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If you own an Infiniti FX35, a properly functioning transmission cooler line is key to maintaining transmission temperature and preventing fluid loss. Choosing the right line affects cooling efficiency, long-term reliability, and ease of maintenance during repair or replacement. This guide shortlists the top options for the Infiniti FX35 and explains the evaluation criteria used, including material quality and installation fit. Read on to see the selections and practical factors to consider before you replace a line.
Looking for other parts? See all Infiniti FX35 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Automatic Transmission Oil Cooler Line Hose Assembly |  |
| Most Popular A crowd favorite that many people choose with confidence | Generic 52" Stainless Steel Braided Transmission Cooler Line Kit (AN6) |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman Transmission Oil Cooler Line 624-097 (OE Fix) |  |
| Best Budget The cheapest option that still gets the job done reliably | Byredio 6AN Braided Fuel/Transmission Hose 20 ft |  |
| Most Sold A high-volume bestseller chosen again and again | Generic 6AN 70" Stainless Steel Braided Transmission Cooler Line Kit |  |
| Best Value for Money The sweet spot between price and what you get | MuHize 70" Stainless Steel Braided Transmission Cooler Line Kit |  |
| Best Overall The best all-around choice for most situations | maXpeedingrods 6AN Nylon Stainless Steel Braided Fuel and Cooler Hose Kit (20 ft) |  |
1. A-Premium Automatic Transmission Oil Cooler Line Hose Assembly
| Compatible vehicles | Dodge Grand Caravan, Chrysler Town & Country, Ram C/V (listed years/engines) |
|---|---|
| Part numbers | 5005204AA, 5005204AC, 5005204AD, 5005204AE, 5005204AF, 5005204AG, 5005205AA, 52014764AA, 624-284 |
| Transmission | 6 Speed Transmission |
| Length | 24 inches |
This transmission oil cooler line assembly replaces the factory cooler hoses on compatible Dodge Grand Caravan, Chrysler Town & Country, and Ram C/V models; it connects the transmission to the external cooler to circulate fluid and help control transmission temperature. Typical use is as a direct replacement during a cooling-line repair or when a leaking or damaged line is found. Notable features include multiple referenced part numbers for direct interchange, corrosion-resistant construction, and a 24 inch hose length for routing on the vehicle. Buyers will appreciate that the assembly arrives as a ready-to-install unit that matches factory routing and reduces labor compared with fabricating lines. Limitations to consider are that fitment is specific to the listed minivan models and engine/transmission combos, some customers noted the supplied caps and clips were not OEM quality and may need replacement, and long-term durability versus factory lines will depend on installation and road conditions. Verify compatibility with the exact vehicle before ordering.
Best for: Reliability-focused buyers who prioritize a straightforward, ready-to-install replacement that restores transmission cooling without extensive modification.
Less Ideal for: Drivers seeking parts specifically for an Infiniti FX35 or those who require factory-quality clips and fittings included should look for parts made for their exact model.
- Direct-fit replacement with multiple referenced part numbers for simpler compatibility checks
- Corrosion-resistant construction designed for leak-free performance
- Arrives as a complete assembly that reduces time compared with rebuilding lines
- Positive user feedback reporting good fit and resolved leaks on compatible vehicles
- Not designed for Infiniti FX35 so not compatible with that vehicle
- Some customers reported subpar retaining clips and protective caps compared with factory-quality parts
- Long-term durability may vary compared with factory lines depending on driving conditions
Verdict A practical, direct-fit transmission cooler line assembly for the listed minivans that simplifies repairs, but confirm vehicle compatibility and plan to replace small clips if needed.
2. Generic 52" Stainless Steel Braided Transmission Cooler Line Kit (AN6)
| Material | Stainless Steel and PTFE |
|---|---|
| Length | 52 Inches |
| Fitting Size | AN6 (6AN) |
| Compatible Transmissions | Common GM and Ford automatic transmissions listed |
This kit supplies stainless steel braided PTFE lines and AN6-style fittings to route transmission fluid from the transmission to an auxiliary cooler or radiator-based cooler. It is typically used to retrofit a trans cooler or replace corroded rubber lines on older vehicles; the 52-inch length and included 90 degree fittings let you route lines through the engine bay for common transmission locations. The stainless braid and PTFE core offer corrosion resistance and flexibility while swivel fittings simplify attachment. Practical benefits include improved cooling capacity for towing or spirited driving and a visible durability upgrade over factory rubber hoses. Limitations are the universal AN6 sizing and adapter needs for some factory transmission fittings, and occasional quality-control issues reported for fitment, thread finish, or incorrect lengths out of the box, which may require buying additional adapters or rethreading fittings. Installation requires basic tools and some knowledge of transmission fluid routing and sealing practices.
