5.7L needs coolant constant, but no leak. - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > 2005+ Jeep Commander XK

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 10-09-2016, 05:21 PM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
5.7L needs coolant constant, but no leak.

I have a 2006 Commander Limited with the 5.7L. We constantly have to add coolant, but I don't see or smell anything bad. The bottom is as dry as a bone and I don't see any obvious leaks.

What I did found:
  • I have to constantly add some coolant in the radiator as it seems to drop about 1.5"
  • The temp gauge seems to go up to almost max when it sits still in idle at a drivethru or stoplight
  • The fan comes on but the clutch makes a whining noise, like a bearing
  • The past owner said it had a water pump replaced within the last two years (it seems pretty new
  • I don't see any obvious white smoke due to a head gasket failure, and performance of the truck seems to be normal
I have no idea where the coolant goes other than in the engine. I heard and read about air in the coolant system. Would that loose any coolant?

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 10-09-2016, 05:26 PM
bill_de's Avatar
Premium Member
My Jeep: 2017 5.7L WK2
 
Join Date: Sep 2012
Posts: 8,597
Thanks: 732
Thanked 1,064 Times in 825 Posts
Rep Power: 1805963
bill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

Have you looked at your oil and tyranny fluid ... if automatic?

--
__________________
If you need a shoulder to cry on ...
... pull over to the side of the road!

Reply With Quote
  #3  
Old 10-09-2016, 05:28 PM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
Re: 5.7L needs coolant constant, but no leak.

I looked at the oil lit to see if there was any evidence of coolant, but did not see any. I have not looked at the transmission fluid. What is that?
Reply With Quote
  #4  
Old 10-09-2016, 05:49 PM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
Re: 5.7L needs coolant constant, but no leak.

One thing I do like to add is that I added green 50/50 coolant in it, and it all seems to be gone while there is still orange coolant left in the reservoir. Does the 5.7L need specific coolant? Could that be it?
Reply With Quote
  #5  
Old 10-10-2016, 02:56 PM
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: May 2013
Location: Colorado
Posts: 4,091
Thanks: 74
Thanked 292 Times in 256 Posts
Rep Power: 46483
lstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

Quote:
Originally Posted by alwaysdutch View Post
One thing I do like to add is that I added green 50/50 coolant in it, and it all seems to be gone while there is still orange coolant left in the reservoir. Does the 5.7L need specific coolant? Could that be it?
Yes, it does.
Never mix coolant types.
Flush it and fill only with spec'd coolant.

Back to your original problem, roughly how much coolant do you lose?
Is it about the same for a given week, or does it vary with miles driven?

Suspects would be slow leaks where the coolant is getting on something hot that evaporates it such that you don't see a visible leak.

The coolant recovery bottle has been known to get small cracks, where it will leak.

Or, the fluid may be gathering where it isn't visible, say at the !@#$!@#$ plastic tanks on the radiator or the !!#@$&#$%^ plastic fitments for hoses.

Suggest picking up a bottle or two of dye and the matching UV light. Wash the engine, radiator, underside completely, then add the dye and drive a bit. Check in a darkened garage or with a blanket over the hood to make it a bit easier to see even small amounts of dye.

If all else fails, pressure test it--with dye.

If still nothing, compression test all cylinders for a gasket leak.
Reply With Quote
  #6  
Old 10-10-2016, 03:33 PM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
Re: 5.7L needs coolant constant, but no leak.

I can take it for a 30-60 minute ride and loose the delta of full vs add on the reservoir. Now, I looked yesterday and interesting enough, the green 50/50 coolant disappeared but the orange coolant was still in the reservoir, as it looks like the green coolant dried up on hot temps.

I am going to try to do a coolant flush this evening and see if it makes a difference. Funny how they say "mix with any color coolant" on the bottle....
Reply With Quote
  #7  
Old 10-10-2016, 10:02 PM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
Re: 5.7L needs coolant constant, but no leak.

Well, this is almost funny. The commander has some starting issues. After a few seconds having it on ignition, it has a hard time starting and after three times all you hear is a bunch of clicking, but no start. While looking at the starter, I noticed two lines that run to the bottom behind the front passenger tire, and surely enough there I see some coolant hanging. One of those two lines must have any issue, so i will go check that out AFTER I figure out whay the thing has to be jumped every day.
Reply With Quote
  #8  
Old 10-10-2016, 10:11 PM
xJoshxx's Avatar
Premium Member
My Jeep: 2012 6.4L WK2
 
Join Date: Mar 2011
Location: Burlington,KY
Posts: 1,594
Thanks: 149
Thanked 214 Times in 165 Posts
Rep Power: 74377
xJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

Quote:
Originally Posted by bill_de View Post
Have you looked at your oil and tyranny fluid ... if automatic?

