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If you drive a Lexus IS and notice higher steering temperatures under towing, spirited driving, or stop-and-go traffic, choosing the right power steering cooler can make a practical difference. The right cooler helps keep steering fluid within safe operating temperatures, which can reduce wear on seals and the pump and preserve steering feel over time. This guide covers the top shortlisted power steering coolers that fit the Lexus IS and explains the key factors we considered.Read on to understand the cooling performance, installation effort, and build quality that mattered when assembling this list.
Looking for other parts? See all Lexus IS parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Derale 13260 Dual Pass Aluminum Heat Sink Cooler |  |
| Best Value The sweet spot between price and what you get | Hayden Automotive Power Steering Oil Cooler (Model 1012) |  |
| Best Budget The cheapest option that still gets the job done reliably | Hayden Automotive 1011 Power Steering Oil Cooler |  |
| Highest Rated A top-rated pick with lots of positive feedback | Hayden 1009 Power Steering Oil Cooler (9 inch) |  |
| Most Popular A crowd favorite that many people choose with confidence | Derale 13200 Power Steering Cooler Kit |  |
| Best Seller A high-volume bestseller chosen again and again | Derale 4-Pass Power Steering Cooler Kit |  |
1. Derale 13260 Dual Pass Aluminum Heat Sink Cooler
| Mounting Type | Rails |
|---|---|
| Cooler Heatsink Material | Aluminum |
| Included Components | Derale 13260 Dual Pass Aluminum Heat Sink Cooler |
The Derale 13260 is a compact dual-pass aluminum heat sink cooler that fits frame rails and is typically used to lower power steering or other hydraulic fluid temperatures. Its aluminum construction and external and internal cooling fins increase heat transfer, and the dual-pass design forces fluid through the core twice for improved cooling at low airflow conditions such as city driving or off-road crawling. Installation is straightforward using rail-style mounting and common fittings, making it a practical add-on for cars like the Lexus IS that need extra cooling without major modification. Practical benefits include a small 3 inch diameter that eases packaging in tight spaces and solid construction that customers report holds up in daily use. Limitations are that it is a simple air-to-fluid cooler without integrated fans, so cooling depends on vehicle airflow or additional fan assistance, and some units show variability in weld finish so inspect joints during installation.
Best for: Balanced owners seeking a straightforward, factory-quality upgrade to keep power steering fluid cooler during spirited driving or towing without a major system overhaul.
Less Ideal for: Drivers who need active cooling under extreme continuous loads or who prefer a complete fan-equipped cooler solution should consider other options.
- Aluminum heat sink with external and internal fins for efficient passive heat transfer
- Dual-pass design increases cooling effectiveness at low vehicle speeds
- Compact 3 inch diameter fits tight frame rail locations
- Rail-style mounting simplifies installation in common underhood or bumper areas
- No built-in fan means effectiveness drops without adequate airflow or an auxiliary fan
- Some buyers report inconsistent weld quality on certain units
Verdict: A compact, dual-pass aluminum cooler that provides effective passive cooling for power steering fluid in tight engine bays.
2. Hayden Automotive Power Steering Oil Cooler (Model 1012)
| Liquid Volume | 1.87 Liters |
|---|---|
| Upper Temperature Rating | 257 Degrees Fahrenheit |
| SAE J300 Viscosity Grade | 20W-50 |
| Item Form | Oil |
The Hayden Automotive 1012 power steering oil cooler installs inline to reduce operating temperature of power steering fluid and help prolong the life of the pump and hoses. It is factory tested and intended for straightforward installation in vehicles that accept an inline cooler; typical use is on street-driven cars where the steering system runs warm from sustained low-speed maneuvering or towing. The cooler is supplied as a single unit and uses vehicle fluid lines for connection, so it adds cooling capacity without complex plumbing. Practical benefits include lower fluid temperatures under load and a simple plug-in replacement-style fit for compatible setups. Limitations are that the listing provides minimal fitment guidance specific to the Scion tC, and some installations may require brackets or hose adapters not included. Buyers should verify hose sizing and mounting options before purchase.
Best for: Budget-conscious owners seeking an affordable way to reduce steering fluid temperatures and extend component life without major system changes.
