Best option for enhancing 2.0 cooling?

[rpmextreme]

Ultimately the fan controller at the moment is the best choice however being 300+ bucks and requiring splicing into the main harness is a huge turn off for me. I’d rather just tune the ECU when that ability becomes available to us.

The problem is mainly when the fan kicks into high gear. It doesn’t really get going till 195 and doesn’t operate at 100 percent until 225+ which I think is a bit too late

Tuning is available now thru a HP Tuners device and maybe some handheld tuning devices, But you will need to send the ECU out to be "unlocked" or purchase an unlocked ECU. This adds a lot of cost. Also, even after "tuned" the fan still will not operate at the temp of the rpmextreme pwm fan controller. The factory calibrations in the tune are limited in what changes you can make. Also, if you ever take it in to the dealer can tell if the ECU has been "tuned"and they may flash it back to stock or do a ECU calibration update and wipe out the tune. With the fan controller, the dealer won't know its there unless they are looking for it and it will still operate even if they reflash the ECU.

Splicing in the fan controller is not as bad as it seems. When done properly it will be hardly noticeable and keep the engine much cooler and possibly help with engine oil wear and oil blow-by. most guys running the controller that have a oil catch can say they see a huge decrease in the amount of oil in the can.

Just food for thought.

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[Bdoza10]

Tuning is available now thru a HP Tuners device and maybe some handheld tuning devices, But you will need to send the ECU out to be "unlocked" or purchase an unlocked ECU. This adds a lot of cost. Also, even after "tuned" the fan still will not operate at the temp of the rpmextreme pwm fan controller. The factory calibrations in the tune are limited in what changes you can make. Also, if you ever take it in to the dealer can tell if the ECU has been "tuned"and they may flash it back to stock or do a ECU calibration update and wipe out the tune. With the fan controller, the dealer won't know its there unless they are looking for it and it will still operate even if they reflash the ECU.

Splicing in the fan controller is not as bad as it seems. When done properly it will be hardly noticeable and keep the engine much cooler and possibly help with engine oil wear and oil blow-by. most guys running the controller that have a oil catch can say they see a huge decrease in the amount of oil in the can.

Just food for thought.

Thank you for the reply. I’ve got one in the cart rn. We’re definitely on the fringe end of use case for our jeep. It gets put through a lot.

 

[Catiajockey]

I always like to remind people that taking your grill off and cleaning through your condenser and radiator occasionally helps a lot. You will be shocked at how much gets rinsed out. it is zero cost maintenance.

 

[Bdoza10]

I appreciate the suggestion to clean the radiators. Man were they filthy and packed full of bugs and rocks.

I also went a bit ham and moved the horns out of the way. Who knows how much it mattered, but it was under hour of work and pretty simple.

Just requires some fancy foot work getting the bolts out for the passenger side mounting bracket. I decided it wasn’t worth the effort on the drivers side and just unbolted the horn.
I then split the harness to the air temp sensor and the horns to give me some slack so I could find a spot to mount the horns.

I I was able to reuse one bracket and it bolted right up to the air intake.
The other one I made out of a curtain rod hanger I had laying around.

The horns are super light so I’m not terribly concerned about them messing with anything and the routing honestly feels factory with how the wiring just worked out.

 

[bmpcamry09]

Tuning is available now thru a HP Tuners device and maybe some handheld tuning devices, But you will need to send the ECU out to be "unlocked" or purchase an unlocked ECU. This adds a lot of cost. Also, even after "tuned" the fan still will not operate at the temp of the rpmextreme pwm fan controller. The factory calibrations in the tune are limited in what changes you can make. Also, if you ever take it in to the dealer can tell if the ECU has been "tuned"and they may flash it back to stock or do a ECU calibration update and wipe out the tune. With the fan controller, the dealer won't know its there unless they are looking for it and it will still operate even if they reflash the ECU.

Splicing in the fan controller is not as bad as it seems. When done properly it will be hardly noticeable and keep the engine much cooler and possibly help with engine oil wear and oil blow-by. most guys running the controller that have a oil catch can say they see a huge decrease in the amount of oil in the can.

