Novak Heavy Duty Radiator

for

1987-2001 XJ / MJ Jeeps

Jeep Radiator & Fan Assembly
Our optional high powered integrated fan and shroud married directly to our radiator.

Novak's HD cross-flow radiator for 1987 - 2001 Jeep CJ's is made to be the most innovative on the Jeep aftermarket. Jeep engine swappers have the challenge of keeping more powerful engines cool within the confines of one of the smallest grill spaces in the automotive industry.

These radiators are fabricated in-house at Novak since 2012, where we have relentlessly pursued radiators which have:

  • Maximum heat exchange with one 1-1/2" wide tubes in alloy aluminum
  • Durability
  • Unmatched features; each radiator assembly includes:
    • Floating design on pads within the Jeeps framework
    • Industry standard inline filler neck and radiator cap, for easy future replacement
    • Standard drain fitting, accessible with a wrench
    • Sacrificial anode (however, you should still ground your radiator to prevent corrosion!)
    • Simple, barbed overflow fitting
    • Bungs for temperature senders and steam ports
    • Ideal fin density with louvers
    • Furnace brazed headers and TIG welded final assembly
    • Every radiator pressure tested, heat imaged and empirically scored for maxium heat exchange

Our radiators do not feature integrated transmission coolers, as we choose to focus the unit's entire cooling power on the engine. More on this, below.

Fan/shroud assemblies ordered with the radiator come pre-assembled for a "drop-in" package saving substantial time on your part.

For Generation I-II Chevrolet Engines

#K-XJ11H, Radiator, KryoFlow HD, Jeep XJ & MJ 1987-2001 with GM Gen I-II engines. Aluminum, high-efficiency crossflow, TD/BP

Kit contents:

  • Radiator
  • Radiator cap, 16lb
  • Filler, inline filler neck
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Anode, sacrificial

The classic Small Block Chevy version of our radiator features the 1-1/2" diameter top inlet on the driver's side and the lower 1-5/8" outlet on the passenger's side.

Chevrolet V8 SBC

Need engine mounts for this swap?

For Generation III+ Chevrolet Engines

#K-XJ31H, Radiator, KryoFlow HD, Jeep XJ & MJ 1987-2001 with GM Gen III engines. Aluminum, high-efficiency dual pass, crossflow, TP/BP

Kit contents:

  • Radiator
  • Radiator cap, 16lb
  • Filler, inline filler neck
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Anode, sacrificial

The LS version of our radiator features a 1-1/2" diameter top inlet on the passenger's side and the lower 1-3/8" outlet on the passenger's side.

GM LS Vortec Engine

Need engine mounts for this swap?

For Ford Small Block V8 & AMC V8 Engines

#K-XJ21H, Radiator, KryoFlow HD, Jeep XJ & MJ 1987-2001 with AMC/Ford engines. Aluminum, high-efficiency crossflow, TP/BD

Kit contents:

  • Radiator
  • Radiator cap, 16lb
  • Filler, inline filler neck
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Anode, sacrificial

The Ford & AMC version of our radiator features a 1-1/2" diameter top inlet on the passenger's side and the lower 1-5/8" outlet on the driver's side.

Ford V8 Engine

More Details

Integrated Auto Transmission Coolers?

Because modern engines run a bit hotter than earlier engines and automatic transmissions prefer to be kept at cooler temperatures, we at Novak have decided to offer radiators without an integrated automatic transmission cooler option. These coolers are more effective run as separate units. This is a method that is confirmed by trends in the OEM automotive industry. See our preferred transmission cooler in Related Products, below.

1984-1986 Versions

These assemblies are designed to fit the 1987 to 2001 XJ / MJ models with engine conversions appropriate to the radiator selected. 1984 to 1986 XJ's feature a grill support assembly that is not will not work with this radiator (nor V8 engine conversions, for that matter) and will require that the installer fit the later style front structure and radiator support from a salvage Cherokee for this radiator and the conversion to succeed.

Eliminating the Remote Fill Bottle

For 1984 to 1996 Cherokees which currently feature the remote fill pressure bottle, this new radiator will convert you to the improved system that places the filler neck in the upper radiator hose. Your engine bay will be less cluttered, simplified and there is less risk of engine damage due to due to air pockets inherent to the complexity and design flaws of the earlier systems. The elimination of this headache will be welcomed along with increased reliability of the Jeep's cooling system.

Fan Options

Cooling fan for Jeep V8 radiator

This is only compatible with electric fans. We recommend our FX Series Electric Fan which combines three high-powered fans and integrated shroud into one effective package, available in Related Products, below.

If you order your fan at the time of your radiator order, we will join them together for you and package them for combined shipment.

Related Products


Electric cooling fan for XJ Jeeps
Auto transmission cooler
Stainless coolant overflow tank

Installation Requirements

Typical mechanics hand tools along with the appropriate hoses, clamps and coolant required with a normal radiator swap. After installing this upgrade radiator, we recommend that the installer should verify fan-to-radiator clearance and engine mount integrity before operating the Jeep.

Radiator Warranty Policy

Our radiators come with a 1-year / 100% warranty for defects in materials or workmanship, which is prorated and Novak will cover the cost as follows:

  • 1 year, 100%
  • 2 years, 75%
  • 3 years, 50%
  • 4 years, 25%

The above does not include incoming shipping of your radiator to Novak.

Coverage can be denied if it is determined that:

  • Abuse has occured; no radiator can withstand shoddy installation or debris striking the radiator
  • Electrolysis has occurred due to failure to ground the radiator to the frame
  • Overpressured. We do not recommend exceeding 16psi on the cap

Our overall warranty and other policies are found here. We strongly recommend you educate yourself about cooling and the related topics here before taking on this or any custom vehicle cooling project.

Also See