Less Ideal for: Owners who need guaranteed vehicle-specific fitment, included mounting hardware, or a full kit with hoses and fittings should consider a complete cooler kit or professional-installed option.
- Factory-tested unit for consistent performance
- Designed to lower power steering fluid temperature and extend component life
- Single-unit supply simplifies installation for compatible inline setups
- No vehicle-specific fitment information or hardware such as mounting brackets or hose adapters included
Verdict: A low-cost, factory-tested inline cooler that helps lower steering fluid temperatures and protect pump and hoses.
3. Hayden Automotive 1011 Power Steering Oil Cooler
| Model | Power Steering Oil Cooler 1011 |
|---|---|
| Recommended hose I.D. | 3/8 inch |
| Exterior | Machined |
| Unit count | 1.0 Count |
| Manufacturer | Hayden Automotive |
The Hayden 1011 power steering oil cooler is an inline cooler intended to reduce operating temperature in power steering systems where heat is a concern, like vehicles with larger tires or frequent low-speed work. It installs in the return hose and comes with mounting hardware for a straightforward bolt-up. By shedding heat it helps protect the pump, hoses, seals and fluid, which can reduce premature failures and maintenance on older or heavily used systems. The unit is machined for durability and sized for systems using 3/8 inch I.D. return hose; Hayden offers similar coolers for different duty levels. Limitations are that fitment depends on hose inner diameter and available mounting space, and it does not include hose or fittings beyond the supplied bracket hardware, so installers should verify hose size and routing before purchase.
Best for: A risk-averse mainstream buyer looking to protect factory steering components on a Scion tC by reducing heat-related wear and extending service intervals.
Less Ideal for: Drivers who need a universal, tool-free retrofit or who cannot accommodate a small inline cooler in their engine bay should consider integrated radiator-mount options or professional installation.
- Reduces power steering fluid temperature to help prolong pump and hose life
- Machined exterior for a durable, serviceable finish
- Includes mounting hardware for simpler installation
- Sized for common 3/8 inch I.D. return hoses used in many aftermarket setups
- Requires matching hose inner diameter and enough underhood space for installation
Verdict: A compact, machined inline cooler that lowers steering fluid temperatures to help extend the life of Scion tC power steering components.
4. Hayden 1009 Power Steering Oil Cooler (9 inch)
| Material | Aluminum |
|---|---|
| Overall Length | 9 Inches |
| Fits Hose I.D. | 3/8 Inch |
| Construction | Tube, Fin |
The Hayden 1009 is a compact aluminum power steering oil cooler intended to lower operating temperature in hydraulic steering systems by increasing fluid surface area and airflow. It mounts inline with 3/8-inch I.D. return hose lines and is commonly used on vehicles that see towing, larger tires, or prolonged low-speed steering work where fluid heat builds up. The unit includes mounting hardware and uses a tube-and-fin, two-row construction to improve heat rejection while remaining lightweight and machined for corrosion resistance. Installation is straightforward for a competent DIYer and the cooler helps reduce wear on pumps, hoses, seals, and fluid by keeping temperatures in check. Limitations include its fixed 9-inch length and 3/8-inch fittings, which restrict fitment to systems that accept that hose size, and it is a single-purpose add-on so it does not address underlying steering component faults.
Best for: Reliability-focused owners who want to reduce steering-system heat and extend the life of pumps, seals, hoses, and fluid without major modifications.
Less Ideal for: Drivers looking for universal fitment or adjustable plumbing options should consider models with multiple inlet sizes or adapter kits instead.
- Aluminum tube-and-fin construction for effective heat dissipation and corrosion resistance
- Includes mounting hardware for straightforward installation
- Designed for 3/8-inch I.D. return hose common on many power steering systems
- Compact 9-inch length fits tight engine bays where larger coolers will not
- Fixed 3/8-inch hose connection limits compatibility with systems using different hose sizes
- No adjustable fittings or adapters included for nonstandard plumbing
Verdict: A compact, aluminum inline cooler that reliably lowers power steering fluid temperature to help preserve system components.
