Possible Engine Coolant Temperature (ECT) Gauge Malfunction May Have Caused Engine Block Warp

[Willys41]

I know what I have to say doesn't pertain to your situation put is what I have found on the Wrangler JL cooling system
I am running 37in. tires 4.88 gears and about 1200lb of upgrades and gear
3.6 automatic trans

For the last 3 months
Here is what I discovered and what I am working on
This is how the cooling system works or not working
The thermostat opens at 190 degrees
The cooling fans comes on at 1/4 speed at 221 and will only go fulls speed at 231 degrees
I have been trying to get control of the cooling system by adding a pusher fan on the condenser put this is what I found
Most cars including the jeep JK the condenser is mounted 1/4 to 1/2 in. from the radiator
On the Jeep JL the condenser is about 1 1/2 in. away from the radiator
I can get the pusher fan to shoot air though the condenser at 150 MPH put as soon as it hit the radiator the air blows out the large gaps between the condenser and radiator and NO air going through the radiator
Next step was to close the caps between the condenser and radiator to force the air through the radiator
So now with the gaps closed off I have about 15% of the air going through the radiator and the rest of the air is blowing back though the condenser and trans cooler
Two things wrong here. The gap between the condenser is to large and the radiator WILL NOT allow free flowing air to pass through it whether you are pushing air at 150 mph with a fan or diving down the road at 60 /70 mph and that is why you see a 30 to 40 degree swing in the coolant temps. You would thing driving down the road you are getting air passing through the radiator put you are getting very little to none until the fan kicks in and sucking the air through the radiator
I ordered a Mishimoto radiator it looks to have a more open core that will allow more free flowing air to pass through
I will install the Mishimoto and see how it goes
And NO. The radiator is not plugged in any way inside or out side. The jeep did this from day one . New in 2020
The Engineers got this one wrong and they know it from what I have read
READ THIS
https://jalopnik.com/the-engineering-behind-the-jeep-gladiators-tow-rating-1833657453

UPDATE
The Mishimoto radiator made no difference in lowering the temperature
Step 2
Just installed the Rpmextreme JEEP JL PWM FAN CONTROLLER
This is a game changer . Here is how your fan will work with this device


Operation:

When the engine is running the PWM fan will run at a low Idle speed (15%).
When the module reads the engine temp it will command the fan to the desired %.

Fahrenheit

199 degrees = 30%

205 degrees = 50%

212 degrees = 75%

218+ degrees = 100%

Override inputs: These are optional inputs depending on if you ordered them.

These inputs will run the fan as long as the unit is powered up, the engine does not have to be running for these to work. You can use these in various ways.

Example:
When the ( VIOLET ) wire has 12 volts applied the fan will run at MAX speed.

UPDATE 9/15/23
I have only three days of testing put my temps now run 188 to 192 at idle all day long
Normal driving I see 192 to 195 and 199 to 205 under hard acceleration put drops down real fast
Also my oil temps are about 20 degrees lower mainly because the the engine is running cooler and now I have constant air movement over the oil cooler
This weekend I will be testing on a long up hill drive put I suspect of 215

UPDATE 9/23/23

Just got back from a trip to Lake Tahoe from the bay aria

Going up high way 80 from Auburn to Truckee at 65-70 mph the coolant topped out at 212 degrees / Trans 206 / oil 221 at 75% fan speed

As soon as I hit the top of any hill the coolant temp would fall to 188 to 192 within 1 minute followed by the oil and trans temps

I also spent about 6 hours on the Rubicon trail and my coolant temp never went above 201
Most of the time the swing in temps was 199 to 197
It was the sweet sound of the fan kicking in at 199 keeping the temps down at 30% fan speed
So far it has not got to 218 degrees and 100% fan speed


The last trip to Tahoe about a month ago my coolant temps would hit 221 on any little hill and hit 231 or higher on the larger hills
On the Rubicon trail the temps constantly hit 221 and then drop down to 215 and back up

Rpmextreme JEEP JL PWM FAN CONTROLLER has made a big difference in keeping air moving though the radiator and keeping my jeep running cooler

A PWM FAN CONTROLLER is nothing new. these are out there for other cars /trucks and motorcycles

Jon has programed these just for the jeep JK &JL

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


info
Jon Schaefer RpmExtreme
205-631-8225 6774 Old Hwy 31N
Rpmextreme.com Gardendale, AL 35071

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[mcarmel]

Thank you for the detailed information. I am still waiting for a diagnosis from the shop.

 

[SavannahAL]

I am gathering information to support a possible claim against Chrysler to reimburse me for repair costs. Could you email me any supporting information about your issue, and the others you met at the dealership? [email protected]

Unfortunately I don't have a thing. At the time I had a notebook going with all the service sheets inside. When I bought the diesel and traded in I tossed the notebook out with glee and moved on.
You should try and get all current owners with problems to coordinate with you.

 

[mcarmel]

Here is a .pdf with a complete inventory of every single mod made to my Jeep SEA WITCH.

 

[Remorseless]

Here is a .pdf with a complete inventory of every single mod made to my Jeep SEA WITCH.

Holy shit, $50 for mosquito zapper? That sumbitch expensive!

 

[mcarmel]

The auto manufacturers are mandated to improve gas mileage so they move to aluminum blocks to save weight. But all you need is a $2 temperature sensor to fail and you blow your engine. Now how much is carbon footprint by replacing an engine with only 62K miles on it? The government is run by incompetents.

 

[wibornz]

The auto manufacturers are mandated to improve gas mileage so they move to aluminum blocks to save weight. But all you need is a $2 temperature sensor to fail and you blow your engine. Now how much is carbon footprint by replacing an engine with only 62K miles on it? The government is run by incompetents.

Did you just figure this out. Voting has repercussions.

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