Trans coolers

[CrazyCooter]

If you want to keep all temps down, coolant, oil and trans install a RPM Extreme JL fan controller.
You will be amazed at how well it works keeping all temps down.
I have been running one for 3 years now and my coolant and oil temps are down by 25 to 30 degrees.
Your jeep has a transmission heater so you will always see temps about the same as the coolant.


A Mopar transmission heater (also known as a transmission warmer or heat exchanger) works as an oil-to-water thermal regulator. It circulates hot engine coolant through a series of passages directly adjacent to the transmission fluid to maintain optimal fluid temperature and viscosity. [1, 2, 3, 4, 5]

How It Operates

• Cold Starts & Warm-Up: When the engine is started in cold weather, the transmission fluid is thick, which causes sluggish shifting and increased wear. The heater uses the rapidly heating engine coolant to quickly warm the transmission fluid to its ideal operating temperature. [1, 2, 3, 4, 5]
• Thermal Bypass Valve (TBV): A built-in thermostat controls the flow. It directs transmission fluid through the heater until it reaches roughly 180°F (82°C). Once the fluid reaches this threshold, the TBV routes the fluid to the external transmission cooler to prevent overheating. [1, 2]
• Cooling Mode: If the transmission works hard and exceeds engine coolant temperatures, the heat exchanger works in reverse, allowing the cooler engine coolant to absorb excess heat from the transmission fluid to prevent it from overheating. [1, 2]

If you are experiencing issues with your transmission heater—such as a coolant leak, a check engine light, or harsh shifting in the cold—provide the model and year of your vehicle to help determine if the thermostat or heat exchanger needs to be

https://store.mopar.com/oem-parts/m...0PdLuwF91hQpZ3xquKYmrhPzDGXe8hj4aAgm5EALw_wcB

http://www.rpmextreme.com/Product/311/Jeep-JL-JT-PWM-FAN-CONTROLLER-.aspx

It appears as if RPM's controller still doesn't support 3.0 Diesel applications?

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[caryt]

Just use a Tazer ...

 

[willys 41]

How difficult is that to install, I am a busy wiring guy

I am assuming you mean the RPM fan controller.
Very easy. Just take your time and a lot of light to identify the correct wire colors.
I my case with old eyes a magnifying glass helps.

 

[willys 41]

It appears as if RPM's controller still doesn't support 3.0 Diesel applications?

Maybe not yet. Put he may be working on it. I was the first one he maid one for the jeep JL.

 

[willys 41]

Just use a Tazer ...

The tazer is not the same.
RPM Controller. I have never hit the 212°F / 100°C = 75% fan speed. The controller works that well.
Example Fan Speeds by Temperature:

• 195°F / 90°C = 15%
• 199°F / 93°C = 30%
• 205°F / 96°C = 50%
• 212°F / 100°C = 75%
• 218°F / 103°C = 100%

 

[caryt]

Never said its the same, I control the Tazer plus does many other things. I live at 5kft and have 6+* roads everywhere and we get in the high 90's all summer. Even with the fan on high oil temps get over 230++
Water temps never been a issue its oil temps.
$325 for something that does 1 thing vs a Tazer mini for under $280..such a deal.

 

[willys 41]

Never said its the same, I control the Tazer plus does many other things. I live at 5kft and have 6+* roads everywhere and we get in the high 90's all summer. Even with the fan on high oil temps get over 230++
Water temps never been a issue its oil temps.
$325 for something that does 1 thing vs a Tazer mini for under $280..such a deal.

I have both. Tazer and RPM controller on both my wranglers. Its a win win for me.

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