Wrangler 1987-2006 (YJ / TJ)

Interested in purchasing our YJ/TJ electric fan setup? Check out more details on our product page linked below.

Mishimoto Jeep Wrangler YJ and TJ Performance Fan Shroud Kit

Quite the project this Jeep TJ electric fan shroud kit has been! We've gone through a few design iterations and conducted some pretty cool testing to ensure that our product will adequately cool both the 2.5L and the 4.0L.

Testing Results

The last portion of our article series showed the testing apparatus and our plans for extended idle testing with our Jeep TJ electric fan kit. We would be monitoring coolant temperatures to see the impact of an electric fan as opposed to a mechanical setup provided by the factory.

Testing Conditions

• Ambient temperature: 72°F
• Testing timeframe: 1400 seconds (23.3 minutes)
• Vehicle: Jeep Wrangler YJ 4.0L

First up, the results and plot for the stock mechanical fan.

Stock mechanical fan testing data

Inlet fluid temperatures hover at around 208°F with the stock fan at extended idle. Once

Interested in purchasing our YJ/TJ electric fan setup? Check out more details on our product page linked below.

Mishimoto Jeep Wrangler YJ and TJ Performance Fan Shroud Kit

Wrangler test vehicles in shop

Now that we had our initial shroud prototype prepared for testing, we installed it on the stock radiator and the Mishimoto aluminum radiator. We wanted to ensure that it fit perfectly and that it enclosed the full length and height of both radiator cores. Once complete, it was time to test the shroud within the engine bays of our test vehicles.

Mishimoto prototype installed on stock radiator

Jeep YJ Test Fitting

YJ test vehicle

First, we removed the stock mechanical fan.

Mechanical fan removed

Once the stock system was out of the way we dropped our prototype into position.

Mishimoto prototype installed

Mishimoto prototype installed

The electric fan was then bolted to the shroud.

Mishimoto prototype installed

On the 4.0L we need to pay close attention to the clearance between the water pump

Interested in purchasing our YJ/TJ electric fan setup? Check out more details on our product page linked below.

Mishimoto Jeep Wrangler YJ and TJ Performance Fan Shroud Kit

Jeep YJ in Mishimoto shop

Project Intro

After a few successful electric fan conversion projects, we chose yet another vehicle that could benefit from the removal of the stock clutch fan. Our previous endeavors involved BMWs that experienced frequent failures of the plastic stock clutch fan. After checking through potential applications and scouring the forums, our team chose the Wrangler as a prime subject for a reliable and efficient electric fan conversion kit.

Along with providing greater reliability, replacing the mechanical fan with an electric fan would reduce rotating mass and possibly free up a bit of power. Extra power is always welcome!

Stock Fan Setup

First, let's take a look at the stock fan setup equipped on both the Wrangler 4.0L and 2.5L vehicles. First up, the 4.0L.

YJ 4.0L stock engine bay

YJ 4.0L stock