Coolant expansion tank bottle. Porsche 996 1997 - 2000  ❭  99610614756

Coolant expansion tank bottle.
Also called a coolant reservoir bottle, that’s responsible for collecting excess engine coolant and maintaining proper fluid levels within the cooling system as temperatures change. 

Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000

Diagram ref no 1

The expansion tank allows coolant to expand as it heats up and then returns it back to the cooling system once the engine cools, helping maintain correct pressure and fluid volume. It also provides a convenient point for coolant level checks and top-ups when needed.

Function:
•  Pressure/regulation: Manages thermal expansion of coolant to prevent overheating or coolant loss.
•  Containment: Acts as a buffer to capture overflow and maintain stable coolant levels as the engine cycles through temperature changes.
•  Durability: Engineered from heat-resistant materials that withstand prolonged thermal and mechanical stresses.

Over time, factory coolant expansion tanks become brittle and can develop cracks, leaks, or deformation due to heat cycles and coolant chemicals. A compromised reservoir can lead to coolant loss, loss of system pressure, and overheating - which in turn can damage your engine if ignored. Replacing tank restores proper coolant containment and helps preserve engine reliability and longevity.

Replace your coolant expansion tank if you observe any of the following:
•  Visible cracks, leaks or coolant seepage around the tank.
•  Coolant levels that fluctuate unexpectedly.
•  Plastic has become brittle, discoloured, warped or swollen.
•  Pressure issues or frequent coolant top-ups are required.
•  Any signs of coolant residue or stains around the engine bay.

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