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Old 11-27-2012, 04:35 PM   #121
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Ok, so I just got off the phone with the service shop foreman who spoke directly to the Jeep engineer in Detroit. As suspected, there was not much more info to share with me, unfortunately. What he did say was that it was a "known issue" and they were working on a solution. The issue appears to be that there is "an air pocket at the top of the heater core" that cannot be removed by traditional means...ie bleeding the system (with the front of the vehicle elevated). Jeep does not believe there is a serious mechanical issue or that the heater core is failing (but, they can't be 100% sure at this point), but rather that they/we are dealing with a nuisance issue. I believe this reaffirms the thought I expressed on a previous post, which I guess is good (???), but still frustrating. Consequently, my dealership told me when I brought the vehicle in that they had never seen this issue before; apparently, someone else contacted them today with the same issue and told that customer to hold tight until a solution is found...which they believe will be relatively soon based on past experience. I'm not a big fan of dealership service, but I am pleased in this case that they did not tear my JK apart trying to find something they were not going to be able to fix.
heck I should move to detroit and be a jeep engineer. It took me 10 minutes to burp mine and no more running water sound and all 4 vents blow = hot air. I fixed mine right after I bought it and have about 3500 miles now and it has never returned.

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Old 11-27-2012, 04:49 PM   #122
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heck I should move to detroit and be a jeep engineer. It took me 10 minutes to burp mine and no more running water sound and all 4 vents blow = hot air. I fixed mine right after I bought it and have about 3500 miles now and it has never returned.
Can you tell us how you "burped" your JK? I am interested....

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Old 11-27-2012, 05:06 PM   #123
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already asked and answered lol. towards the beginning of this thread.
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Old 11-27-2012, 05:57 PM   #124
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Glad to hear a successful (burping) story. Service did mine three times unsuccessfully. I don't think you would make a good Jeep engineer because you actually had a working solution. Ha. Consequently, I have not had any heat issues. All four vents blow burning hot air.
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Old 11-27-2012, 06:48 PM   #125
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already asked and answered lol. towards the beginning of this thread.
I see - thank you very much!
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Old 12-02-2012, 10:09 AM   #126
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Unhook the overflow hose from the radiator neck and slide the overflow reservoir up until the tabs clear the slots and remove it. Dump out enough coolant so the level is at the mark.

Reinstall overflow reservoir and connect hose. Add coolant to radiator until it reaches the bottom of the filler neck. Squeeze the upper radiator hose to work the air out, you will see bubbles. Add more coolant as necessary. Continue squeezing the upper hose until you can't get any more air out. Top off radiator and install cap.

BTW: With the engine cold and off, there is no pressure in the system. Even if the system is full it is still fairly easy to squeeze the upper hose.
Thanks again. I did this three times i.e. removing the bottle and dumping some fluid into the radiator. Now I have the fluid in the over flow bottle back down below the max line and the noise seems to have gone away. I'll update if the sloshing sound returns. Oh, make sure you get the bottle attached at the bottom as well as the top when you put things back together. Also, I did not detach the hose when I did the procedure -just left it hooked up.
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Old 12-02-2012, 03:10 PM   #127
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Old 12-02-2012, 08:37 PM   #128
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Been in once for service, no change. Bled the system, etc, still doing it. Service said they will re-do, but no risk to the system. Heater is working fine.
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Old 12-02-2012, 09:34 PM   #129
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Why not burp it yourself?
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Old 12-02-2012, 11:51 PM   #130
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Been in once for service, no change. Bled the system, etc, still doing it. Service said they will re-do, but no risk to the system. Heater is working fine.
Mine started doing it again within 2 months of it being burped. My heat isn't effected by the noise.

My Jeep puts out searing heat on all vents. I have to point the driver's side vent to blow away from the steering wheel or my hand feels like its being grilled while I'm driving.

Honestly, if I listen close, I can hear the same noise in my Focus and Corolla.

I think all cars do it to some extent and the Wrangler just sounds louder than other cars because there isn't much between you and the heater core when compared to other cars.

I'm going to just live with it since the heat works.
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Old 12-03-2012, 03:00 AM   #131
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Originally Posted by MUEngineer

Mine started doing it again within 2 months of it being burped. My heat isn't effected by the noise.

My Jeep puts out searing heat on all vents. I have to point the driver's side vent to blow away from the steering wheel or my hand feels like its being grilled while I'm driving.

Honestly, if I listen close, I can hear the same noise in my Focus and Corolla.

I think all cars do it to some extent and the Wrangler just sounds louder than other cars because there isn't much between you and the heater core when compared to other cars.

I'm going to just live with it since the heat works.
Same here no issue with heat an half the time the slosh doesn't happen or I don't hear it. It doesn't bother me an as long as it isn't messing up anything an a real problem there is no issue to me
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Old 12-03-2012, 09:13 PM   #132
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Same here

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Originally Posted by MUEngineer View Post
Mine started doing it again within 2 months of it being burped. My heat isn't effected by the noise.