Just food for thought.

Tuning is available now thru a HP Tuners device and maybe some handheld tuning devices, But you will need to send the ECU out to be "unlocked" or purchase an unlocked ECU. This adds a lot of cost. Also, even after "tuned" the fan still will not operate at the temp of the rpmextreme pwm fan controller. The factory calibrations in the tune are limited in what changes you can make. Also, if you ever take it in to the dealer can tell if the ECU has been "tuned"and they may flash it back to stock or do a ECU calibration update and wipe out the tune. With the fan controller, the dealer won't know its there unless they are looking for it and it will still operate even if they reflash the ECU.

Splicing in the fan controller is not as bad as it seems. When done properly it will be hardly noticeable and keep the engine much cooler and possibly help with engine oil wear and oil blow-by. most guys running the controller that have a oil catch can say they see a huge decrease in the amount of oil in the can.

Just food for thought.

You are wrong in saying the dealer can tell if you’re tuned. Unless your dealer tech is keeping track of PCM flash count. As a former Jeep tech, I can confidently tell you they don’t care. That is completely and utterly false. P1400 can be disabled in the tuning and leave no trace behind. And HP Tuners VCM Scanner has the ability to command fan to 100 percent and no timer also. The only part of tuning that is limited right now is getting the fans to consistently turn on below about 194. I have several tickets turned in with HP Tuners to get this fixed.

You guys sell a great product and I have referred several customers to you, but to scare people away from tuning thinking the dealer can tell is just wrong. And with HP Tuners you can reflash a tune if the dealer updates your OS. It’s no big deal at all.

 

[rpmextreme]

You are wrong in saying the dealer can tell if you’re tuned. Unless your dealer tech is keeping track of PCM flash count. As a former Jeep tech, I can confidently tell you they don’t care. That is completely and utterly false. P1400 can be disabled in the tuning and leave no trace behind. And HP Tuners VCM Scanner has the ability to command fan to 100 percent and no timer also. The only part of tuning that is limited right now is getting the fans to consistently turn on below about 194. I have several tickets turned in with HP Tuners to get this fixed.

You guys sell a great product and I have referred several customers to you, but to scare people away from tuning thinking the dealer can tell is just wrong. And with HP Tuners you can reflash a tune if the dealer updates your OS. It’s no big deal at all.

Im not sure when the last time you worked at a Jeep dealer, but from what I have seen. As soon as they plug the vehicle in, the system scans the entire thing and will throw a notification on the screen if any calibrations are not stock or need updated. There may be a way around this, I don't know. Either way, the dealer can easily flash a factory calibration into it and wipe out the custom tune. Also with HP tuners, I doubt most people want to be driving around everyday with a Laptop hooked up just so they can command the fan to max speed. Im sure there are several ways to keep the engine cooler and the fans running at better speeds, our module is just one of the options and once installed you don't have to mess with anything else. It's just an option.

 

[Penguin07]

I appreciate the suggestion to clean the radiators. Man were they filthy and packed full of bugs and rocks.

I also went a bit ham and moved the horns out of the way. Who knows how much it mattered, but it was under hour of work and pretty simple.

Just requires some fancy foot work getting the bolts out for the passenger side mounting bracket. I decided it wasn’t worth the effort on the drivers side and just unbolted the horn.
I then split the harness to the air temp sensor and the horns to give me some slack so I could find a spot to mount the horns.

I I was able to reuse one bracket and it bolted right up to the air intake.
The other one I made out of a curtain rod hanger I had laying around.

The horns are super light so I’m not terribly concerned about them messing with anything and the routing honestly feels factory with how the wiring just worked out.

Is it the pic or is the viewing tube on your coolant tank actually bent like that? I remember I considered that but Amazon reviews said that the viewing thing leaks easily, but some people mentioned being able to remedy that by fabbing up their own gaskets and such.

