Description
xShop Now Genuine Porsche Water Hose Online – Part 99110683301
The Genuine Porsche Water Hose 99110683301 is an original OEM coolant hose engineered specifically for the Porsche 911 (991) series. This hose plays an important role in maintaining stable coolant circulation within the rear-engine cooling system. It is designed to meet exact factory specifications, ensuring proper fluid flow, pressure balance, and temperature regulation.
In high-performance vehicles like Porsche, even a single coolant hose must withstand continuous heat cycles, pressure changes, and long driving hours. This OEM Porsche cooling pipe is manufactured using durable, heat-resistant materials that maintain flexibility and strength over time. It supports efficient engine temperature control, which is critical for performance and longevity.
Coolant hoses can gradually weaken due to age, heat exposure, or internal pressure. Replacing a worn hose with a genuine Porsche spare part prevents coolant leaks, overheating risks, and unexpected breakdowns. Because this part matches factory dimensions precisely, installation is straightforward without modification or forcing.
This Porsche 991 cooling system hose is commonly listed in coolant system diagrams under rear-end cooling and heater breather line sections, depending on the specific model variant. Whether for standard Carrera models or performance versions like Turbo and GT variants, using a genuine component ensures consistent operation.
At Europeanautospares, we supply factory-approved Porsche components that maintain original engineering standards. Each part is sourced to ensure OEM quality and dependable service life.
Specifications
- Brand: Porsche
- Part Number: 99110683301
- Product Type: Water Hose / Coolant Hose
- Material: OEM-spec reinforced rubber compound
- Condition: New
- Fitment Type: Direct replacement
- Application: Engine cooling system (rear section/heater breather line, depending on model)
-
Manufacturing Standard: Porsche factory specification
Why Choose European Auto Spares
Factory-Approved Porsche Quality
All parts supplied by Europeanautospares meet original factory standards to ensure correct fitment and reliable cooling performance.
Exact Fit for Porsche 991 Models
This OEM Porsche coolant hose matches factory dimensions precisely, reducing installation time and eliminating compatibility issues.
Built for High-Performance Driving
Designed to withstand heat, pressure, and daily driving conditions, this hose supports consistent engine cooling in both normal and demanding environments.
VIN Compatibility Support
Our team can help verify part compatibility using your vehicle identification number for complete peace of mind.
Worldwide Online Ordering
You can purchase this product not only within the UAE but also online from anywhere in the world. We carefully pack and ship internationally using reliable delivery services.
Maintain Reliable Cooling Performance
The Genuine Porsche Water Hose 99110683301 may seem like a simple component, but it plays a critical role in maintaining proper coolant circulation. A damaged or aging hose can lead to leaks, overheating, or pressure imbalance within the cooling system. Replacing it on time helps protect engine components and prevents costly repairs.
Using genuine Porsche spare parts ensures that your vehicle continues to perform according to factory standards. At Europeanautospares, we focus on supplying components that maintain the original engineering integrity of your Porsche. Proper cooling system maintenance supports long-term reliability and smooth driving performance
Fitment Details
xPorsche 911 (991) Rear Lower RHS Coolant Hose Fitment
Engine Water Cooling Specification Matrix — Rear Lower Right Feed, Bridge, and Connector Hoses
| Model / Generation | Application Details (Engine Water Cooling — Rear Lower Right Feed & Connector Hoses) | Year Range |
|---|---|---|
| Porsche 911 Carrera (991.1) | Rear RH Lower 3.4L Naturally Aspirated H6 (350HP) Underbody Return Lines — Main Subframe Bypass Hose | 2012–2016 |
| Porsche 911 Carrera S (991.1) | Rear RH Lower 3.8L Naturally Aspirated H6 (400HP) Primary Feed Connectors — Thermostat-to-Chassis Interface | 2012–2016 |
| Porsche 911 Carrera 4 / 4S | Rear RH Lower All-Wheel Drive Naturally Aspirated Platform Bridge Hoses — Widebody Spec Clearance Line | 2013–2016 |
| Porsche 911 Carrera GTS / 4 GTS | High-Output 3.8L Naturally Aspirated H6 (430HP PowerKit) Valvetrain Links — High-Velocity Distribution Coupling | 2015–2016 |
| Porsche 911 50th Anniversary | Anniversary Edition 3.8L NA Flat-Six Classic Chassis Chassis-to-Engine Feeds — Specialized Core Return Coupling | 2014 |
| Porsche 911 GT3 (991.1) | High-Revving 3.8L DFI Motorsport H6 (475HP) High-Pressure Engine Inlets — Reinforced Motorsport Hard-Line Adapter | 2014–2016 |
| Porsche 911 GT3 RS (991.1) | Track-Spec 4.0L Naturally Aspirated H6 (500HP) Sump-Adjacent Water Pipes — High-Expansion Heavy Duty Segment | 2016 |
| Porsche 911R (991) | Limited-Edition 4.0L Pure NA Heritage Block Lower Right Return Plumbings — Pure GT Specification Performance Hose | 2016 |
| Porsche 911 Turbo (991.1) | Rear RH Lower 3.8L Twin-Turbocharged H6 (520HP) Core Coolant Supply — Turbocharger Sump Circuit Branch Hose | 2014–2016 |
| Porsche 911 Turbo S (991.1) | Rear RH Lower Flagship Twin-Turbo H6 (560HP) High-Thermal Feed Paths — Heavy-Armor Heat-Shielded Line | 2014–2016 |
| Porsche 911 Turbo / S (991.2) | Gen II Facelift 3.8L Twin-Turbo Platform Rear Underbody Expansion Blocks — Facelift Specific Quick-Connect Assembly | 2017–2020 |
| Porsche 911 GT2 RS (991.2) | Extreme Performance 3.8L Twin-Turbo (700HP) Intercooler-Loop Proximity Runs — Ultra-High Thermal Capacity Fluid Track | 2018–2020 |
Weissach Workshop & Hydraulic Thermal Management Advisory Notice
This professional-grade rear lower right-hand side (RHS) water cooling feed line, structural bridge hose, and quick-connect coupling assembly is engineered strictly for the underbody-to-engine fluid circuits of the 991 generation Porsche 911 family. Positioned low adjacent to the rear suspension subframe and structural oil sump boundaries, this critical plumbing junction handles primary coolant return tracking from the front-mounted radiator matrices back to the rear-mounted flat-six powerplants.