5. Derale 13200 Power Steering Cooler Kit
| Special Feature | Expanded Copper Tubing and Aluminum Cooling Fins |
|---|---|
| Inlet Size | 11/32 inch hose barb inlets |
| Model Name | 13200 |
| Installation Type | Self-Adhesive |
The Derale 13200 is a compact power steering cooler kit intended to reduce fluid temperature and help prevent heat-related pump failure. It mounts in front of the radiator or condenser and routes steering fluid through 1/2 inch copper tubing expanded into aluminum cooling fins to shed heat during normal driving and towing. The kit includes hose barb inlets and basic hardware for bolt-on installation, making it a straightforward add-on for routine maintenance or cooling upgrades. In practice it lowers operating temperature during prolonged low-speed or high-load use and can extend pump and seal life when heat is a factor. Because it is a simple inline cooler with a medium core area, cooling is effective for daily driving and light-duty towing but may be modest compared with larger or multi-pass coolers. Installation is practical for a home mechanic but may require careful routing to avoid chafing or kinking of the lines.
Best for: Convenience-driven buyers who want a simple, low-effort upgrade to reduce steering fluid heat and prolong pump life without major modification.
Less Ideal for: Drivers who frequently do heavy towing, competitive driving, or need maximum multi-pass cooling should consider larger or purpose-built heavy-duty coolers instead.
- Compact core with expanded copper tubing and aluminum fins for efficient heat transfer
- Includes hose barb inlets and hardware for a straightforward installation
- Small footprint fits in tight spaces ahead of the radiator or condenser
- Helps lower steering fluid temperature to reduce pump and seal stress
- Cooling capacity is moderate and may be insufficient for heavy towing or extreme-duty use
- Does not include detailed vehicle-specific fitment instructions
Verdict: A compact, easy-to-install power steering cooler that reduces fluid temperature and helps extend pump life for everyday and light-duty use.
6. Derale 4-Pass Power Steering Cooler Kit
| Model | 4-Pass Power Steering Cooler |
|---|---|
| Manufacturer | Derale |
| Item model number | 13212 |
The Derale 4-Pass Power Steering Cooler Kit is a compact add-on cooler that uses 1/2 inch copper tubing expanded into aluminum fins to lower steering fluid temperature. It installs inline with the power steering hose using 11/32 inch hose barb inlets and is typically mounted where airflow can pass through the fins. In normal driving it reduces heat-related wear on the pump and seals, which can prolong component life during towing, spirited driving, or extended city traffic. The cooler’s 4-pass design increases fluid exposure to the fins for more efficient cooling than single-pass units while remaining lightweight and unobtrusive. Limitations include a basic kit-level fitment that may require custom hose routing or clamps for a clean installation on some vehicles and the need to locate the cooler where it receives adequate airflow to be effective. It is a straightforward, practical upgrade for reducing steering system temperatures without major modifications.
Best for: Balanced, all-round buyers who want a practical reliability upgrade to reduce power steering temperatures and extend component life without heavy modification.
Less Ideal for: Drivers looking for a bolt-in, vehicle-specific plumbing kit with dedicated brackets and fittings or those who cannot provide an airflow location for the cooler.
- 4-pass tubing design increases fluid exposure to cooling fins for better heat dissipation
- Copper tubing expanded into aluminum fins provides good thermal transfer
- Compact, lightweight kit that is easy to tuck into tight engine bays
- Helps extend pump and seal life by reducing fluid temperature during heavy use
- May require custom hose routing or additional fittings for a clean install on some vehicles
- Effectiveness depends on mounting location and available airflow
Verdict: A compact 4-pass cooler that lowers steering fluid temperatures to help extend pump and seal life with minimal space impact.
Choosing the Right Lexus IS Power Steering Cooler: Key Factors to Consider
Cooling Capacity
Cooling capacity determines how effectively a cooler reduces fluid temperature during demanding conditions. Higher capacity units typically feature larger core surface area or multi-pass designs that increase heat transfer.
When capacity is insufficient, fluid can remain elevated during prolonged load, which accelerates seal and pump wear. Consider the typical driving conditions you face and choose a cooler sized to handle the expected thermal load rather than one selected solely for compactness.
Fitment And Mounting Options
Correct fitment ensures the cooler can be installed without interfering with existing components. Mounting options vary from bracket-mounted radiator-style cores to direct-in-line tube-and-fin designs that attach to existing hose paths.
