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Old 09-30-2015, 09:05 AM
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Disappearing coolant? Please help

I have a 2011 GC Overland with a 5.7L hemi and noticed I've had to top off the reservoir a few times over the last couple of months.

Not like when I've had a leak in previous vehicles, where it takes some coolant or water ever other day or two... But often enough to where it doesn't seem normal either.

I first noticed the reservoir was low in April so I bought some red HOAT at O'Reileys and used up about 1/3 of the gallon jug to top off. Then late June had to add another 1/3rd jug, and just two days ago I finished the last 1/3rd of the gallon.

I've sat and watched it idle for 15-20 mins and saw no active leaks or drips.

I've been watching the temperature gauge and it usually stays around 205-212. But sometimes it creeps up to 226. Once I get rolling, especially on highway it can get down to 196.

About 6 weeks ago I noticed steam boiling out of the engine bay at only about 215 degrees. I know that's above the boiling point of water but coolant should be much higher, like 260+.
BUT, this was during a period of lots of rain here in Tampa and there was a lot of standing water around and it could have been splashed up water on the engine exhaust.

Just in case I replaced the radiator cap thinking it could be failing and allowing steam to release at too low of a temp. This would explain disappearing coolant.
But again that was 6 weeks ago and the coolant has disappeared again since doing this.

When it sits and idles from cold start the fan comes on around 200 degrees. Then at 215 the fan speeds up. But I've also noticed at 222 degrees m the fan speed will sometimes drop down to a lower speed...?

Either way I've yet to see it actually over heat and get over 226. But it just seems it's running a bit hot compared to previous vehicles I've owned. Could this be causing evaporation?

Again I do live in Tampa FL, and it's been in the mid to high 80's lately.

I called my dealership and they said 210-230 is normal for this vehicle especially with warmer ambient temperatures AND running the a/c AND sitting in traffic.

I thought maybe the high temp speed fan wasn't working. My last vehicle, a 2004 WJ with 4.0L i6 had an issue where the low temp fan worked but when it clicked to the high temp speed it would shut off. But when this happened the temp would get up to 250.

So I don't think this vehicle has that issue (again I've watched the fan working) and it doesn't get THAT hot.

What could be causing the coolant to disappear?
Is evaporation that fast?

If so I'd think a lot of wk2 hemi owners may be driving around with empty coolant reservoirs as most people aren't that observant.

Again, no visible leaks, new radiator cap, high but not dangerous operating temps... Any ideas?

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  #2  
Old 09-30-2015, 09:10 PM
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Re: Disappearing coolant? Please help

Quote:
Originally Posted by floon34 View Post
I have a 2011 GC Overland with a 5.7L hemi and noticed I've had to top off the reservoir a few times over the last couple of months.

Not like when I've had a leak in previous vehicles, where it takes some coolant or water ever other day or two... But often enough to where it doesn't seem normal either.

I first noticed the reservoir was low in April so I bought some red HOAT at O'Reileys and used up about 1/3 of the gallon jug to top off. Then late June had to add another 1/3rd jug, and just two days ago I finished the last 1/3rd of the gallon.

I've sat and watched it idle for 15-20 mins and saw no active leaks or drips.

I've been watching the temperature gauge and it usually stays around 205-212. But sometimes it creeps up to 226. Once I get rolling, especially on highway it can get down to 196.

About 6 weeks ago I noticed steam boiling out of the engine bay at only about 215 degrees. I know that's above the boiling point of water but coolant should be much higher, like 260+.
BUT, this was during a period of lots of rain here in Tampa and there was a lot of standing water around and it could have been splashed up water on the engine exhaust.

Just in case I replaced the radiator cap thinking it could be failing and allowing steam to release at too low of a temp. This would explain disappearing coolant.
But again that was 6 weeks ago and the coolant has disappeared again since doing this.

When it sits and idles from cold start the fan comes on around 200 degrees. Then at 215 the fan speeds up. But I've also noticed at 222 degrees m the fan speed will sometimes drop down to a lower speed...?

Either way I've yet to see it actually over heat and get over 226. But it just seems it's running a bit hot compared to previous vehicles I've owned. Could this be causing evaporation?

