Cooling problems with 3.6

[Joaquim]

When was the last time you washed all of the mud off of the radiator?

No more then a few days after I go mudding... That is just from yesterday

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[mwilk012]

Replace the radiator.

 

[No IFS]

It worked great for years then the dealer touched it now it doesn’t work. Back to the dealer and have them fix it. If you were going to do the job yourself you should’ve done it before you went to the dealer not after.

 

[TOTL Innovations]

Im also trying to find a grille & hood that allows more airflow - please send any recommendations

An OEM vehicle shouldnt have the issues you are having in the conditions you are describing so I think something more serious is going on which upgraded parts may help with but will only be masking the underlying issue in the long run.

That said if you are still looking for upgrades, have you seen our H.E.R.O Hood?

 

[Joaquim]

Replace the radiator.

I think I’ll just flush the coolant a few times with distilled water then replace it properly and see what happens

 

[Joaquim]

It worked great for years then the dealer touched it now it doesn’t work. Back to the dealer and have them fix it. If you were going to do the job yourself you should’ve done it before you went to the dealer not after.

Unfortunately I’m 1500 miles from the dealer that did it - otherwise I would - nice name btw

 

[mwilk012]

I think I’ll just flush the coolant a few times with distilled water then replace it properly and see what happens

Flushing won’t get the packed mud out of the fins. That fine dust settles in there and sets up like concrete. The radiator is cheap and easy to replace.

 

[Petey]

Just curious if the Jeeps going to the desert countries Saudi Arabia etc have larger radiators??

No I haven’t been adding anything - and Yes the cooling issue has been persistent for a year, the timing faults 4 weeks, both unresolved - dealer is awful here and is still waiting on new ECU (it’s one of the first production 2018 JLUs so it’s around 4 years old and I use it consistently for off-roading in -20 to +125 degree weather) - the past few weeks it is has been nothing but trouble but somehow has not died on me, debating whether to sell/replace or completely overhaul in a few months

overheating coolant happens in 3 main situations: 1. Driving in the Mojave uphill for a while in extremely high temperatures attempting to maintain 50mph+ 2. Driving up I70 (7-10k ft altitude) and trying to climb at 50+ mph 3. Driving on a flat highway at high temps and high incoming winds

From what u wrote here I would say u need a radiator with more cooling capacity.

 

[LooselyHeldPlans]

I'm in Denver, so a little warmer than you. I have 315s and the 4.10 axles. I run the stock plastic bumper and have it hollowed up to fit a winch.

the only time I've ever ran too hot was when I was having ESS trouble and revving the engine while sitting still to try and push some juice into the battery. Never while moving.

I think you've got a mechanical issue.

 

[Joaquim]

Flushing won’t get the packed mud out of the fins. That fine dust settles in there and sets up like concrete. The radiator is cheap and easy to replace.

What if I use a pressure washer on it?

 

[mwilk012]

What if I use a pressure washer on it?

You can’t get past the condenser on the front side without removing the radiator. You can buy a radiator for less than $200.

The symptoms you are describing are one of two things, either reducing cooling system heat transfer capacity, or a blown head gasket. I’d like it to not be the second thing.

 

[Joaquim]

You can’t get past the condenser on the front side without removing the radiator. You can buy a radiator for less than $200.

The symptoms you are describing are one of two things, either reducing cooling system heat transfer capacity, or a blown head gasket. I’d like it to not be the second thing.

Alright, thanks for the help - would you happen to the know the part # for the radiator? and would you recommend upgrading to a different one?

 

[Petey]

What if I use a pressure washer on it?

thats not cool

 

[mwilk012]

thats not cool

Just gotta be careful with it, or you’ll end up with every fin of the radiator being flattened and air flow completely shut off.

 

[mwilk012]

Alright, thanks for the help - would you happen to the know the part # for the radiator? and would you recommend upgrading to a different one?

I’m 99% sure it’s 68314786AC

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