 

[bmpcamry09]

Im not sure when the last time you worked at a Jeep dealer, but from what I have seen. As soon as they plug the vehicle in, the system scans the entire thing and will throw a notification on the screen if any calibrations are not stock or need updated. There may be a way around this, I don't know. Either way, the dealer can easily flash a factory calibration into it and wipe out the custom tune. Also with HP tuners, I doubt most people want to be driving around everyday with a Laptop hooked up just so they can command the fan to max speed. Im sure there are several ways to keep the engine cooler and the fans running at better speeds, our module is just one of the options and once installed you don't have to mess with anything else. It's just an option.

There is a way around it, that’s what I’m saying lol

I was a tech and service manager until 2022ish. Using the latest WiTech system that is still used today. When plugging WiTech in, on calibrations that have P1400 enabled (GPEC2A models, Hellcats, Chargers) then yes, they can see.

But I disable this code on my files as do most other calibrators. The newer GPEC5 models don’t even have this code enabled. The dealer would still have to prove tuning caused the failure per Magnuson Moss.

It’s no different than your customers asking if installing this cooling fan mod voids warranty. Dealer would have to prove your controller caused the failure.

I agree that your option right now is the best option available and I recommend it to many people. I just didn’t agree with some of the tuning stuff. That’s all

 

[Matt878]

My 2026 is arriving soon, it has the new steel hood. I plan on making the hood scoop functional.

if you have a rubicon with the older hood I know it can be done for that as well. Drilling holes into the plastic plate that is there.

That will cool the engine bay a great deal since the hot air will rise right out of the vents

 

[croppz]

My 2026 is arriving soon, it has the new steel hood. I plan on making the hood scoop functional.

if you have a rubicon with the older hood I know it can be done for that as well. Drilling holes into the plastic plate that is there.

That will cool the engine bay a great deal since the hot air will rise right out of the vents

Yup. Stole this pic from a guy on FB. Two jeeps. Both 2.0s after the same drive. Definitely lets a good bit of heat out. Opening mine up has helped quite a bit

 

[Wes1980]

S&B Filters Air Hood Scoop System.

directs “cold” air to the air filter and second location above turbo area.

easy never fail option. No wires. No tuning.

 

[croppz]

S&B Filters Air Hood Scoop System.

directs “cold” air to the air filter and second location above turbo area.

easy never fail option. No wires. No tuning.

Yeah except it looks like you drove down the stick on vent aisle at autozone. The stock rubicon vents are ricey enough as it is

 

[zouch]

just curious; have you NOT been using the AC while out in the Dez?

i set mine on Auto, pick a a temperature, and leave it there to do its thing. works well enough (especially above crawling speeds) and i rarely see the kinds of engine temps some folks are complaining about even with our diesel.

We went in trail tested those last night and yes running the AC does help brought us down from 225 to 210

 

[oceanblue2019]

just curious; have you NOT been using the AC while out in the Dez?

i set mine on Auto, pick a a temperature, and leave it there to do its thing. works well enough (especially above crawling speeds) and i rarely see the kinds of engine temps some folks are complaining about even with our diesel.

I live in Arizona. We were out last weekend at 100F temps, Jeep never gets above 205F or so with the AC on. With it off I will see 215F.

It would be good to hear from one of the tuners but it certainly seems that having the AC on forces the ECU into being far more aggressive with the cooling fan getting to 100%.

 

[bmpcamry09]

I live in Arizona. We were out last weekend at 100F temps, Jeep never gets above 205F or so with the AC on. With it off I will see 215F.

It would be good to hear from one of the tuners but it certainly seems that having the AC on forces the ECU into being far more aggressive with the cooling fan getting to 100%.

Tuner here correct. AC use forces the fan on for airflow over the condenser. There are high side air conditioning pressure points within the tune that determine the PWM (pulse width modulation) signal, or basically, power level, to the fan. Hot weather=higher fan speeds when AC is on. Coolant temp is another variable, but from the factory, if you were to leave AC off, most calibrations don’t kick on the cooling fan until 217-219 degrees.

I reduce this to 205-207 on all my tunes now. Newer models don’t even have the cooling fan maps set up properly through the tuning software and I have to make custom fan maps to get them to work correctly.

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