Assess available mounting points on your Lexus IS and look for coolers that offer adjustable brackets or multiple mounting orientations. A good fit reduces vibration and hose stress, which improves longevity and prevents leaks.
Hose And Fitting Compatibility
Compatible hose diameters and fittings are essential for a leak-free install and proper flow characteristics. Some coolers use common SAE sizes and include adapters or barb fittings, while others may require swapping hose ends.
Mismatched fittings can increase installation time and create weak points. Verify whether replacement hoses or adapters are needed and whether the kit includes crush washers, clamps, or flare fittings that match your vehicle's existing plumbing.
Material And Corrosion Resistance
Materials affect both thermal performance and longevity. Aluminum cores provide good heat transfer and are lightweight, while stainless steel fittings resist corrosion in wet or salted-road environments.
Check for protective coatings or anodizing that guard against oxidization. A durable finish and corrosion-resistant connectors reduce the chance of leaks and extend the cooler's service life under real-world exposure.
Installation Complexity
Installation complexity influences whether you can perform the job at home or need professional help. Some kits come with comprehensive mounting hardware and clear instructions, making them suitable for DIYers, while others require routing hoses through tight areas or temporarily removing trim.
Plan for fluid handling and bleeding after installation. Consider whether special tools are required and how long the job will take based on your mechanical experience.
Maintenance And Serviceability
Ease of maintenance matters for long-term performance. Look for coolers with serviceable fittings that allow you to inspect and replace hoses or flush the system without full disassembly.
Regular checks for leaks and securing clamps can prevent small issues from escalating. Choosing a cooler designed for straightforward servicing reduces downtime and simplifies troubleshooting if temperatures start to climb again.
How We Chose the Best Lexus IS Power Steering Cooler
We focused on options that offer reliable temperature reduction and secure fitment for the Lexus IS platform. Key evaluation criteria included cooling capacity under sustained load, physical fitment and mounting options for the vehicle, hose and fitting compatibility with OEM lines, and overall material durability against heat and road contaminants. We also considered installation complexity and whether common tools and basic mechanical skills are sufficient.Units were excluded if they required extensive chassis modification or bespoke plumbing beyond typical hose and clamp connections. We did not consider products that lacked clear compatibility information or that used materials prone to early corrosion. The result is a curated list emphasizing effective heat rejection, straightforward installation, and long-term serviceability.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Lexus IS needs a power steering cooler?
If steering fluid temperatures rise during extended idling, towing, or spirited driving, or if you notice a change in steering feel and fluid smell, heat may be degrading the system. Recurrent overheating, soft or noisy steering, and premature seal wear are signs that additional cooling could help. A temperature gauge or infrared thermometer on the fluid lines during heavy use can confirm elevated temperatures.
Can I install a power steering cooler myself on a Lexus IS?
Many cooler kits are designed for DIY installation and include brackets and fittings, but complexity varies. Basic installs that route and clamp hoses can be completed with common hand tools, while some setups require removing trim or routing lines through tight spaces. Be prepared to drain and refill the system and to bleed air for proper steering feel.
Will adding a cooler change steering feel or performance?
A well-sized cooler should not negatively affect steering feel when installed correctly. Proper hose diameter and secure fittings help maintain correct flow and pressure. However, improperly installed components or restrictive fittings can introduce issues, so follow fitment guidance and ensure flow is not impeded.
How often should I check or maintain a power steering cooler?
Inspect the cooler and its connections during routine maintenance intervals, such as every oil change or at least a few times per year. Look for signs of leaks, loose clamps, corrosion, or physical damage. Periodically check fluid condition and level, and flush the system per manufacturer recommendations if contamination or breakdown is suspected.
Are there different types of power steering coolers available?
Yes. Common types include radiator-style cores that mount to airflow areas, in-line tube-and-fin coolers that fit along existing hose runs, and stacked-plate or multi-pass units for higher capacity. Each type balances cooling performance, size, and installation complexity differently, so choose based on your vehicle packaging and thermal needs.
Conclusion
Prioritize cooling capacity, fitment, and hose compatibility when choosing a power steering cooler for a Lexus IS. These factors determine whether the unit will reduce operating temperatures effectively and integrate cleanly with the vehicle
Explore More:
- Check out all Lexus IS parts & accessories
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