Key Performance Benefits
- Up to 30% improved cooling efficiency: Mishimoto advertises cooling improvements of up to 30%, depending on operating conditions and the original cooling system.
- Dual-row aluminum core: Provides increased cooling capacity and efficient heat transfer.
- TIG-welded aluminum construction: Eliminates the plastic end tanks commonly found on factory-style replacement radiators.
- Direct-fit design: Engineered for compatible Nissan Sentra SR20 applications without requiring a custom radiator conversion.
- 1.3-bar radiator cap: Includes a high-pressure cap designed for the radiator.
- Magnetic drain plug: Helps collect circulating ferrous particles during cooling system maintenance.
- Mishimoto Lifetime Warranty: Backed by Mishimoto’s warranty program, subject to its terms.
For SR20 enthusiasts who want improved cooling performance without sacrificing a factory-style installation, this radiator offers a practical upgrade.
Built for the Nissan SR20 Performance Platform
Nissan’s SR20 engine remains a favorite among Japanese performance enthusiasts thanks to its durable architecture, responsive power delivery, and extensive aftermarket support.
Whether your Sentra is naturally aspirated or modified for additional horsepower, controlling coolant temperature is critical to maintaining consistent engine performance.
Excessive coolant temperatures can contribute to detonation risk, reduced engine performance, and accelerated deterioration of cooling system components.
The Mishimoto MMRAD-SEN-91SR uses a high-efficiency aluminum core designed to transfer heat from circulating engine coolant into the airflow passing through the radiator.
Its polished aluminum end tanks also provide a clean, performance-oriented appearance under the hood. Learn more about cooling and radiators using our Complete Car Cooling System Guide.
An Ideal Upgrade for Aging Sentra Cooling Systems
If your Nissan Sentra is experiencing elevated coolant temperatures, unexplained coolant loss, or visible radiator corrosion, replacing the radiator may be part of the solution.
However, overheating can also result from a failing thermostat, damaged radiator hoses, an inoperative cooling fan, or trapped air in the cooling system.
Before replacing components, inspect the complete cooling system to identify the actual cause of the problem.
Mishimoto MMRAD-SEN-91SR Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Mishimoto |
| Part Number | MMRAD-SEN-91SR |
| Product Type | Performance Aluminum Radiator |
| Vehicle Application | Nissan Sentra SE-R SR20, 1991–1999 (verify fitment) |
| Construction | Aluminum core and TIG-welded aluminum tanks |
| Core Configuration | Dual-row |
| Overall Dimensions | 26.4 × 17.2 × 2.07 inches |
| Core Dimensions | 12.44 × 25.51 inches |
| Core Thickness | 1.57 inches |
| Inlet Diameter | 1.38 inches |
| Outlet Diameter | 1.38 inches |
| Tank Wall Thickness | 0.08 inches |
| Radiator Cap | 1.3 bar, included |
| Drain Plug | Magnetic |
| Warranty | Mishimoto Lifetime Warranty |
Fitment note: Verify your vehicle’s model year, SR20 engine configuration, transmission, mounting points, and cooling fan clearance before ordering. Not every 1991–1999 Nissan Sentra uses the same radiator.
How to Install a Mishimoto Aluminum Radiator on a Nissan Sentra SE-R
One of the biggest advantages of the Mishimoto MMRAD-SEN-91SR is its direct-fit design for supported applications.
Although installation is straightforward for an experienced DIY mechanic, proper coolant handling and system bleeding are essential. Do you have a coolant leak? Find it using this guide – How to Find a Coolant Leak
Step 1: Drain the Existing Coolant
Allow the engine to cool completely before opening the cooling system.
Place a suitable drain pan beneath the radiator and drain the existing coolant according to the factory service procedure.
Never remove a radiator cap while the cooling system is hot or pressurized.
Step 2: Remove the Factory Radiator
Disconnect the upper and lower radiator hoses, remove the cooling fan assembly as required, and disconnect any electrical connectors or brackets preventing radiator removal.
Inspect the radiator mounting bushings and surrounding components for deterioration. How to Pressure Test a Cooling System if you need to pressure test your radiator.
Step 3: Install the Mishimoto Radiator
Position the new Mishimoto aluminum radiator into the factory mounting locations.
Confirm that the mounting points align correctly and that the radiator does not contact nearby components.
Transfer compatible cooling fan hardware and mounting components as required.
Step 4: Inspect the Cooling System
Before reconnecting everything, inspect the radiator hoses, hose clamps, thermostat housing, and cooling fan assembly.
Replacing deteriorated cooling components during a radiator installation can help prevent future leaks and overheating.
Step 5: Refill and Bleed the Cooling System
Refill the cooling system using coolant that meets Nissan’s specifications.
Follow the factory bleeding procedure to remove trapped air, verify thermostat operation, and confirm that the cooling fans activate correctly.
Finally, inspect all connections for leaks and verify proper operating temperature.
DIY tip: A cooling system pressure test after installation can help identify small leaks before they become expensive problems.
Complete Your SR20 Cooling System Upgrade
A performance radiator works best when the rest of the cooling system is in good condition.
When upgrading your Nissan Sentra SE-R radiator, consider inspecting or replacing these supporting components:
Radiator Hoses: Aging rubber hoses can soften, swell, or crack. Quality replacement hoses help maintain reliable coolant circulation.
Thermostat: A properly functioning thermostat regulates coolant flow and helps the engine reach its intended operating temperature.
Cooling Fans: Confirm that the electric fans operate correctly and that airflow through the radiator is unobstructed.
Radiator Cap: The included Mishimoto 1.3-bar cap helps maintain the radiator’s designed pressure rating. Confirm compatibility with the rest of the cooling system.
Engine Coolant: Fresh, manufacturer-approved coolant protects aluminum components against corrosion and helps maintain efficient heat transfer.
Explore additional cooling system components and performance upgrades at Pro Street Online.
Is the Mishimoto MMRAD-SEN-91SR Worth It?
For Nissan Sentra SE-R enthusiasts who plan to keep their SR20-powered vehicles on the road, an upgraded aluminum radiator can be a worthwhile investment.
Compared with an aging factory radiator, the Mishimoto offers durable aluminum construction, increased cooling capability, and a direct-fit design that simplifies installation.
It is especially appealing for drivers restoring older Nissan performance cars or building vehicles that experience greater-than-stock cooling demands.
While a radiator upgrade will not automatically increase horsepower, maintaining stable operating temperatures helps support reliable engine performance.
Upgrade Your Nissan Sentra Cooling System with Pro Street Online
Don’t wait for an aging radiator to leave your SR20-powered Sentra overheating on the side of the road.
The Mishimoto MMRAD-SEN-91SR Performance Aluminum Radiator combines dual-row aluminum cooling technology, TIG-welded construction, and factory-style fitment for a dependable performance upgrade.
Whether you’re restoring a classic Sentra SE-R or improving your SR20’s cooling system, Mishimoto delivers a purpose-built solution.
Shop performance radiators, replacement cooling components, and Nissan SR20 upgrades at www.ProStreetOnline.com.
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