Again I do live in Tampa FL, and it's been in the mid to high 80's lately.

I called my dealership and they said 210-230 is normal for this vehicle especially with warmer ambient temperatures AND running the a/c AND sitting in traffic.

I thought maybe the high temp speed fan wasn't working. My last vehicle, a 2004 WJ with 4.0L i6 had an issue where the low temp fan worked but when it clicked to the high temp speed it would shut off. But when this happened the temp would get up to 250.

So I don't think this vehicle has that issue (again I've watched the fan working) and it doesn't get THAT hot.

What could be causing the coolant to disappear?
Is evaporation that fast?

If so I'd think a lot of wk2 hemi owners may be driving around with empty coolant reservoirs as most people aren't that observant.

Again, no visible leaks, new radiator cap, high but not dangerous operating temps... Any ideas?
My 2011 Overland did the same thing. It was the water pump. Mine was replaced under warranty.
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Old 09-30-2015, 11:25 PM
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Re: Disappearing coolant? Please help

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Originally Posted by philbslc View Post
My 2011 Overland did the same thing. It was the water pump. Mine was replaced under warranty.
I don't think you read my whole comment

If my pump were leaking I'd see a drip or pooling ...
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Old 10-01-2015, 01:16 AM
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Re: Disappearing coolant? Please help

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Originally Posted by floon34 View Post
I don't think you read my whole comment

If my pump were leaking I'd see a drip or pooling ...
I read the whole thread. I had the same problem. No visible leak The water was turned to steam and blew out through the overflow line. We found the real problem on a mountain drive that heated up the engine so we could hear and see the steam going into the overflow tank. Even under those conditions, there was no water leaking around the pump. Something failed inside the pump. Check the oil temp in the EVIC and compare it to the water temp in the EVIC. The problem was obvious when we looked.
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Old 10-01-2015, 12:31 PM
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Re: Disappearing coolant? Please help

Quote:
Originally Posted by philbslc View Post
I read the whole thread. I had the same problem. No visible leak The water was turned to steam and blew out through the overflow line. We found the real problem on a mountain drive that heated up the engine so we could hear and see the steam going into the overflow tank. Even under those conditions, there was no water leaking around the pump. Something failed inside the pump. Check the oil temp in the EVIC and compare it to the water temp in the EVIC. The problem was obvious when we looked.
I appreciate your effort to help. But honestly how does that even make sense from a mechanical standpoint?

The water pump is nothing but an implellar that is spun by the engines belt and it moves water / coolant ... If the pump fails it can either leak (not happening here), or it can sieze up entirely and not move any coolant (engine would over heat), or it could begin to wear out and only slowly move water (also causing over heat or at least higher operating temperatures)

My engine is running within the normal range suggesting the pump us at east moving some coolant.

So my question is how can a worn out or bad pump cause the coolant to disappear? What is the mechanical action happening to cause that reaction?

The pump doesn't consume coolant.

And in my understanding the only way coolant / anti freeze can be turned to steam is if the engine gets over 260 aka boiling point of anti freeze coolant.

Oil temp 199, coolant temp ranging 201-212
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Old 10-02-2015, 12:20 AM
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Re: Disappearing coolant? Please help

Quote:
Originally Posted by floon34 View Post
I appreciate your effort to help. But honestly how does that even make sense from a mechanical standpoint?

The water pump is nothing but an implellar that is spun by the engines belt and it moves water / coolant ... If the pump fails it can either leak (not happening here), or it can sieze up entirely and not move any coolant (engine would over heat), or it could begin to wear out and only slowly move water (also causing over heat or at least higher operating temperatures)

My engine is running within the normal range suggesting the pump us at east moving some coolant.

So my question is how can a worn out or bad pump cause the coolant to disappear? What is the mechanical action happening to cause that reaction?

The pump doesn't consume coolant.

And in my understanding the only way coolant / anti freeze can be turned to steam is if the engine gets over 260 aka boiling point of anti freeze coolant.