Best for: Convenience-driven buyers who want a ready-made, off-the-shelf kit to add transmission cooling without custom hose fabrication and who value quick retrofitability.
Less Ideal for: Drivers seeking a vehicle-specific, guaranteed-fit OEM replacement or professional installers who prefer custom-built hoses matched to factory fittings should consider other options.
- Stainless steel braid with PTFE core for corrosion resistance and flexibility.
- Includes multiple 90 degree fittings and transmission inserts to simplify routing.
- Universal AN6 fittings work with many aftermarket coolers and adapters.
- Long 52-inch length covers common routing needs for many engine bays.
- AN6 universal sizing can require additional adapters to mate with some factory fittings.
- Quality variation reported by some buyers including occasional wrong lengths or poor thread finish.
Verdict A convenient, low-effort way to add or replace transmission cooler lines with durable braided hoses, but expect possible adapter needs or occasional quality inconsistencies.
3. Dorman Transmission Oil Cooler Line 624-097 (OE Fix)
| Material | Metal, Rubber |
|---|---|
| Maximum Pressure | 100 Pound per Square Inch |
| Position | Center |
This Dorman transmission oil cooler line replaces the factory-style line with a crimped metal-to-rubber connection that is engineered to resist the corrosion that commonly causes original lines to fail. It is intended for installation where the vehicle uses the same routing and fittings as the original; typical use is as a direct replacement during a transmission cooling line repair. The crimped connection offers substantially greater joint strength than a standard spring clamp, which reduces the chance of leaks developing where the rubber meets the metal. The part is machined and includes the fittings and clips needed to mount in the vehicle. Installation requires access behind the radiator and may involve draining or partially draining coolant and removing the cooling fan on some vehicles, so plan for a moderate labor effort. Fitment reports are generally positive, though a few users needed minor modifications or returned items due to incorrect fit for specific model years, so verify compatibility for your FX35 before ordering.
Best for: Performance-oriented buyers who prioritize a stronger, longer-lasting replacement part to maintain reliable transmission cooling under spirited driving and towing conditions.
Less Ideal for: Buyers looking for a plug-and-play solution without any risk of fitment mismatch or those unwilling to allow time for potential coolant drainage and moderate installation work.
- Crimped metal-to-rubber connection designed to resist corrosion and reduce leaks
- Built to match original routing and mounting for straightforward replacement where compatible
- Includes necessary clips and fittings for installation
- Manufactured and engineered with aftermarket experience focused on durability
- Some buyers reported fitment issues on certain model years requiring modification or return
- Installation can require partial coolant drainage and radiator fan removal which increases labor time
Verdict A sturdily rebuilt transmission cooler line that improves joint strength and corrosion resistance, but confirm fit for your Infiniti FX35 before installation.
4. Byredio 6AN Braided Fuel/Transmission Hose 20 ft
| Material | Nylon, Stainless Steel, CPE rubber |
|---|---|
| Maximum Pressure | 500 Pound per Square Inch |
| Size | AN6 20FT |
| Temperature Range | -40ºF to 248ºF |
This 6AN braided hose from Byredio is a long, flexible replacement line intended for high-pressure fluid routing such as fuel, oil return, and transmission cooler feed or return lines. The tube combines a CPE synthetic rubber inner with a stainless-steel braid and woven nylon outer layer to resist abrasion and broaden temperature tolerance. At 20 feet you can cut custom lengths for routing along the FX35's transmission cooler run and the 500 PSI working pressure covers typical aftermarket cooler systems. The hose bends more readily than rigid metal or hard plastic lines which simplifies installation in tight engine bays, and its claimed compatibility with many fluids (excluding E85) makes it versatile for transmission cooler plumbing. Limitations to note are that this is a universal hose requiring AN fittings and careful clamping or crimping at joints, and the outer nylon braid can fray if not finished before clamping. Expect to supply appropriate fittings and clamps and to trim and seal the braid for a neat, durable installation on an Infiniti FX35.
Best for: Budget-conscious DIY owners fitting or re-routing transmission cooler lines on an Infiniti FX35 who prioritize low cost and adaptability over a vehicle-specific preassembled line.
Less Ideal for: Buyers seeking a ready-made, vehicle-specific hose assembly with pre‑installed fittings or those who prefer a stamped factory-quality replacement should consider hose kits made specifically for the FX35.
