ISR Performance Aluminum Radiator - Nissan 240sx S13 89-94 KA24

The ISR Performance Aluminum Radiator is a TIG welded lightweight aluminum performance radiator for the 1989-1994 Nissan 240SX (S13) with the factory KA24 engine. Direct drop-in upgrade with hose fittings positioned for factory KA24 routing in the S13 chassis. A cost-effective alternative to premium aluminum radiator brands while delivering comparable cooling performance.

What It Does

The factory S13 KA24 radiator is a plastic-tank aluminum-core design that's been heat-cycling for over 30 years on most still-running cars. The tanks crack, the core gets blocked, and cooling performance falls off noticeably. This all-aluminum TIG welded replacement fixes those failure modes while providing better thermal capacity for KA24-T builds, KA24DE-DET conversions, and KA24s running aggressive timing or boost.

Comparable in size and cooling capacity to premium options like Koyo at a significantly lower price. Direct drop-in fit on the S13 chassis when running the factory KA24DE engine.

Critical Fitment Note

This radiator is built for the S13 chassis with the KA24 engine. The hose fitting positions are sized for the factory KA24 layout. For SR20DET-swapped S13 builds, use the SR20DET-specific S13 radiator (IS-240SR-RADS13), since SR20DET swaps reposition the hose connections.

Fitment

• 1989-1994 Nissan 240SX (S13) with KA24 engine (KA24E and KA24DE)

Best Paired With a Fan Shroud Kit

For the best cooling results, pair this radiator with an aftermarket dual electric fan shroud kit sized to match the radiator.

What's in the Box

• 1x ISR Performance aluminum radiator (S13 KA24 fitment)

Product Details

Brand: ISR Performance

Part Number: IS-240KA-RADS13

Type: Performance Aluminum Radiator

Vehicle Fitment: 1989-1994 Nissan 240SX (S13) with factory KA24 engine

Engine Restriction: KA24 (E and DE) - use IS-240SR-RADS13 for SR20DET-swapped builds

Material: TIG welded aluminum

Comparable To: Koyo and similar premium aluminum radiators

Installation: Direct drop-in upgrade

Application: Daily-driven KA24 S13 through KA24-T and competition use

Recommended Pairing: Dual electric fan shroud kit

Sold: Individually

Legality: Off-road and competition use only