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-   -   Bubbling or Gurgling Sound from Engine (http://www.jeepforum.com/forum/f9/bubbling-gurgling-sound-engine-1244990/)

MORunner 07-26-2011 08:41 PM

Bubbling or Gurgling Sound from Engine
 
Noticed it for the first time tonight when I pulled it into the driveway. The sound continued for a good 3 to 5 minutes after I shut if off and seemed to come from the engine. The engine was definitely hot from some in town driving on a very warm night with the A/C blasting. The temp guage measured where it always does, around 210ish. I checked for leaking around the radiator and didn't see anything. No other complaints in terms of power or performance. I'm a new Jeep owner (just bought my 2000 Sahara a few weeks ago) so I'm slowly learning what is and isn't typical on a Jeep. Can any other Jeep owners let me know if they've experienced something similar and if it's normal.

MayRoll 07-26-2011 08:45 PM

Coolant overflowing into the reservoir.

tailhole 07-26-2011 08:50 PM

Get a new rad cap

danica789 07-26-2011 09:00 PM

I get the exact same sound. I have replaced the rad cap and I dont see much fluid in the reserve. When i take the rad cap off, the fluid is to the top. I dont see any fluid movement, but you can hear it.

MORunner 07-27-2011 07:32 AM

So is that normal MayRoll? Assuming it's doing what it is designed to do when it get hot, but maybe not.

mightydog78 07-27-2011 12:16 PM

get a higher pressure rated radiator cap than the stock. everyone always recommends that.

oldmots 07-27-2011 12:35 PM

The sound is coolant boiling at hot spots in the cooling system. It can be caused by low cooling system pressure or overheating. When the engine is shut off hot, the hoses should be hard for a little while, if they are not, you have low pressure.

BYuen 07-27-2011 12:56 PM

Get a new radiator cap from Napa or similar. 18 lbs is the factory rating. They are really cheap. You might also have some air trapped in the system. To burp the system, start the Jeep cold with the radiator cap off and let it get up to full operating temp with the heat on high. Then put the new cap on and you shouldn't have anymore gurgling.

Knuckelhead 07-27-2011 02:55 PM

Quote:

Originally Posted by BYuen (Post 11925384)
with the heat on high.

Why?...

mightydog78 07-27-2011 06:20 PM

Quote:

Originally Posted by Knuckelhead (Post 11925910)
Why?...

so the fluid runs through the heater core and hoses. I guess to get any air pockets out?

"..."
^that is your trademark sire :D

Knuckelhead 07-27-2011 06:35 PM

Quote:

Originally Posted by mightydog78 (Post 11926812)
so the fluid runs through the heater core and hoses. I guess to get any air pockets out?

"..."
^that is your trademark sire :D

With a TJ, when the engine is running the coolent is always flowing through the properly operating heater core...

phillies4752 07-27-2011 07:11 PM

I have always heard the bubbling after I have shut off my Jeep. I always thought it was normal

freeskier93 07-27-2011 07:38 PM

27 Attachment(s)
You may also be hearing oil trickling back into the oil pan...

conrasm 07-27-2011 10:07 PM

That was my thought. I hear it draining back into the pain everynight when I get home and it's quiet in the garage.

oakmckinley 07-27-2011 10:44 PM

Quote:

Originally Posted by danica789 (Post 11922358)
I get the exact same sound. I have replaced the rad cap and I dont see much fluid in the reserve. When i take the rad cap off, the fluid is to the top. I dont see any fluid movement, but you can hear it.

I would add coolant to the overflow.
When the system is hot it expands to the overflow and when it cools it pulls from the overflow, if the overflow is empty or near empty, it's pulling in air.


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