- Long 20 ft length allows cutting custom runs and reduces need for joins
- 500 PSI rated for common transmission cooler and fuel system pressures
- Flexible construction eases routing in tight engine bays
- Stainless steel braid and nylon cover improve abrasion and temperature resistance
- Universal hose requires separate AN fittings and proper end finishing
- Not compatible with E85 fuel as stated
- Outer nylon braid can fray and may need tape or sealing before clamping
Verdict A flexible, low-cost 6AN braided hose that lets budget-minded FX35 owners trim and route transmission cooler lines themselves, provided they add proper fittings and finish the braid.
5. Generic 6AN 70" Stainless Steel Braided Transmission Cooler Line Kit
| Material | Stainless Steel and PTFE |
|---|---|
| Fitting size | 6AN |
| Length | 70 Inches |
| Part Number | H-OFK19-70-SS |
This kit supplies two 70-inch stainless steel braided PTFE transmission lines and a selection of 6AN fittings intended to connect a transmission to an auxiliary cooler. It is typically used by DIY mechanics to replace corroded factory soft lines or to add an aftermarket cooler for improved heat control when towing or spirited driving. The stainless braid and PTFE inner liner mean the hoses resist abrasion and corrosion while remaining flexible enough to route through the engine bay. Included swivel fittings and several 90-degree adapters help with tight routing and reduce kinking. Practical benefits include higher pressure tolerance than many rubber lines and a neat, aftermarket appearance. Important limitations are that the kit is universal rather than vehicle-specific so additional adapters or fittings may be required for proper fitment on some cars, and reported quality control issues mean buyers should verify thread fit and inspect for leaks before installation. Measure factory fittings carefully to avoid mismatched connections when fitting an Infiniti FX35.
Best for: A risk-averse mainstream buyer who wants to replace deteriorated transmission hoses or add an aftermarket cooler for better thermal control without pursuing custom hose fabrication.
Less Ideal for: Buyers seeking a direct-fit, vehicle-specific replacement for an Infiniti FX35 or installers who prefer pre-matched OEM-style fittings should choose a vehicle-specific kit or have hoses professionally made.
- Stainless steel braid with PTFE liner improves abrasion and corrosion resistance compared with rubber lines
- 70-inch length suits routing to remote coolers and gives flexibility in placement
- Includes swivel fittings and 90-degree adapters to aid routing in tight engine bays
- Higher pressure tolerance suitable for heavy-duty or towing applications
- Universal 6AN fittings are not vehicle-specific and may require buying additional adapters for a proper seal on some transmissions
- Some buyers report inconsistent quality control including mismatched sizes or damaged fittings on arrival
Verdict A durable, universal braided 6AN cooler line kit that can improve cooling and durability but may need extra adapters or inspection to fit an Infiniti FX35.
6. MuHize 70" Stainless Steel Braided Transmission Cooler Line Kit
| Material | Stainless steel braided over PTFE |
|---|---|
| Hose length | 70 Inch |
| Included fittings | AN-6 to NPT and inverted flare adaptors, 4L80E adapters |
| Package quantity | 1 kit (2 hoses + fittings) |
This MuHize kit supplies two 70-inch stainless-steel braided PTFE transmission hoses plus a comprehensive set of AN and NPT adaptors to connect aftermarket coolers or reroute lines. It is typically used when replacing corroded hard lines or when fitting an external cooler to a vehicle that requires AN-6 (3/8") connections. The braided stainless jacket and PTFE core give good resistance to heat, corrosion, and kinking, while the assortment of billet adaptors and 4L80E adapter fittings makes it simple to adapt to different fittings during installation. Real-world benefits include stronger, more flexible routing around exhaust and suspension parts and reduced risk of leaks compared with brittle factory hard lines. Limitations are that the hoses are a single 70" length which can be excess on some installations and will often require trimming or additional clamps for a tidy fit, and buyers must verify the Infiniti FX35 transmission port size and routing before assuming the included fittings are correct. Overall it is a practical, hardware-rich option for owners fitting an external cooler or replacing worn lines.
Best for: A practical optimizer who wants durable, hardware-complete transmission lines to install an external cooler or replace old hard lines while minimizing additional parts purchases and rework.
Less Ideal for: Buyers looking for a bespoke, vehicle-specific plug-and-play line set or those who prefer pre-flared, factory-spec lines designed specifically for the Infiniti FX35 should consider purpose-made replacements instead.
- Stainless steel braid over PTFE core for strong, heat- and corrosion-resistant routing.
- Comes with a wide assortment of AN-6 to NPT and inverted flare adaptors and 4L80E fittings so fewer extra parts are needed.