My Jeep puts out searing heat on all vents. I have to point the driver's side vent to blow away from the steering wheel or my hand feels like its being grilled while I'm driving.

Honestly, if I listen close, I can hear the same noise in my Focus and Corolla.

I think all cars do it to some extent and the Wrangler just sounds louder than other cars because there isn't much between you and the heater core when compared to other cars.

I'm going to just live with it since the heat works.
Same here. We're in the same boat. No good can come from me getting under the hood of a brand new car and trying to do something the dealer has already done 3 times. I know my liimits.
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Old 12-03-2012, 09:16 PM   #133
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Mine started doing it again within 2 months of it being burped. My heat isn't effected by the noise.

My Jeep puts out searing heat on all vents. I have to point the driver's side vent to blow away from the steering wheel or my hand feels like its being grilled while I'm driving.

Honestly, if I listen close, I can hear the same noise in my Focus and Corolla.

I think all cars do it to some extent and the Wrangler just sounds louder than other cars because there isn't much between you and the heater core when compared to other cars.

I'm going to just live with it since the heat works.
Mine started after I had the drivers side cylinder head replaced... they drained the coolant and refilled and I have had the problem ever since.
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Old 12-03-2012, 09:32 PM   #134
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Mine makes an odd watery noise. Heck, I figured it was just "A Jeep thing"...

But my driver side heat can burn the skin off my hand....so I won't worry about it.
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Old 12-03-2012, 11:32 PM   #135
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Same here. We're in the same boat. No good can come from me getting under the hood of a brand new car and trying to do something the dealer has already done 3 times. I know my liimits.
Never assume the folks at the dealer are smarter than you. Techs can be extreme newbs that have no business changing the spark plug in a lawn mower to extremely experienced knowledgeable mechanics.

Burping the system isn't that difficult to do yourself.
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Old 12-05-2012, 06:29 AM   #136
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Never assume the folks at the dealer are smarter than you. Techs can be extreme newbs that have no business changing the spark plug in a lawn mower to extremely experienced knowledgeable mechanics.

Burping the system isn't that difficult to do yourself.
I need some help burping he system... I tried once but It did not work.
What is the process?
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Old 12-11-2012, 10:03 AM   #137
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So, I had my heater core replaced due to no heat on the drivers side.
and now I hear the water flushing sound behind the dash ( sound like it's behind the glove box) when I turn my car on, and while my car is warming up.
After I drive down the street and the car is warm the sound goes away.

Is this a cause for BURP?

I watched a you tube Video on how to do it

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Old 12-11-2012, 01:30 PM   #138
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I need some help burping he system... I tried once but It did not work.
What is the process?
Add coolant to radiator until it reaches the bottom of the filler neck. Squeeze the upper radiator hose to work the air out, you will see bubbles. Add more coolant as necessary. Continue squeezing the upper hose until you can't get any more air out. Start the engine and continue the process. Top off radiator and install cap. It may help to park on an incline with the nose up since air likes to rise, it may help it work out faster.

BTW: With the engine cold and off, there is no pressure in the system. Even if the system is full it is still fairly easy to squeeze the upper hose.

Quote:
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So, I had my heater core replaced due to no heat on the drivers side.
and now I hear the water flushing sound behind the dash ( sound like it's behind the glove box) when I turn my car on, and while my car is warming up.
After I drive down the street and the car is warm the sound goes away.

Is this a cause for BURP?

I watched a you tube Video on how to do it

I say a burp certainly wouldn't hurt.
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Old 12-13-2012, 06:38 AM   #139
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I was having this issue of hearing the rushing water behind the dash. My jeep was due for it's first oil change so I took it over to the local oil change guy who will use any brand oil and filter you request. I noticed afterwards the receipt said they topped off the radiator reservoir tank, and since then I haven't heard that rushing water sound. Don't know if they burped it but the sound is gone. Nice.
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Old 12-13-2012, 08:13 AM   #140
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I had the same issue at the very start of cold temps here in CT. I had heard the water sound on start (a flushing sound). I read on this board and a few others and bought a special funnel to burp the system. I got lazy and didn't do it. Well, I have not heard the sound in quite a long while and I've been putting my heat on every morning here.

So, for me, it just went away.
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Old 12-13-2012, 05:57 PM   #141
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Same here

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I had the same issue at the very start of cold temps here in CTm. I had heard the water sound on start (a flushing sound). I read on this board and a few others and bought a special funnel to burp the system. I got lazy and didn't do it. Well, I have not heard the sound in quite a long while and I've been putting my heat on every morning here.