Oil temp 199, coolant temp ranging 201-212
I have been fghting mystery water loss for a few months. No obvious leaks.
Two weeks ago after adding water again I took a ride in the mountains. Heard gurgling.
My water temp was 212, oil temp was 301. Mountain road 6500 ft elevation steep climb. Dealer says water pump failed to circulate properly. Did not tell me how the pump failed. Replaced under warrantee. Last weekend same road everything ok with new pump.
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Old 10-02-2015, 08:58 AM
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Re: Disappearing coolant? Please help

Hi.
I read this topic searching for something else, so joined the forum to reply
I don't have this model jeep in question but do have alot of experience with Jeeps, I run an overland business using a 4.7 HO and 2.7crd WJ jeep so need to know when things arnt right.

the symtons you describing I would say as other would be the water pump, I have had this issue and it was the water pump,
If you take the radiator cap off (engine cold) start the engine and can see bubbles, then thats the head gasket, Ive had that too.
but on your vehicle alot newer than mine I would put money on it being the water pump, not necessarily leaking all the time, probably more after you switch the engine off as thats when it will get hottest.

hope that helps Gary
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Old 10-02-2015, 09:20 AM
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Re: Disappearing coolant? Please help

Check under the engine. You may notice a little dropping. If so, it could be from oil cooler above the engine. This what was happen to me last month.
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Old 10-02-2015, 10:20 AM
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Re: Disappearing coolant? Please help

Check the radiator cap! "Cold motor only"take the radiator cap off and check that the rubber gasket on the cap is sealing correctly. I too had the disappearing coolant new cap fixed that as well as the anti freeze smell I would get from time to time. Top tip: by looking at the caps gasket you should be able to see if it's out of center. Mine was offset just enough to release steam therefor my coolant loss.
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Old 10-13-2015, 09:34 PM
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Re: Disappearing coolant? Please help

I changed the cap one day as a guess when I came into the garage after an 8 hour Jeep nap that followed a 2 hour drive up the Cajon Pass in hot exterior temps and found about 3 qts of coolant on the garage floor. WTH?

The replacement cap seemed to fix the issue.

Now, I have coolant on the ground that has me thinking either water pump is weeping or the lower radiator hose has a small split or isn't sealing.

I need to clean everything with parts solvent, dry it and then watch for leaks while it idles for 15-20 minutes. Yay...
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Old 10-13-2015, 10:11 PM
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Re: Disappearing coolant? Please help

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Originally Posted by quikduk View Post
I changed the cap one day as a guess when I came into the garage after an 8 hour Jeep nap that followed a 2 hour drive up the Cajon Pass in hot exterior temps and found about 3 qts of coolant on the garage floor. WTH?

The replacement cap seemed to fix the issue.

Now, I have coolant on the ground that has me thinking either water pump is weeping or the lower radiator hose has a small split or isn't sealing.

I need to clean everything with parts solvent, dry it and then watch for leaks while it idles for 15-20 minutes. Yay...
What do you mean water pump weeping?

I've sat and watched it idle for 1/2hr and see no coolant dripping anywhere

I top it off and it takes about 2-3 weeks to empty the reservoir.

Already put a new cap, hasn't changed anything. No active leaks, no visible steam blowing out.
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Old 10-13-2015, 10:48 PM
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Disappearing coolant? Please help

Ok I had the same issue and took it to the dealer and they changed my water pump (under warranty). The tech said that I had a leak and that it was so small that you probably didn't even see any on your driveway. I said nope, but he asked if I've been filling the coolant reservoir I answered I have and that's why I was in the shop. Seems like these pumps have an issue. Anyway I have a 12' GC 5.7L, and I filled coolant as well and I was lost. No visual pooling or dripping. No visual spray of coolant under the hood or pooling in the nooks and crannies around the engine. It may also be a crack in the reservoir, small one but there. I know another place I've had an issue (on my 95' ZJ) was the tubing from the radiator to the engine. I never saw visual proof either, but apparently there was a small slice in the tubing. And only under driving (not idling) true driving and pressure and normal heat was there enough pressure that it leaked out of that "slice". But idling and just looking the "slice" was not visible. Well good luck and let us know the mystery, when it gets solved.


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