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Old 07-31-2019, 12:25 AM
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Radiator boiling/engine not overheating

I have a '12 Wrangler JK with 88k miles. Had the radiator flushed 15-20k miles ago, which started this problem again. Coolant empties in 3-7 days, but temp gauge reads normal. Happening whether I run the a/c or not, but happening more this summer. Ideas? Tired of coolant on driver's side of jeep.

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Old 07-31-2019, 10:31 AM   #2
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Blockage, too much air in system, radiator cap not correct PSI or failing or the dreaded head gasket. Autozone sells a combustion leak test kit that will tell you real quick if exhaust is getting into the system.
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Old 07-31-2019, 10:46 AM   #3
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Try burping the radiator to remove possible trapped air in the system. Park on a slope, hood uphill. With the motor running, slowly open the radiator cap just enough to let the air out. Use a towel, don't burn yourself. After you do that a few times top it off with fresh fluid.
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Old 07-31-2019, 11:42 AM   #4
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Old 07-31-2019, 11:46 AM   #5
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your radiator is most leaking. Common problem. look at the bottom of the radiator on driver's side I bet you have pink residue which is a tell tale sign.
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Old 07-31-2019, 07:48 PM
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I replaced the radiator cap a week ago with no results. I have tried running the engine hard on the highway to clean it out, which has worked some in the past, with no results.I do not have any hisses or leaks that would show a hole somewhere, nor any fan noises or issues . If these were acting up, I would think the temperature gauge would show overheating. The gauge stays normal.
I will look at the bubble issue in the radiator.
I appreciate the feedback. Other thoughts?
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Old 07-31-2019, 08:02 PM
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I've already been a recipient of a lot of engine work courtesy of Chrysler and the bad engine issue(new cams/rocker arms/valve springs.) The problem existed before and after the engine work, and the rebuilding did not seem to affect the coolant issue.
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Old 08-01-2019, 09:07 PM
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There was a tiny leak under the top edge of the radiator driver's side. New radiator
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Old 08-02-2019, 11:14 AM   #9
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There was a tiny leak under the top edge of the radiator driver's side. New radiator
Glad to hear it wasn't a head gasket.
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Old 08-03-2019, 10:15 AM
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I just found out this morning it has a very good chance of being the head/head gasket. Hydrocarbons are leaking into my coolant causing my engine to overheat...after a new radiator and flush. Bummer again. Should be covered by Chrysler again(see previous post).
Will keep you posted!
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Old 08-03-2019, 10:16 AM
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The only thing not replaced by Chrysler on the engine work was the head/head gasket.
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Old 08-08-2019, 08:50 PM   #12
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New to the Wrangler community, but saw this thread and it seemed like our problem. Purchased a 2016 JKU last month. Husband said he smelled coolant. I read you post and looked under the car today - sure enough there's the pink (see photo). Just came for verification that this is a radiator leak. (Husband is out of town until tomorrow) No smoke, no obvious signs of leaking on the ground, no running hot. I planned on calling the dealer tomorrow since we have a 6 month pre-owned warranty.
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Old 08-08-2019, 10:25 PM
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My jeep is back from repair. Once the radiator was replaced, and flushed by my regular mechanic, the engine ran hot for a few days. I took it into my dealership(which I trust completely), and there is an issue with the flushing the system well, using the correct coolant-which is specific-, and then making sure all air pockets are out of the water flow in the system.
I am 2 days out of the shop with no problem so far. The service dept. head has a 2012 JK and is familiar with many of the problems the 3.6 has had.
Keep that in mind as you get your jeep back from repair!
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Old 08-08-2019, 10:59 PM   #14
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Quote:
Originally Posted by Reevesra79 View Post
New to the Wrangler community, but saw this thread and it seemed like our problem. Purchased a 2016 JKU last month. Husband said he smelled coolant. I read you post and looked under the car today - sure enough there's the pink (see photo). Just came for verification that this is a radiator leak. (Husband is out of town until tomorrow) No smoke, no obvious signs of leaking on the ground, no running hot. I planned on calling the dealer tomorrow since we have a 6 month pre-owned warranty.
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Old 08-09-2019, 12:10 PM   #15
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Quote:
Originally Posted by jeeptennis View Post
My jeep is back from repair. Once the radiator was replaced, and flushed by my regular mechanic, the engine ran hot for a few days. I took it into my dealership(which I trust completely), and there is an issue with the flushing the system well, using the correct coolant-which is specific-, and then making sure all air pockets are out of the water flow in the system.
I am 2 days out of the shop with no problem so far. The service dept. head has a 2012 JK and is familiar with many of the problems the 3.6 has had.

Keep that in mind as you get your jeep back from repair!
Thanks! Those helpful hints will take us far. I gotta say, the Jeep community seems unbelievably helpful and welcoming. Glad to be a part of it!
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Old 08-09-2019, 12:24 PM   #16
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Quote:
Originally Posted by Reevesra79 View Post
New to the Wrangler community, but saw this thread and it seemed like our problem. Purchased a 2016 JKU last month. Husband said he smelled coolant. I read you post and looked under the car today - sure enough there's the pink (see photo). Just came for verification that this is a radiator leak. (Husband is out of town until tomorrow) No smoke, no obvious signs of leaking on the ground, no running hot. I planned on calling the dealer tomorrow since we have a 6 month pre-owned warranty.
Hi Reevesra79,
We're sorry to hear that you have experienced this. If you would like any additional assistance while working with your dealer, please send our team a private message and we would be happy to get you connected with a case specialist!
Alex
Jeep Social Care Specialist

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