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Old 11-05-2012, 06:02 PM   #61
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Originally Posted by Dakovich View Post
Picked my JKUR up on Friday with 2 miles on the clock, and today while sitting idle pairing up my iPhone I heard the noise. Currently 76 miles on the clock. Also was doing some other weird noise, kept cycling and it was much more pronounced under the Jeep. Either way, hope it's an easy fix like some of the DIYers have done, but what if all you've done is masked the real problem of a partially restricted cooling system by just removing some air from the system? Will continue to monitor.
It is a very common thing to have to burb a cooling system

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Old 11-05-2012, 06:37 PM   #62
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On this I wonder if I have some heater issue on my 2012 3.6l

The heater seems to blow fine with the upper vents an I can feel some heat from the drivers side floor vent but when it is cold (and really it doesn't get cold (48deg) in CA) my feet and legs almost never get warmed. First time I have ever had to turn up any car heater to 2 or 3 to stay warm, even my CJ7 or my Jensen Healey convertibles worked better. Again the upper vents work great, almost too hot at times. I have not heard any gurgling noises but usually have the radio on. I will have to check. I do not have the ticking valvetrain noise that I thought accompanied this though. I also would be concerned about sand in the engine clogging up other parts of the cooling system if this is in fact the case.

I know that on my ZR2 S10 this was a problem with the heater system. The system is a low pressure system and if any air gets in the system it collects in the heater hoses that ran on top of the engine. I had to get one of those add water kits from Prestone to bleed the system from time to time as the plastic manifold slowly leaked some coolant into the intake. That was until the air reacted with the newer coolent and plugged up the heater core (turned to a jelly like substance) and totally stopped working... If I remember correctly some Hondas will overheat if you don't bleed it properly.

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Old 11-05-2012, 07:13 PM   #63
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Mine has done it since I bought it amonth ago, and heat blows perfectly fine and even.
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Old 11-06-2012, 11:06 AM   #64
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IMO it isn't common to have to burp a cooling sytem unless it has been opened (flushing coolant, replacing a hose, draining coolant for other repairs). All these new vehicles shouldn't need burping from the factory. Perhaps there is an assembly line issue.
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Old 11-18-2012, 09:39 PM   #65
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My brand new 2013 sport unlimited makes the burbling sound for 20 seconds at start up. Everything else works fine. What's the downside if I just ignore it?
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Old 11-18-2012, 09:43 PM   #66
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My brand new 2013 sport unlimited makes the burbling sound for 20 seconds at start up. Everything else works fine. What's the downside if I just ignore it?
I think this is normal, it could just be due to the fact that the heater core sits really high and gets air in it when coolant drains back down.
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Old 11-19-2012, 02:57 AM   #67
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We sure haven't come too far... I remember my friends '49 Plymouth made those noises.

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Old 11-19-2012, 05:58 AM   #68
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I think this is normal, it could just be due to the fact that the heater core sits really high and gets air in it when coolant drains back down.
Not normal. If a cooling system is properly bled and full of coolant there won't be any air. That and the heater core sets lower than the radiator.
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Old 11-19-2012, 06:02 AM   #69
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I think this is normal, it could just be due to the fact that the heater core sits really high and gets air in it when coolant drains back down.
Not normal. mine doesn't. It did after I had the water pump changed but stopped as soon as I burped the system. I think the problem may be that they are not tightening the bleeder valves enough on some of them during assembly. Being that the valve is plastic, it is hard to judge whether it is tight enough or not since you are not able to torque it. I had to tighten mine one full turn after the echanic at the dealer "tightened" it
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Old 11-19-2012, 06:02 AM   #70
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It is the easiest fix in the world and takes less time then brushing your teeth. Just burp the system and call it good.
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Old 11-19-2012, 06:41 AM   #71
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I think you guys are accidentally giving bad advice. There are some cases where air pockets in the cooling system may occur normally on certain vehicles. After a while, these air pockets will work themselves out.

On the new JKs, it's NOT normal and it's probably a sign that you've got the common heater core problem. If you are hearing the "water gurgling" behind the dash, it's probably because your heater core is partially clogged. You will notice that when the outside temperature falls below 35 degrees you will not have good heat reaching the vents on the driver's side of the vehicle. You need to get this fixed. Don't ignore the "gurgling noise" as if it's normal. It's not and it's a sign of a failure on this particular vehicle.
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Old 11-19-2012, 06:49 AM   #72
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I think you guys are accidentally giving bad advice. There are some cases where air pockets in the cooling system may occur normally on certain vehicles. After a while, these air pockets will work themselves out.

On the new JKs, it's NOT normal and it's probably a sign that you've got the common heater core problem. If you are hearing the "water gurgling" behind the dash, it's probably because your heater core is partially clogged. You will notice that when the outside temperature falls below 35 degrees you will not have good heat reaching the vents on the driver's side of the vehicle. You need to get this fixed. Don't ignore the "gurgling noise" as if it's normal. It's not and it's a sign of a failure on this particular vehicle.
Who's giving bad advise??? Certainly not those who are saying to try burping the system. AND incidently.... it is pretty easy to test and know if you have air in there by squeezing the top , large radiator hose once the motor is warm and the thermostat has opened. If it is soft, there is air. If it is hard and you can't make the sides touch each other then there is none and it is not normal for air to get in on a closed system like on the JK.
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Old 11-19-2012, 07:57 AM   #73
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Who's giving bad advise??? Certainly not those who are saying to try burping the system. AND incidently.... it is pretty easy to test and know if you have air in there by squeezing the top , large radiator hose once the motor is warm and the thermostat has opened. If it is soft, there is air. If it is hard and you can't make the sides touch each other then there is none and it is not normal for air to get in on a closed system like on the JK.
x2 and if there is air it is easy to burp it out just pop the radiator cap and slowly squeeze/pump the hose and watch for the burp(s) lol. Mine did it, I burped it and no more gurgling and heats up fast and the same on both sides.
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Old 11-19-2012, 08:03 AM   #74
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There are multiple documented cases of dealerships burping the systems on these JKs and not solving any problems by doing so. The sloshing sound people are hearing is the heater core filling back up when the engine is started. These JKs usually have faulty heater cores. It's not as simple as just burping the system.

