained as intended by the manufacturer. In practice, this means:

• a secure fit with factory brackets and mounting points,
• proper interaction with the pressure cap and sensors (if present in the specific vehicle configuration),
• appropriate chamber geometry that facilitates correct system bleeding,
• a reduced risk of engine overheating due to improper cooling system function.

For commercial vehicles that often operate under load, choosing an original part from the Expansion Tanks category is a safe and technically sound solution.

Product Characteristics and Installation

The presented expansion tank is a used part, sourced from a dismantled vehicle, offering factory fit at a cost-effective repair price. The design, as conceived by the vehicle manufacturer, allows for installation in place of a worn or damaged component without the need for modifications, shortening service time and reducing the risk of installation errors.

In practice, installation involves disconnecting the coolant hoses, removing the old tank, and installing the presented component in the existing mounting points. After replacement, thorough bleeding of the cooling system and a leak check at operating temperature are recommended.

Application in Service and Operation

Replacing the expansion tank is particularly recommended in situations where:

• cracks or micro-leaks are present in the housing,
• there are signs of coolant leakage around the tank,
• there are difficulties in maintaining a constant coolant level in the system,
• visible wear or damage to the connection spigots.

Selecting an original Renault part helps reduce the risk of recurring faults and ensures predictable cooling system behavior in the long term.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Renault and need other components from the same group, such as additional tanks, mounting elements, or related parts, check the available parts in the Renault Expansion Tanks category.

To better plan your repair and optimally select used components for your car, it's worth familiarizing yourself with practical tips for sourcing parts from a single location – a detailed discussion can be found in the article Comprehensive Sourcing: From Engine to the Smallest Clip – How to Assemble Used Car Parts in One Place?.