- Two 70" hoses provide flexibility to route around tight engine bays or to fit larger radiators or remote coolers.
- Billet adaptors simplify leak-free connections compared with generic slip fittings.
- Single fixed 70-inch hose length may be too long for some installs and requires trimming or extra clamps.
- Kit includes a variety of fittings but may still lack the exact port size for some vehicle-specific transmission fittings.
- No vehicle-specific installation instructions for Infiniti FX35 included in the kit.
Verdict A cost-conscious, hardware-rich braided line kit that gives durable, flexible routing for aftermarket coolers but requires verification of FX35 port fitment and may need trimming for a clean install.
7. maXpeedingrods 6AN Nylon Stainless Steel Braided Fuel and Cooler Hose Kit (20 ft)
| Hose size | 6AN (ID 0.34 inch) |
|---|---|
| Length | 20 Feet |
| Working pressure | 500 PSI |
| Burst pressure | 2000 PSI |
| Outer braid | 304 Stainless Steel with Nylon |
This kit supplies 20 feet of 6AN (AN6) braided hose designed for fuel lines, transmission cooler lines, turbo cooler lines and similar fluid routing on an Infiniti FX35. The inner CPE synthetic rubber tube bonded to a nylon and 304 stainless outer braid gives a durable, abrasion-resistant hose rated for operating temperatures from about -40 F to +350 F and a working pressure of 500 PSI with a listed burst around 2000 PSI. The package includes a variety of push-lock AN6 fittings in straight, 45, 90 and 180 degree angles so you can route lines and make assemblies without sourcing separate ends. In real use this means plenty of hose length for a full FX35 cooler run and strong abrasion and heat resistance in the engine bay. Expect to spend some time trimming hose, seating ferrules and following the supplied assembly steps; a few user reports show the supplied fittings can be finicky or incompatible with certain installation methods. For a balanced buyer wanting a full-length kit rather than piecing components, this is a practical, cost-conscious option, but installers seeking factory-style crimped ends or guaranteed fit with specific OEM connectors may want a different solution.
Best for: Balanced, do-it-yourself Infiniti FX35 owners who want a single kit with enough hose and assorted AN6 fittings to replace or reroute transmission cooler lines without sourcing parts separately.
Less Ideal for: Owners who require factory-quality crimped ends, guaranteed compatibility with OEM connectors, or a plug-and-play OEM replacement should consider purpose-made FX35 transmission cooler lines instead.
- Full 20 feet of AN6 hose provides enough length for a complete FX35 transmission cooler run
- Durable CPE inner tube with nylon and 304 stainless braid for good heat and abrasion resistance
- Includes multiple angled AN6 push-lock fittings to simplify routing and connections
- Wide operating temperature range and a 500 PSI working pressure rating supports typical cooling and fuel duties
- Fittings use push-lock style that may not seat correctly with the hose in all cases and can require additional clamps or ferrules
- Not a factory-style crimped hose end system so professional crimp tools may be needed for an OEM-quality seal
- Some users reported fitting quality issues and occasional assembly difficulty
Verdict A complete, long AN6 braided-hose kit that offers good heat and abrasion resistance for an Infiniti FX35 cooler run but relies on push-lock fittings rather than factory crimped ends.
Choosing the Right Infiniti FX35 Transmission Cooler Line: Key Factors to Consider
Material and Corrosion Resistance
The construction material determines how well a cooler line withstands road salts, moisture, and heat cycling. Metal hard lines resist abrasion and puncture but can corrode over time if not properly coated. Stainless steel and coated aluminum options offer better long-term resistance to rust and can extend service life.
Rubber or reinforced hose sections provide flexibility where needed, but their outer coverings and internal reinforcement should be rated for transmission fluid and high temperatures. Choosing materials designed for automotive transmission fluids reduces the risk of premature failure and fluid contamination.
Fitment and Routing Accuracy
Correct fitment means the line follows the factory routing without forcing bends or contact with sharp edges. Accurate routing reduces stress points that can lead to cracking or chafing, and it makes installation faster and less error-prone.
Look for lines or kits that specify direct fit for the Infiniti FX35 and include any necessary mounting clips or brackets. Even small deviations in length or bend shape can create strain that shortens service life, so fitment accuracy is a practical priority.
Connector and Seal Compatibility
Transmission cooler lines use specific fittings and seals where they join the cooler, radiator, or transmission. Mismatched connectors increase the chance of leaks and can complicate installation. Lines that include OEM-style fittings or compatible replacement fittings reduce the need for adaptation.
