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- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
The Genuine Porsche ATF Cooler Water Return Line is a replacement coolant pipe used within the Tiptronic automatic transmission cooling system on applicable Porsche 911 (996) models.
Fits:
- Porsche 996 C2 3.4L 1999-08/01
- Porsche 996 C4 3.4L 1999-08/01
- Porsche 996 C2 3.6L 2001
- Porsche 996 C4 3.6L 2001
- Porsche 996 C4S 3.6L 2001
Diagram Ref No 9
The line carries engine coolant away from the automatic transmission fluid (ATF) cooler after heat has been transferred between the transmission oil and the cooling circuit. By maintaining coolant circulation through the heat exchanger, it helps control automatic transmission fluid temperature and supports reliable Tiptronic gearbox operation.
It is important to note that 99630707705 carries coolant, not ATF itself. Porsche parts catalogues identify it specifically as the return-side water/coolant pipe within the Tiptronic ATF cooler assembly.
What This Product Does:
- Carries coolant away from the Tiptronic ATF cooler.
- Forms part of the automatic transmission temperature-control system.
- Allows coolant to circulate through the transmission heat exchanger.
- Helps control automatic transmission fluid temperature.
- Supports consistent Tiptronic gearbox operating temperatures.
- Maintains a sealed connection within the engine cooling circuit.
- Works with the ATF cooler and coolant supply line.
- Helps protect the transmission from excessive operating temperatures.
- Replaces a leaking, corroded, damaged or restricted original coolant pipe.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Visible coolant leakage.
- Coolant dripping beneath the vehicle.
- Gradual reduction in coolant level.
- Pink, red or white dried coolant residue around the pipe or connections.
- Coolant smell after driving.
- Dampness around hose or pipe joints.
- Corrosion on metal sections of the line.
- Cracking or deterioration around flexible sections or connections.
- Damaged or loose hose clamps.
- Coolant-system warning message or low coolant warning.
- Increasing engine coolant temperature if sufficient coolant is lost.
- Transmission temperatures becoming elevated if coolant circulation through the ATF cooler is compromised.
- Visible impact or underbody damage to the line.
- Kinking or deformation that restricts coolant flow.
Many of these symptoms can also originate from adjacent hoses, the ATF heat exchanger, seals or other cooling-system components, so the source of the leak should be confirmed before replacement.
Why Replacement Matters:
The Tiptronic transmission generates heat during normal operation. The ATF cooler helps regulate this temperature by transferring heat between the transmission fluid and the vehicle's cooling system.
For this process to work correctly, coolant must circulate freely through both the supply and return sides of the cooler.
A leaking or restricted return line can compromise this circulation and may cause:
- Loss of engine coolant.
- Reduced ATF cooling efficiency.
- Increased transmission operating temperatures.
- Increased strain on the cooling system.
- Coolant contamination around surrounding components.
- Engine overheating if coolant loss becomes severe.
Replacing a damaged line restores the intended coolant path and helps both the cooling and transmission systems operate correctly.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630707705
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
The gearbox oil cooler plays a critical role in regulating the temperature of automatic transmission fluid (ATF). As the Tiptronic transmission operates - especially during towing, spirited driving, hill climbs, or hot ambient conditions - ATF can heat up significantly. This cooler transfers excess heat from the transmission fluid into the engine’s cooling circuit or air stream, helping maintain the proper fluid temperature range.
Fits:
Cars with 8-speed Automatic gearbox for all-wheel drive (option code: G1G)
Porsche 958 (92A) Cayenne 3.6L 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L / 4.2L Diesel 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L HYBRID 2011 - 2014
Porsche 958 (92A) Cayenne 4.8L 2011 - 2018
Diagram ref no 4
By keeping the ATF within its ideal thermal window, the oil cooler helps:
• Preserve transmission lubrication properties
• Reduce wear on internal gearbox components
• Improve shift consistency and responsiveness
• Extend the life of seals, clutches, and bearings
• Prevent overheating-related transmission faults
Without an effective cooler, high ATF temperatures can degrade fluid performance and accelerate transmission wear or failure.