Critical Structural Engineering & Variant Architecture Warnings: Technicians must recognize that the 991 platform’s lower engine bay layout displays intense mechanical variations across model tiers. Symmetrical base Carrera models rely on standardized underbody line tracks. However, widebody all-wheel-drive configurations (Carrera 4/4S/GTS) incorporate different clearance packaging offsets to step around the rear differential axle outputs. The GT3, GT3 RS, and 911R models utilize a completely distinct motorsport block architecture (derived from GT racing programs) featuring radically higher operational oil and coolant pump velocities to handle engine speeds up to **9,000 RPM**. Sourcing a baseline Carrera return hose into a GT3 or a Turbo platform is a high-liability error.
The 911 Turbo and GT2 RS forced-induction models subject this rear lower quadrant to immense radiant heat soak from the adjacent low-slung turbocharger turbine housings and hot exhaust downpipes. On these flagship configurations, the lower RHS coolant lines must be equipped with factory-applied vulcanized heat-shield armoring. Installing a standard non-shielded naturally aspirated hose will cause the outer elastomer layers to blister, char, and split under thermal wash, provoking a rapid, high-pressure loss of coolant fluid directly onto the rear tires, which can induce immediate high-speed vehicle instability or severe cylinder head thermal distortion.
Furthermore, the 991.2 facelift generation transitions to an updated, thicker composite quick-connect locking collar system that is structurally non-interchangeable with early 991.1 spring-clip designs.
Service & Installation Best Practices: Accessing these lower right hose interfaces requires raising the vehicle safely on a alignment lift, dropping the large aerodynamic plastic underbody plates, and removing the right-rear wheel splash panels. Never attempt to lever or pry the composite quick-connect plastic shells with raw metal screwdrivers, which will micro-fracture the aged glass-reinforced resin couplings. Compress the spring retaining wire or sliding plastic release clips squarely parallel to pull the hose straight off its aluminum hard-line receiver sleeve.
Thoroughly clear all scale deposits and calcified crust away from the aluminum seating surfaces before attempting installation. Always lubricate the inner EPDM sealing ring using a thin coating of clean, factory-specified pink OAT coolant concentrate. Slide the connection home until an audible mechanical click confirms the lock. Because the 911’s front-to-rear coolant lines span the full length of the chassis, the system cannot be purged via traditional stationary bleeding methods. Refilling the cooling network requires the explicit use of a workshop vacuum extraction fill system to drop the network down to a deep vacuum before charging the fluid. Failure to apply a vacuum pull traps stationary air pockets in the elevated cylinder head jacket curves, causing immediate hot-spot steam venting, erratic thermostat cycling, and catastrophic valvetrain warping. Torque any supporting stabilizing bracket bolts to **10 Nm** to prevent lines from chafing against moving suspension members.
Peroxide-Cured EPDM Elastomeric Compound
The main flexible hose structures are molded from high-grade, peroxide-cured EPDM rubber matrices reinforced with multi-ply aramid or Nomex knitted fabric linings. This technical composition guarantees exceptional dimensional stability, zero wall swelling when exposed to aggressive organic acid technology (OAT) anti-freeze formulas, and resistance to electrochemical degradation.
Glass-Reinforced Polyamide (PA66-GF30) Quick-Couplers
The termination ends incorporate over-molded quick-connect housings constructed from 30% glass-fiber reinforced polyamide 66. This structural design handles high working fluid pressure pulses up to **2.5 bar** and completely resists material creep or stress cracking when subjected to extreme, prolonged sub-engine operating temperatures ranging from $-40^{\circ}\text{C}$ to $+140^{\circ}\text{C}$.
FAQs
xFrequently Asked Questions
It carries coolant between engine components, helping regulate temperature and maintain stable cooling performance.
Yes, this is a genuine OEM Porsche component manufactured to factory specifications.
Yes. A damaged hose may lead to coolant leaks or overheating, which can affect engine performance and reliability.
It is typically replaced during cooling system repairs, maintenance service, or if signs of wear, cracking, or leakage appear.
It fits many 991.1 and 991.2 variants, including Turbo and GT models, but VIN verification is recommended before purchase.
Yes, you can order online from anywhere worldwide. We provide secure international shipping to deliver genuine Porsche parts directly to your location.
Found It Cheaper.?
xShipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
- Choosing a selection results in a full page refresh.
