Novak Heavy Duty Radiator


2007-2018 JK Jeeps

This is the innovative Novak HD JK Wrangler radiator for GM Gen III+ conversion engines in 2007-2018 JK Series Jeeps.

Jeep JK Wrangler Conversion Radiator

#K-JK30H, Radiator, KryoFlow II, Jeep JK Wrangler with GM Gen III/IV Engines. Aluminum, high-efficiency crossflow. TP/BP

Kit contents:

  • Radiator assembly
  • Cap, 16psi
  • Fittings
  • Plugs
  • Instructions

The cross-flow design radiator is manufactured from aluminum which has proven to be a much lighter, stronger and more efficient radiator cooling material. Tanks are CNC laser cut, bent and fabricated with billet aluminum fittings. The core features a single row of 1-1/2" wide tubes utilizing maximum fin density with louvered fins for optimal cooling capacity. These assemblies are TIG welded with the finest craftsmanship and pressure tested to exceed even high-pressure systems. Our radiators are designed to facilitate the maximum amount of cooling possible in a narrow Jeep grille.

Why a single row radiator? Through extensive in-house testing of past designs, and other leading competitors' radiators, we found the widest possible single row of maximum row density to be the most efficient. With multi row radiators, airflow becomes turbulent between rows, decreasing airflow and in turn decreasing efficiency. We are confident this is one of the best conversion radiators on the market.

Recommended Fan & Controller

Factory JK Fan

The 2012-2018 OEM JK Pentastar fan delivers terrific airflow and slides directly into the mounting tabs of our JK radiator. This was an important upgrade in power and reliability for Jeep over even the previous JK electric fan. See Related Products, below. It's watertight, durable, efficient, and most importantly: variable speed. As the engine begins to heat up, the fan slowly increases speed to deliver exactly as much cooling as needed. This in turn puts less stress on your electrical system and keeps the engine bay from heat soaking in between standard fan cycles. With lower under hood temps, sensors, hoses, gaskets and various other components lives are extended, improving the reliability of your Jeep.

If you have a 2007-2011 model radiator fan, we recommend sourcing a 2012-2018 JK Pentastar fan instead. To identify what fan you have, the 2007-2011 fans use a purple signal wire, while the 2012-2018 fans use a green activation wire.

In order to run the 2012-2018 JK Pentastar fan, we recommend Novak's E-PWM controller. Historically, engine fans would run at 100% or off, causing them to constantly cycle on and off, sending the engine through countless heat cycles and putting a heavy draw on your vehicles electrical system.

JK Pentastar fan controller E-PWM
#E-PWM fan controller for 2012-2018 JK PWM electric fan units. See Related Products, below.

Getting this fan to run standalone has been made easy with Novak's E-PWM JK fan controller. The fan will only work when a specific PWM signal is input through its green signal wire, usually supplied via the JK's TIMP. Novak's E-PWM controller takes the engine temperature from a standard GM temp sender and creates this specific signal to run the Pentastar fan exactly how your GM engine requests.

The E-PWM also comes with low and high speed command wires that can be used with selectable 0v or 12v signals. These are commonly used for A/C fan activation or dash switches to manually override fan speeds.

Radiator Mounting

JK Rad Mount

The Stock JK radiator mounting system a good design and the Novak JK radiator drops right into the factory JK chassis for a plug and play solution.

Transmission Cooling

Transmission cooler lines

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 Related Products, below.

Related Products

JK Pentastar fan 2012+
PWM Jeep Mopar fan controller for GM conversions in JK 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