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Water / Coolant Radiators
By OE Match
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
- Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
- Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
- Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
- Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman T 718 2.0L Manual (300 Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
- 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
OEMatch Water / Coolant Radiators — Fit, Function, Confidence
OEMatch supplies water and coolant radiators for Porsche models. Radiators control engine temperature by transferring heat from coolant to air, helping to prevent overheating and limiting thermal stress on engine components. This overview explains common types, failure modes and what to check when a Porsche radiator needs replacement.
Available Types
- Aluminium-core radiators with welded construction for efficient heat transfer
- Radiators with reinforced end tanks for higher-load or heavy-use applications
- Application-specific units for transaxle and front-engine Porsche models, including designs tuned for cooling capacity and packaging
Understanding OEMatch Water / Coolant Radiators
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original water and coolant radiators. OE (Original Equipment) refers to parts matching original specifications for the water and coolant radiators and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM water and coolant radiators engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Radiators move heat from the engine coolant into the airstream via a core of tubes and fins; end tanks and joints direct flow and sustain pressure. Materials and construction influence resistance to corrosion, mechanical damage and thermal cycling. OEMatch catalogues thousands of part numbers and OE cross-references to support coverage across Porsche model lines and continues to expand its range for long-term vehicle support.
Benefits Include
- Restored cooling efficiency and consistent engine temperature control
- Reduced risk of overheating and related engine damage
- Improved longevity through corrosion-resistant materials and quality joins
Why Water / Coolant Radiators Wear and Fail
- Corrosion and internal scale from old or contaminated coolant
- Leaks from cracked tanks, damaged cores or failed seals and joints
- Blockages caused by debris, oil contamination or coolant breakdown products
- Physical damage from road debris or impact
The Importance of Replacing with OEMatch Water / Coolant Radiators
A compromised radiator reduces cooling capacity and raises the risk of overheating, which can lead to costly engine repairs and degraded performance. Choosing a replacement designed for Porsche applications restores correct coolant flow and heat transfer, maintains engine operating temperature and supports reliable day-to-day use and spirited driving alike.
Advantages
- Aluminium cores and precision joins that support efficient heat exchange
- Reinforced end tanks and durable connections for leak resistance
- Manufactured to original-spec dimensions and tolerances so fitment aligns with factory mounting and cooling system routing
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified, and confirm correct hose connections, clamps and coolant specification after fitting.