So yeah, telling a guy with a 2013 to "burp it and not worry about it" isn't very good advice. I think he should take it to the dealership.
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Old 11-19-2012, 08:26 AM   #75
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Originally Posted by CrushUnltd View Post
My brand new 2013 sport unlimited makes the burbling sound for 20 seconds at start up. Everything else works fine. What's the downside if I just ignore it?
I'm still mystified by this sound. My 08JK has 48k on it, and does it now & then....some times louder & some times hardly at all.

Mostly when cold from sitting over night, but sometimes during the day after sitting for an hour or two.

Never any coolant level changes.

Heater works perfectly.
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Old 11-19-2012, 09:18 AM   #76
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x2 and if there is air it is easy to burp it out just pop the radiator cap and slowly squeeze/pump the hose and watch for the burp(s) lol. Mine did it, I burped it and no more gurgling and heats up fast and the same on both sides.

So you'd try this on a cold or warm engine? Do you need an incline?
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Old 11-19-2012, 09:29 AM   #77
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I have a '13. Mine made this sound. I burped it, and used fluid from the overflow tank to fill up the radiator completely, squeezed the hose a few times, did this process about 3 times, and now, no more sound behind the dash.

It seems like the radiatior gets partially filled at the factory, fluid gets poured in the overflow, but they don't burp the system. Doing the above over a two day period to get all the air out of the system solved my noise.
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Old 11-19-2012, 09:31 AM   #78
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So you'd try this on a cold or warm engine? Do you need an incline?
I did mine on the level, I removed my cap and let it warm up/run while squeezing/pumping the upper hose. you can see the bubbles. keep adding coolant as needed. I did not actually have to add much coolant. my coolant overflow was under the add mark when stone cold when I started and now when it is stone cold it is just above the add mark.
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Old 11-20-2012, 04:39 AM   #79
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There are multiple documented cases of dealerships burping the systems on these JKs and not solving any problems by doing so. The sloshing sound people are hearing is the heater core filling back up when the engine is started. These JKs usually have faulty heater cores. It's not as simple as just burping the system.

So yeah, telling a guy with a 2013 to "burp it and not worry about it" isn't very good advice. I think he should take it to the dealership.
Yah! Mine would be one of them!! Mine was burped at the dealer when the pump was replaced and that's when the gurgling sound started !! Once I burped it properly, it stopped. The heater core is filling back up because why?? Because there's air in it!!
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Old 11-20-2012, 04:54 AM   #80
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Originally Posted by johnnyjellybean

Yah! Mine would be one of them!! Mine was burped at the dealer when the pump was replaced and that's when the gurgling sound started !! Once I burped it properly, it stopped. The heater core is filling back up because why?? Because there's air in it!!
Always make sure the heater is on full bore and heat is coming out when burping system!
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Old 11-20-2012, 05:24 AM   #81
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Yah! Mine would be one of them!! Mine was burped at the dealer when the pump was replaced and that's when the gurgling sound started !! Once I burped it properly, it stopped. The heater core is filling back up because why?? Because there's air in it!!
gurgle gurgle. LOL


Sorry, couldn't resist.
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Old 11-20-2012, 01:43 PM   #82
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So if the air coming out of my driver's side vent feels cooler than the other 3 vents that is probably a heater core failure right? I just want to make sure before I go making an appointment with my inept local dealership so I can tell them what to do.
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Old 11-20-2012, 04:27 PM   #83
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^Measure the temp of each vent and let us know.
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Old 11-20-2012, 05:04 PM   #84
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gurgle gurgle. LOL


Sorry, couldn't resist.
Gurgle gurgle BUUURRRP!

Sounds like a night out!
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Old 11-20-2012, 05:05 PM   #85
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Always make sure the heater is on full bore and heat is coming out when burping system!
^^This^^
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Old 11-20-2012, 05:20 PM   #86
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Ive had my jeep for 2 months and only 800 miles on it so far. I here it every now and then. For some reason im not concerned about it. Ive heard of sevral ppl having this issue it everything being fine.
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Old 11-20-2012, 05:38 PM   #87
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I've had this same thing on my 08 JK Sahara. My heater works fine and have not had any issues with it. I've only had it for 2 weeks but my heater works fine. It did freak me out when I heard the swoosh for the first time 2 days after purchase.
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Old 11-20-2012, 07:46 PM   #88
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Always make sure the heater is on full bore and heat is coming out when burping system!
This is a myth.
1) As long as the engine is running the water pump is circulating coolant thru the system including the heater core.
2) Running the fan on high speed has no effect on whether air is trapped the cooling system.
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Old 11-20-2012, 07:52 PM   #89
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There are some vehicles including some Jeeps that do NOT cycle coolant through the heater core unless the heat is turned on at the HVAC controls. I think this myth stems from that. Apparently the JK does not have these check valves however so it shouldn't matter for us.
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Old 11-20-2012, 08:59 PM   #90
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There are some vehicles including some Jeeps that do NOT cycle coolant through the heater core unless the heat is turned on at the HVAC controls. I think this myth stems from that. Apparently the JK does not have these check valves however so it shouldn't matter for us.
Yeah, back in the day, heater valves were fairly common on automobiles, especially ones with AC. They ones that operated off of vacuum or a cable could be a PITA to keep working. Very rare these days. Military Humvees still use them.

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