What part number is the radiator on a Lexus IS250?

The radiator part number for a Lexus IS250 isn’t a single universal code; it varies by model year, market, engine configuration, and whether the car uses an automatic or manual transmission. To ensure you source the correct radiator, gather your vehicle’s exact details and consult official catalogs or a dealer.

Why the part number varies by year and market

Radiator assemblies can change across generations and regions. The IS250, produced from 2006 to around 2013 in many markets, used different radiator designs and fittings depending on the year, country, and optional equipment. This means a radiator for a U.S.-spec IS250 may not be interchangeable with a European-spec or Japanese-spec unit, even if the engine is the same.

• Different model years reflect design updates to the radiator, mounting points, and hose connections.


• Market-specific specifications (US, Europe, Japan, etc.) can require distinct part numbers.


• Engine and transmission variations (if any) influence cooling components and associated hardware.


• Replacement may involve the full radiator assembly or a core-only option, depending on the repair needs and availability.

Because of these variables, the exact radiator number is unique to your VIN and regional specifications. Always verify against official sources or by checking the VIN with a dealer.

How to identify the exact radiator part number

Follow these steps to locate and confirm the correct OEM radiator part number for your IS250.

1. Gather vehicle details: model year, market, engine code, and transmission type, plus the VIN.


2. Inspect the radiator itself for stamped identifiers on the inlet tank, core, or mounting area; look for a code beginning with typical OEM prefixes used by Lexus/Toyota (for example, a 16400-series number).


3. Consult official Lexus/Toyota catalogs or retailer sites by entering the year, market, and engine to locate the radiator assembly number; check related parts like the fan shroud and cooling fan if replacing as a package.


4. Cross-check with multiple parts retailers (OEM and high-quality aftermarket) by entering the VIN or exact year/region to confirm compatibility.


5. Confirm fitment before purchasing: verify mounting points, hose diameters, inlet/outlet locations, and any included hardware match your vehicle.


6. If in doubt, contact a Lexus dealer or authorized parts supplier with your VIN to obtain the precise part number and any superseded replacements.

With the correct part number in hand, you can source the radiator from a dealer, OEM supplier, or reputable aftermarket retailer with confidence.

Notes on verification and sourcing

VIN matters for accuracy

The VIN uniquely identifies the exact radiator variant your IS250 requires, accounting for regional manufacturing differences and updated part numbers.

OEM vs aftermarket considerations

OEM radiators typically guarantee fit and cooling performance for the IS250, while aftermarket options may offer cost savings but require careful verification of compatibility and warranty terms.

Summary

There is no single universal radiator part number for the Lexus IS250. The correct number depends on year, market, engine and transmission configuration, and specific vehicle hardware. Start with your VIN and exact vehicle details, then consult official Lexus/Toyota catalogs and reputable retailers to confirm the precise radiator part number before purchasing. This approach helps ensure proper fit, cooling efficiency, and long-term reliability.

How much does it cost to replace a radiator in a Lexus?

The cost to replace a Lexus radiator typically ranges from $450 to over $900, but can be significantly higher ($1,100 to over $2,000) depending on the specific model and dealership or independent shop rates. Factors like the complexity of the repair, the cost of parts (aftermarket vs. OEM), and labor rates will determine the final price. 
Factors affecting the cost

• Vehicle model: The specific make and model of your Lexus will influence the price. Some models may have a more complex radiator placement, requiring more labor. 
• Parts quality: The cost will vary depending on whether you use an economy, premium, or original equipment manufacturer (OEM) radiator. 
• Labor time: Radiator replacement labor costs can vary significantly. Some vehicles require more time to access and replace the radiator, which increases the total price. 
• Labor rates: Dealership labor rates are often higher than those at independent shops. You may be able to find a lower price at an independent mechanic or even a Toyota dealership. 

Tips to manage costs

• Get multiple quotes: Contact both dealerships and independent mechanics to compare prices before making a decision. 
• Compare parts: Ask about the cost difference between using an OEM part versus an aftermarket one. 
• Trustworthy shop: Find a reputable independent mechanic you trust. They might be able to perform the repair at a lower cost. 

How long do Lexus radiators last?

The radiator in your Lexus LS400 can typically last between 100,000 and 150,000 miles, depending on your every day driving conditions and regular maintenance.

What is the common issue with the Lexus IS 250?

Common problems with the Lexus IS250 include carbon buildup in the direct injection engine, which can lead to misfires and rough idling, and issues with the plastic dashboard material fading or becoming sticky. Other reported problems include various check engine light codes, a clicking noise from the rear suspension, and potential moisture damage to the amplifier or other electrical components due to clogged AC drain tubes.
 
This video discusses common problems with the Lexus IS250 and IS350, including engine issues and plastic degradation: 50sLife with SondurenYouTube · Apr 9, 2023
Engine and drivetrain 

• Carbon buildup: This is a frequent issue, especially on second-generation models, due to the direct injection system and frequent idling. It can cause misfires, check engine lights, and rough idling. 
• Check engine light: Specific codes like P0751, P2714, P0894, or misfire codes (P0300-P0306) are reported, often related to the carbon buildup issue or other engine problems. 
• Transmission problems: Some drivers report transmission issues like slipping, which can be caused by a lack of fluid maintenance. 

Interior and electrical

• Sticky/aging dashboard: The plastic material on the dashboard can become sticky or fade over time, sometimes unresolved by recalls. 
• Moisture damage: Clogged AC drain tubes can lead to water leaking onto the carpet, and moisture can also get into the amplifier, causing it to malfunction. 
• Old infotainment system: The original infotainment system is often outdated, with common complaints about glitches, such as the radio randomly shutting off. 
• GPS and radio issues: Some owners have reported issues with the navigation system, sometimes fixable by a software or map disc update. 

Other issues

• Rear suspension noise: A clicking noise from the rear suspension has been reported by multiple owners. 
• Safety issues: Some specific model years have had safety recalls and investigations, including for airbag and steering components. 

You can watch this video for a detailed discussion of potential issues when buying a used Lexus IS250: 55sMiguel's GarageYouTube · Jan 19, 2018

Are the coolant and radiator the same thing?

The coolant is a water-antifreeze mixture, and the radiator is a series of tubes and fins. The coolant prevents freezing and overheating of the engine, while the radiator disperses the excess heat. In essence, the coolant is the substance, and the radiator is the apparatus that controls the engine's temperature.