2017 3.6l coolant concerns - JeepForum.com
 
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post #1 of 9 Old 08-21-2019, 09:48 PM Thread Starter
detroitrust
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2017 3.6l coolant concerns

I've been up to my eyeballs with my WJ hanging out over there getting schooled by community brilliance.

Now it's my 17 JGC with 20k miles. I always detect a faint smell of coolant after it runs and I park it. Can't find any leaks but the level is approaching the minimum level on the overflow tank. Also, there is sludge or slime around the neck and bottom of the the radiator cap. I change the oil every 5k miles and other than is being thin as piss, haven't noticed any issues.

I don't know if this is relative, but I have taken the car to the dealer because the AC cool temperature is questionable. I told the guy it's not nearly as efficient as my 18 Fusion. Tech said Ford has the best AC and Mopar can't come close so don't compare the two. WTF?

So, anybody got some idea here? I will check which color coolant is in there, it's original from the factory. I found info on the water pumps for the V8 but nothing on the 6. I know I better start sorting this out now before my warranty expires.

Thanks for any suggestions.

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post #2 of 9 Old 08-21-2019, 09:57 PM
ColdCase
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Small coolant leaks can evaporate before you can tell where they are coming from. Our Cheby smelled of coolant for years, turned out to be a failing head gasket, a feature GM engineered into that engine..

Sludge could mean air being sucked in (typical of water pump seals) or combustion products in the coolant... or someone added incompatible antifreeze when toping off.

A few years ago there was some discussion of sludge in the radiator/cap. Don't recall the conclusion off hand, perhaps someone will jump in here soon.

Some people think I'm stupid and I totally disagree. But my biggest fear is that me thinking I'm smart proves them right.....
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #3 of 9 Old 08-22-2019, 06:14 AM Thread Starter
detroitrust
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That's my concern; I shouldn't be smelling coolant on a 20k miles JGC. Combine that with sludge around the caps and minimum reading on the overflow tank.
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post #4 of 9 Old 08-22-2019, 09:24 AM
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Quote:
Originally Posted by detroitrust View Post
I've been up to my eyeballs with my WJ hanging out over there getting schooled by community brilliance.

Now it's my 17 JGC with 20k miles. I always detect a faint smell of coolant after it runs and I park it. Can't find any leaks but the level is approaching the minimum level on the overflow tank. Also, there is sludge or slime around the neck and bottom of the the radiator cap. I change the oil every 5k miles and other than is being thin as piss, haven't noticed any issues.

I don't know if this is relative, but I have taken the car to the dealer because the AC cool temperature is questionable. I told the guy it's not nearly as efficient as my 18 Fusion. Tech said Ford has the best AC and Mopar can't come close so don't compare the two. WTF?

So, anybody got some idea here? I will check which color coolant is in there, it's original from the factory. I found info on the water pumps for the V8 but nothing on the 6. I know I better start sorting this out now before my warranty expires.

Thanks for any suggestions.
Have you had your oil tested to see if there is coolant in the oil? I test my oil after each oil change. I have noticed the coolant reservoir level diminish over time. I have told the dealership many times about this, they claim to do pressure tests and see no leaks. Yet, for the last 70,000 miles over 18 months, every oil change/test result show high potassium & sodium.

When I do the oil change, there is no coolant in the oil to the naked eye, but the test results show it.
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14 GC Overland 3.6L 230,000 miles
05 GC Laredo 3.7L 412,646 miles

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post #5 of 9 Old 08-22-2019, 09:55 AM
Jurassic_Jeep
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my jeep did the same, there was a coolant smell every time i would park and walk away from the front of the vehicle since day 1. Dealer couldn't find a leak (nor could I), but they replaced all the hoses and replaced the coolant. Smell was still there. After about 3.5 years, it finally showed up on the radiator housing (there was issue with a crimp), and they replaced my radiator and that solved the problem. Small leak, but indeed the reservoir would drop from Max to Min over the course of 1.5 years. Never checked my oil though for sodium/potassium

2014 Jeep Grand Cherokee Summit 4x4 3.6L V6.
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post #6 of 9 Old 08-22-2019, 10:01 AM
ecupip
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Sounds to me like an EGR cooler leak. They can leak slightly around fittings and leave very little trace that it is happening other than a slow leak. The extreme heat of that unit vaporizes the coolant immediately.

Current: 2011 GC Limited Dark Charcoal, Lux II, Off Road, HEMI.
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post #7 of 9 Old 08-23-2019, 12:55 AM
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Quote:
Originally Posted by DavidsCyclops View Post
Have you had your oil tested to see if there is coolant in the oil? I test my oil after each oil change. I have noticed the coolant reservoir level diminish over time. I have told the dealership many times about this, they claim to do pressure tests and see no leaks. Yet, for the last 70,000 miles over 18 months, every oil change/test result show high potassium & sodium.

When I do the oil change, there is no coolant in the oil to the naked eye, but the test results show it.
Looking at the mileage on your vehicles I have to admire your method..and realize many truckers test routinely, so tell us what testing facility do you use and the cost per test. Looks like you get a lot of data....with the exception of HDL/LDL and total cholesterol.
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post #8 of 9 Old 08-23-2019, 08:11 AM
Davy_Baby9
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If you can smell it and not see it, the leak is small and evaporating before it can leak to the ground. My 2015 3.6 was doing this. Dealer said it replaced the radiator when I purchased it, but I'd smell coolant when I parked, and the bottle would lose an inch a week. One day I said screw it, I replaced the radiator cap and it fixed it. Been good for 50k miles so far.
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post #9 of 9 Old 08-23-2019, 11:08 AM
DavidsCyclops
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Quote:
Originally Posted by 0f02r View Post
Looking at the mileage on your vehicles I have to admire your method..and realize many truckers test routinely, so tell us what testing facility do you use and the cost per test. Looks like you get a lot of data....with the exception of HDL/LDL and total cholesterol.
Blackstone Labs $28 per test

14 GC Overland 3.6L 230,000 miles
05 GC Laredo 3.7L 412,646 miles

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