--
Highly doubt on these.

Transcooler is in the Condenser

Oil cooling is a Plate. it goes Block/sealed Plate with 2 nipples out/Oil filter.

Radiator is just a radiator on these.
__________________
2012 Grand Cherokee SRT8
Reply With Quote
  #9  
Old 10-11-2016, 07:12 AM
billt's Avatar
Senior Member
My Jeep: 2015 5.7L WK2
 
Join Date: Mar 2015
Location: Glendale, Arizona
Posts: 1,433
Thanks: 361
Thanked 315 Times in 211 Posts
Rep Power: 18176
billt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond reputebillt has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

First things first. Buy a new radiator cap. They go bad often enough, and when they do they allow coolant loss without observing any leaks. A bad cap that won't hold proper pressure will also allow for high temperature running. Especially at idle with minimum air and coolant circulation with the engine running. It's the easiest and cheapest place to start.
Reply With Quote
  #10  
Old 10-11-2016, 08:33 AM
Member
 
Join Date: Oct 2016
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 207
alwaysdutch is on a distinguished road
Re: 5.7L needs coolant constant, but no leak.

I guess a radiator cap is always a thing to buy, but I like to figure out what these two lines are for that run behind the passenger front wheel. There I see a drop of coolant hanging, which might be the answer.
Reply With Quote
  #11  
Old 10-11-2016, 02:25 PM
WK2OverlandII's Avatar
Quadra-Drive II
My Jeep: 2014 3.0L WK2
 
Join Date: Nov 2010
Location: PA WILDS
Posts: 644
Thanks: 345
Thanked 79 Times in 69 Posts
Rep Power: 18651
WK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond reputeWK2OverlandII has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

Like billt said, start with a radiator cap, then change the thermostat. I most definitely would also change the coolant if it has been mixed with the wrong coolant else.
__________________
2014 JGC Limited - Granite/Black - 3.0L ECODiesel - LUX II - NAV - Off Road II- Block Heater.
__________________________________________________ ____________________________

On order: 2017 RAM 1500 Crew 4x4 Sport (Night Edition) Granite/Black - 5.7L Hemi, Rambox, Sport hood and to many more options to list.
Reply With Quote
  #12  
Old 10-11-2016, 03:24 PM
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: May 2013
Location: Colorado
Posts: 4,091
Thanks: 74
Thanked 292 Times in 256 Posts
Rep Power: 46483
lstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond repute
Re: 5.7L needs coolant constant, but no leak.

Quote:
Originally Posted by alwaysdutch View Post
I can take it for a 30-60 minute ride and loose the delta of full vs add on the reservoir. Now, I looked yesterday and interesting enough, the green 50/50 coolant disappeared but the orange coolant was still in the reservoir, as it looks like the green coolant dried up on hot temps.

I am going to try to do a coolant flush this evening and see if it makes a difference. Funny how they say "mix with any color coolant" on the bottle....
That bottle may say that, but your system should be using HOAT type coolant.
If you have the owner's manual, check it.
If not, you can probably get an answer at Jeep SUVs & Crossovers | Official Jeep Site | Jeep, or from a local mechanic with a FSM for that thing.


HOAT [orange] coolants carry this warning:

CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any other type of antifreeze. Doing so will reduce the corrosion protection and may result in premature water pump seal failure. If non-HOAT coolant is introduced into the cooling system in an emergency, it should be replaced with the specified coolant as soon as possible.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
94 JGC Limited making constant ticking sound vulkus Grand Cherokee - ZJ 1 12-27-2012 04:14 PM
Constant Sirius updating cherokeesrt10 Audio/Visual/Navigation 11 03-22-2012 09:53 AM
Strange-MIL is constant and now ETC light comes on with message "Check Gauges" oldgeezer Troubleshooting/Problems 4 01-18-2012 06:10 PM
Constant "Fan Sound" in RHR Hollywood Audio/Visual/Navigation 5 07-31-2011 06:46 PM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:13 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.