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- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 GT3 MKI 1999-02
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
• 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.
• 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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This Coolant Expansion Tank is a OE MATCH Porsche 982 Boxster / Cayman component designed to regulate coolant levels and maintain optimal pressure within the engine cooling system. Fitted within the cooling circuit, this expansion tank allows coolant to expand and contract safely as temperatures fluctuate, ensuring consistent engine temperature control.
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Diagram Ref No 1
What This Product Does:
- Manages coolant expansion and contraction during temperature changes
- Maintains correct cooling system pressure
- Stores excess coolant and returns it when required
- Supports efficient engine temperature regulation
- Prevents overheating by stabilising the cooling system
Symptoms Of Wear Or Failure:
- Coolant leaks or visible cracks in the tank
- Low coolant warnings or frequent top-ups
- Engine overheating Coolant smell from the engine bay
- Discoloured, brittle, or warped plastic due to heat exposure
- Loss of system pressure, reducing cooling efficiency
Why Replacement Matters:
- Prevents coolant loss and overheating
- Maintains proper cooling system pressure
- Protects the engine from heat-related damage
- Ensures consistent coolant circulation
- Avoids costly repairs caused by cooling system failure
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982121407C
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This Engine Water Coolant Reservoir is a OE MATCH Porsche component designed to store and regulate coolant within the engine cooling system. Also known as an expansion tank, it allows coolant to expand and contract safely as temperatures fluctuate, helping to maintain consistent pressure and efficient engine cooling.
Fits:
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- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Diagram Ref No 1
What This Product Does:
- Stores excess coolant and returns it to the system when needed
- Manages coolant expansion and contraction
- Maintains correct system pressure for efficient cooling
- Supports consistent engine temperature regulation
- Prevents overheating by stabilising the cooling system
Symptoms Of Wear Or Failure:
- Coolant leaks or visible cracks in the tank
- Low coolant warning light or frequent need for top-ups
- Engine overheating Coolant smell from the engine bay
- Discoloured or brittle plastic due to age and heat exposure
- Loss of system pressure, reducing cooling efficiency
Why Replacement Matters:
- Prevents coolant loss and overheating
- Maintains proper cooling system pressure
- Protects the engine from heat-related damage
- Ensures reliable coolant circulation
- Avoids costly repairs caused by cooling system failure
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- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
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- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
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- Porsche Cayman GT4 Clubsport
- Porsche Cayman GT4 RS Clubsport 2020-2024
Engine coolant filler neck lid
OE Match engine coolant filler neck lid for Porsche 981 and 982 Boxster and Cayman, including the specified Spyder, GT4 and Clubsport applications. This replacement closes the coolant filling access point.
Fits
- Porsche 981 Boxster 2012 - 2016
- Porsche 981SP Boxster Spyder 2016
- Porsche 981C Cayman 2014 - 2016
- Porsche 981 Cayman GT4 2016
- Porsche 982 Boxster 2017 - 2024
- Porsche 982C Cayman 2017 - 2024
- Porsche 982 Spyder 2019 - 2024
- Porsche 982 Cayman GT4 2019 - 2024
Diagram ref no 2
What This Product Does
The lid forms the closure at the coolant filling neck, covering the opening between servicing operations. It helps exclude debris and keeps the access area properly closed after coolant maintenance.
Functions
- Closes the coolant filling opening.
- Shields the access point against dirt.
- Restores the closure when the previous lid is damaged or absent.
- Allows the filling area to be closed again following service work.
Technical Details
- Brand: OE Match.
- Supplied part reference: 98110604406.
- Identified in the supplied diagrams as a coolant end cap or water closure cap.
- Located within the coolant reservoir and filling-neck assembly.
Symptoms of Fault
- Visible cracks, distortion or broken sections.
- A closure that sits loosely or cannot be refitted correctly.
- An uncovered filling opening following loss of the lid.
- Residue or debris around the access point requiring inspection.
- Brittleness or damage discovered during reservoir maintenance.
Why Replacement Matters
Repeated handling, ageing and exposure to heat can leave the closure damaged or poorly seated. Renewing an unsuitable lid restores the intended closure of the filling access point. OE Match develops replacement components around Porsche applications, using original references and fitment checks to guide specification.
Inspect the adjoining neck before installation. Coolant loss or temperature warnings require diagnosis of the cooling system rather than assuming this access lid is responsible.
Reference Numbers
98110604406; 98110604405; 98110604404; 98110604403. Compare the vehicle's original reference and application details when selecting a replacement.
FAQs
Is it the expansion-tank pressure cap?
No. The supplied assembly diagrams distinguish this filling-neck closure from the separate reservoir pressure cap.
When should the lid be renewed?
Replace it if damaged, absent, distorted or unable to seat securely. Check the neck for related damage at the same time.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98110604406
The product you are viewing cross references to these numbers