Coolant Bottles / Expansion Tanks

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
Related, superseded, cross reference or alternative numbers for comparison.

95B121407A

The product you are viewing cross references to these numbers

Coolant Expansion Tank, LHD.

Restore cooling-system integrity and reliable coolant management with this OE Match Coolant Expansion Tank, 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

Also known as a coolant reservoir or header tank, the expansion tank is an important part of the engine cooling system. As the engine reaches operating temperature, the coolant heats up and expands. The expansion tank provides the necessary space to accommodate this change in coolant volume while forming part of the sealed, pressurised cooling circuit.

When the engine cools, the coolant contracts and the system returns towards its cold operating level. Because the tank is continually subjected to heat, pressure and repeated thermal cycles, its plastic construction can eventually become brittle, cracked or distorted. Seams and hose connection points can also deteriorate and begin leaking.

This OE Match Coolant Expansion Tank provides a high-quality replacement for a cracked, leaking or deteriorated original reservoir, helping restore correct coolant containment and dependable engine cooling.

What This Product Does:

• Stores the cooling system's reserve coolant.
• Accommodates coolant expansion as engine temperature rises.
• Helps manage changes in coolant volume during heating and cooling.
• Forms part of the sealed cooling circuit.
• Supports correct cooling-system pressure management.
• Provides a point for monitoring coolant level.
• Helps ensure sufficient coolant remains available to the cooling circuit.
• Works with the expansion tank cap and associated coolant hoses.
• Helps maintain reliable engine temperature control.
• Replaces a cracked, leaking or deteriorated coolant reservoir.
• Helps restore cooling-system integrity when tank failure is the cause
•  Is specified for compatible LHD Porsche applications.
• Provides an OE Match alternative to the corresponding original component.  

Symptoms Of Wear Or Failure:

• Visible coolant leaking from the tank.
• Repeatedly falling coolant level.
• Low coolant warning messages.
• Coolant collecting beneath the vehicle.
• Cracks in the expansion tank.
• Leakage along moulded tank seams.
• Leakage around hose connections.
• Dried coolant deposits around the reservoir.
• Sweet coolant smell around the vehicle.
• Plastic becoming brittle or heavily discoloured.
• Damage around tank mounting points.
• Coolant loss primarily when the engine is hot.
• Frequent need to top up the cooling system.
• Cooling system struggling to maintain pressure.
• Engine temperature running higher than normal.
• Steam or coolant vapour from the engine compartment in severe cases.  

Why Replacement Matters:

• The coolant expansion tank operates as part of a hot, pressurised cooling system and must remain structurally sound and properly sealed.
• A small crack or deteriorated seam may initially leak only when the coolant reaches operating temperature and system pressure increases. This can make early leaks difficult to identify. As the tank continues through repeated heating and cooling cycles, minor damage can become progressively worse.
• Continued coolant loss reduces the quantity of fluid available to absorb and transfer engine heat. It can also allow air into the cooling circuit, potentially causing poor circulation, temperature fluctuations and localised overheating.
• If coolant loss becomes severe enough, the engine may overheat. Prolonged or significant overheating can result in expensive damage to seals, gaskets and major engine components.
• A damaged expansion tank can also interfere with the cooling system's ability to maintain its intended pressure. Correct pressure is important for effective cooling-system operation and for controlling the coolant's boiling characteristics at operating temperature.
• Replacing a defective reservoir with this OE Match Coolant Expansion Tank helps restore coolant containment, cooling-system integrity and reliable engine temperature management.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95B121407A

The product you are viewing cross references to these numbers