So, for me, it just went away.
Same here. After all of the aggravation, mine is gone too. They burped it 3x at the dealership and it still made some noise immediately after...but, it went away after about a week or so. I've been pessimistically waiting for it to come back over the past few weeks before posting again, but it hasn't. Strange. Not complaining.
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Old 12-15-2012, 02:01 AM   #142
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I was having this issue of hearing the rushing water behind the dash. My jeep was due for it's first oil change so I took it over to the local oil change guy who will use any brand oil and filter you request. I noticed afterwards the receipt said they topped off the radiator reservoir tank, and since then I haven't heard that rushing water sound. Don't know if they burped it but the sound is gone. Nice.
The only thing here that would make me a bit nervous is not knowing what fluid they used to top it off - the new 2013 JK's (I notice you didn't state what year yours is) take OAT, while the 2012 takes HOAT, and the older ones take a different fluid too. I would have no issue with an older vehicle being topped up, but a had my dealer top mine off after I did the last burping because of two things - the type of fluid required, and if they top it off it's free under warranty. Free is good.

As a side note, mine's been doing good since the last burping I did.
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Old 02-26-2013, 09:15 PM   #143
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anyone heard from dealer? I tried burping the system but i guess i didn't do it right.

I opened the cap off and turned the engine on ( it wasn't cold all the way, it was about 1/4 from temp on dash) Well...coolant was coming up and over flew a little so i had turned it off. Anyway i didn't see any air or anything tho.
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Old 02-28-2013, 05:11 PM   #144
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Got my car back from dealer. They flush the coolant and told me it is fixed. But when i drove back few milies i still hear "water dripping" behind dash. Maybe i think it can be AC drain tube. Do anyone where is AC drain tube in JK?
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Old 02-28-2013, 07:07 PM   #145
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I don't want to get flamed too badly, but I wouldn't worry too much about the rushing water noise.

Now, for the explanation. The rushing water noise is coming from the heater box, which should be pretty obvious. The problem comes in when you try and fill the system from the radiator cap in the front of the engine bay. The fill port for any coolant system is at the highest point, which is usually the radiator, but sometimes it's on the expansion tank. And here where my Jeep noobness comes in, because I just bought my new JKU two weeks ago, so I haven't even looked under the hood to see wether there is a radiator cap or not, but I assume so. Anyhow, even if you drain all the coolant out and refill it, almost always the hoses from the engine go down a little bit to enter the cabin, then go up again in the heater box. This almost always creates an air pocket inside of the heater box when you fill the system back up. Every time I have to fill a coolant system, I use my vacuum filling system, which creates 25-30 psi of vacuum, and then fills the vacuum from a coolant tub to get a complete fill on the system, with no air pockets or burping required. However, about 50% of the time, when I take a test drive of the vehicle, I get the sound coming from the dash, it's just something that can't be avoided.

But there are some things check just to make sure your system is working properly. The two most important things are the temperature gauge and heater box function. As long as the temp needle works its way straight up and stops, and you have heat coming from the heater, then the system is working and you have coolant circulating through all necessary parts. But, as you drive, every little bump you hit should dislodge some air and send it through the system, where it will eventually collect in the expansion tank. So just keep your expansion tank at the max line, and the sound will go away naturally as air gets worked out and coolant gets sucked into the system from the expansion tank during the cool-down period.

But, if at any point your engine starts to overheat or you lose heater box functionality, you need to address the problem ASAP. But the good news is that if there weren't any air pockets big enough to create an airlock the first time the engine was started, then you shouldn't develop one later.
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Old 03-25-2013, 10:22 AM   #146
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Jeep is roughly 5weeks old and the "water/river" sound is getting louder at a cold start and with acceleration. I'll trying burping my Jeep when I get home tonight and see if that fixes the sound. I'll check coolant levels before and after too. My driveway is on a slight incline, so I'm guessing this should help slightly to help air travel to the cap.

There have been some great and helpful posts on this thread, thank you to all who've contributed.
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Old 03-25-2013, 10:48 AM   #147
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I have a few other things that need to be worked out by the dealer (whistling noise in the rear of the hardtop when the vent is on full blast...sounds like a bad seal, Heated seats not working below 20 degrees, stripped door bolt)....so I'll have them look at this as well...just so it is on my service record.
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Old 05-09-2013, 08:13 PM   #148
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I started to hear the sound a couple of days ago, getting loud too. Feels like my Jeep had a nature call. Is the water sound a serious issue? should I take my Jeep first thing in the morning to the dealer??? or can it wait?? or just leave it and it will go???

I think our wranglers are alive! they are just asking for mud, dirt and rocks... and more affection!
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Old 05-09-2013, 08:43 PM   #149
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^Burp it yourself.
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Old 05-09-2013, 08:51 PM   #150
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wow so glad i saw this thread! my JKUR '13 does this!

when i start it up i feel like i here a small waterfall behind the dash on the passenger side. everything runs fine but is it something i should take it in for?

*edit*
after reading it doesn't seem serious. again, everything works fine. maybe i will mention it on the first oil change but this doesn't seem like a big deal.

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