Fitment / Position on Car
• Installed on: Front engine bay, integrated into or adjacent to the cooling network
• Location: Connected via dedicated ATF coolant lines to engine cooling circuit or external coolers
• Integration: Interfaces with radiator, thermostat, transmission lines and pump circulation routing
High transmission fluid temperatures can lead to degraded lubrication, increased wear, clutch slippage, and premature failure. The gearbox oil cooler mitigates this risk by maintaining fluid temperatures in the proper range - especially during demanding driving. Using a Genuine Porsche OE gearbox oil cooler ensures the correct heat rejection rate, plumbing interfaces, and robust construction that match Porsche’s factory design - helping extend the life and performance of your Tiptronic transmission.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95830703700
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
This MAHLE gearbox oil cooler (ATF) is a high-quality aftermarket replacement designed to meet the exacting specifications of Porsche OE part number 95830703700. Engineered for optimal performance and thermal management, this transmission oil cooler helps protect your automatic gearbox by effectively dissipating heat from the ATF (automatic transmission fluid) in Porsche Cayenne 958 (92A) models built 2011–2018 with Tiptronic transmission
Fits:
Cars with 8-speed Automatic gearbox for all-wheel drive (option code: G1G)
Porsche 958 (92A) Cayenne 3.6L 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L / 4.2L Diesel 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L HYBRID 2011 - 2014
Porsche 958 (92A) Cayenne 4.8L 2011 - 2018
Diagram ref no 4
Automatic transmissions generate significant heat under load; without proper cooling, excessive ATF temperatures can accelerate fluid breakdown and wear internal components. This MAHLE oil cooler ensures effective heat transfer and helps maintain correct ATF temperatures, preserving transmission performance, extending component life, and supporting smooth shifting and drivetrain reliability.
This direct-fit cooler comes with a sealed brazed core and integrated seal ring for reliable installation as a genuine replacement for the original heat exchanger.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95830703700
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
The Eurowise Transmission Oil Cooler Upgrade Kit is designed for the Porsche 958 Cayenne where increased transmission cooling is required. Intended for demanding operating conditions, it provides a bolt-on auxiliary cooling arrangement using a high-capacity cooler, dedicated mounting hardware, hoses and a machined adapter.
Fits:
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
What This Product Does
This kit increases transmission oil cooling and fluid capacity to help manage heat when the Cayenne is used for heavy towing, slow and steep off-road driving, rock crawling or operation in hot climates. Eurowise states that the system provides twice the factory cooling and fluid capacity without introducing a pressure drop.
Functions
- Increases transmission oil cooling capacity
- Adds fluid capacity to the transmission cooling circuit
- Helps manage heat during towing and demanding off-road use
- Connects the transmission circuit to a high-capacity cooler using AN hoses
- Avoids tapping or modifying the original oil lines
- Retains compatibility with factory sensors and adaptive cruise control equipment
Technical Details
- Manufacturer: Eurowise Off Road
- Proprietary CNC-machined oil-cooler adapter
- Stainless-steel mounting brackets
- Installs behind the radiator shutter on applicable vehicles
- Bolt-on installation without cutting or custom fabrication
Why Upgrade
The standard transmission cooling system may have difficulty controlling oil temperature when the vehicle is exposed to sustained load, restricted airflow or high ambient temperatures. This upgrade adds a larger cooling arrangement while avoiding invasive modification of the factory lines. The purpose-made adapter and supplied hose assembly provide a direct connection between the transmission oil circuit and the additional cooler.
Kit Contents
- 1 x transmission oil cooler
- 1 x oil-cooler mount
- 1 x oil-cooler hose kit
- 1 x oil-cooler adapter
Installation Note
A Cayenne equipped with a winch requires a custom winch fairlead to accommodate the winch and transmission oil cooler together. Confirm this requirement before installation if a winch is already fitted or planned.
FAQs
- Does installation require cutting? No. Eurowise describes the kit as a bolt-on system that does not require cutting or custom fitting.
- Are the original transmission lines tapped? No. The supplied machined adapter allows the AN hose circuit to be connected without tapping the factory lines.
- Will it interfere with adaptive cruise control? The mounting arrangement is designed to avoid interference with factory sensors and features such as adaptive cruise control.
- Is additional hardware supplied? The kit includes the cooler, mount, hose assembly and adapter required for the cooling upgrade.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EWPG2EN01
The product you are viewing cross references to these numbers