Engine coolant filler neck lid. Porsche 981 / 982 Boxster / Cayman  ›  98110604406

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