Coolant Expansion Tank, LHD. Porsche 95B.2 Macan 2019-21  ❭  95B121407A

Coolant Expansion Tank, LHD.
Maintain reliable engine cooling and correct coolant management with this Porsche Coolant Expansion Tank, part number 95B121407A, designed for compatible Left-Hand Drive (LHD) Porsche applications.

Fits:

• Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
• Porsche 95B.2 Macan S Petrol 3.0L V6 (354Bhp) 2019-21
• Porsche 95B.2 Macan GTS Petrol 2.9L V6 (380Bhp) 2019-21
• Porsche 95B.2 Macan Turbo 2.9L V6 (440Bhp) 2019-21  

Diagram Ref No 1

The coolant expansion tank, also known as the coolant reservoir or header tank, forms an important part of the engine cooling system. As engine temperature rises, coolant expands and system pressure increases. The expansion tank provides the necessary space for this change in coolant volume while helping the cooling system maintain the correct operating level and pressure.

As the engine cools, coolant contracts and is drawn back through the system. This continuous expansion and contraction means the tank is repeatedly exposed to high temperatures, pressure and thermal cycling.

Over time, plastic expansion tanks can become brittle, discoloured or cracked. Seams, hose connections and mounting areas may also deteriorate, eventually allowing coolant to escape. A leaking tank can lead to gradual coolant loss and, if ignored, potentially result in engine overheating.

Replacing a deteriorated tank with the correct Porsche Coolant Expansion Tank 95B121407A helps restore a sealed, reliable cooling system and correct coolant capacity.

What This Product Does:

• Stores the cooling system's reserve coolant.
• Provides space for coolant expansion as engine temperature increases.
• Helps accommodate changes in coolant volume during heating and cooling.
• Supports correct cooling-system pressure management.
• Provides a convenient point for checking coolant level.
• Helps ensure coolant remains available to the cooling circuit.
• Works with the expansion tank cap and associated hoses.
• Helps prevent coolant loss when the system is operating correctly.
• Supports consistent engine temperature management.
• Replaces a cracked, leaking or deteriorated coolant reservoir.
• Restores the integrity of the cooling system when tank failure is the cause.
• Is specified for compatible LHD Porsche applications.  

Symptoms Of Wear Or Failure:

• Visible coolant leakage around the tank.
• Coolant collecting underneath the vehicle.
• Repeatedly falling coolant level.
• Low coolant warning messages.
• Cracks in the plastic tank.
• Leakage from tank seams.
• Leakage around hose connections.
• Coolant residue or dried deposits around the tank.
• Sweet coolant smell from the engine compartment.
• Tank becoming heavily discoloured or brittle.
• Damage around mounting points.
• Coolant escaping when the system reaches operating temperature.
• Frequent need to top up coolant.
• Engine temperature running higher than normal.
• Cooling system unable to maintain pressure.
• Steam or coolant vapour from the engine compartment in severe cases.  

Why Replacement Matters:

• The expansion tank must remain sealed and structurally sound because it operates as part of a hot, pressurised cooling system.
• A small crack may initially produce only a minor leak when the engine is hot. However, repeated heating and cooling can cause cracks to grow, increasing coolant loss over time.
• Insufficient coolant reduces the cooling system's ability to transfer heat away from the engine. Coolant loss can also introduce air into the system, potentially causing poor circulation, temperature fluctuations and localised overheating.
• If coolant loss becomes severe, the engine can overheat. Continued operation under overheating conditions can result in expensive damage to gaskets, seals and major internal engine components.
• A leaking tank can also prevent the cooling system from maintaining its intended pressure. Correct system pressure is important because it helps control the coolant's boiling characteristics at normal operating temperatures.
• Replacing a cracked or deteriorated reservoir with the correct Porsche Coolant Expansion Tank 95B121407A helps restore cooling-system integrity, maintain the correct coolant level and reduce the risk of overheating caused by coolant loss.

Related reference numbers
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95B121407A

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