Inspect whether included seals are high-temperature rated and compatible with transmission fluid. Properly torqued fittings and quality sealing surfaces are essential to prevent slow leaks that may be hard to detect until significant fluid loss occurs.
Durability Under Heat and Vibration
Transmission lines experience constant vibration and elevated temperatures. Materials and joints must tolerate repeated thermal expansion and contraction without loosening or cracking. Reinforcement layers in hoses and robust crimped or welded joints on hard lines help maintain integrity under these conditions.
Consider lines designed for high-mileage use or commercial applications if you drive in stop-and-go traffic, tow, or operate in hot climates. Enhanced durability reduces the likelihood of mid-life failures and the need for early replacement.
Ease of Installation and Serviceability
A line that installs with minimal disassembly saves time and reduces labor. Features that help include pre-bent hard lines that match factory angles, included mounting hardware, and clear instructions. Kits that provide both hard and flexible sections for complex routing can simplify repairs.
Serviceability also means the ability to replace a single section or fitting without removing unrelated components. Lines designed with common fittings and available replacement parts make future repairs quicker and cheaper.
Leak Detection and Maintenance Considerations
Early detection of a leak can prevent major transmission damage. Choose lines and fittings that make visual inspection easy, such as accessible fittings and smooth external surfaces where fluid buildup is noticeable. Some materials hide minor weeps, so consider routing and access when planning maintenance checks.
Regular inspection intervals, attention to fitting torque, and prompt replacement of worn hoses or seals will limit the impact of any leak. Factor in how easy it will be to inspect and service the lines on the Infiniti FX35 when selecting an option.
FAQ
How do I know if my Infiniti FX35 transmission cooler line is leaking?
Common signs include drips or wet spots under the vehicle near the transmission area, a low transmission fluid level, or a burning smell if fluid contacts hot components. You may also notice transmission slipping or erratic shifting when fluid level becomes low. Inspect visible lines and fittings for wetness and check fluid levels regularly to confirm a leak.
Can I replace a transmission cooler line myself on an Infiniti FX35?
Many owners can perform a line replacement if they have basic mechanical skills, the right tools, and a safe way to support the vehicle. Replacement typically involves draining some fluid, loosening fittings, and swapping the line while avoiding contamination. If routing or fittings are difficult to access, professional assistance may be advisable.
Is it better to use a hard line or a hose for the transmission cooler line?
Hard lines offer better resistance to abrasion and puncture and hold shape for consistent routing. Hoses provide flexibility where movement or complex routing is present and can simplify installation. Often the best solution uses a combination: hard lines for fixed runs and reinforced hoses for connection points or areas requiring flex.
What should I do if I detect a small leak at a cooler line fitting?
First, tighten the fitting to the manufacturer's torque specification if accessible and safe to do so. If the leak continues, replace the sealing components such as crush washers or O-rings and inspect the mating surfaces for damage. Persistent leaks or damaged threads usually require replacement of the affected line or fitting.
How often should I inspect the transmission cooler lines on an Infiniti FX35?
Inspect the lines during regular maintenance intervals, such as at oil changes or every few thousand miles, and after any impact or off-road use. Checking for wetness, abrasion, or loosened clamps more frequently in extreme climates or towing conditions helps catch issues early. Prompt attention to any anomalies prevents fluid loss and transmission damage.
How We Chose the Best Infiniti FX35 Transmission Cooler Line
We evaluated candidate transmission cooler lines for the Infiniti FX35 using criteria that reflect real-world use and shop practicality. Primary factors included material and construction quality to resist corrosion and abrasion; fitment accuracy and OEM-style routing to ensure straightforward installation on the FX35; connector and seal compatibility to minimize leak risk; and thermal performance to support efficient heat transfer under load. We also considered long-term durability under road exposure and the availability of replacement parts such as fittings and hose sections. Excluded from consideration were generic universal hoses that require substantial custom modification, products without clear material specs, and options lacking documented fitment for the Infiniti FX35. Our approach favored components that reduce installation time, lower the likelihood of future leaks, and maintain proper transmission cooling for typical driving and towing conditions.
Our full evaluation process is outlined in our review methodology.
Conclusion
When selecting a transmission cooler line for the Infiniti FX35, prioritize material quality, correct fitment, and compatible fittings to reduce the risk of leaks and ensure reliable cooling. Balance the need for durability with ease of installation by choosing configurations that follow factory routing and use appropriate reinforcements. Remember that routine inspection and timely replacement of worn hoses or seals greatly extend component life. Focus on the factors discussed here to match a line to your driving conditions and maintenance preferences.
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