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Unread 07-26-2011, 08:41 PM   #1
MORunner
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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.

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Unread 07-26-2011, 08:45 PM   #2
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Coolant overflowing into the reservoir.
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Unread 07-26-2011, 08:50 PM   #3
tailhole
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Get a new rad cap
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Unread 07-26-2011, 09:00 PM   #4
danica789
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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.
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Unread 07-27-2011, 07:32 AM   #5
MORunner
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So is that normal MayRoll? Assuming it's doing what it is designed to do when it get hot, but maybe not.
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Unread 07-27-2011, 12:16 PM   #6
mightydog78
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get a higher pressure rated radiator cap than the stock. everyone always recommends that.
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Unread 07-27-2011, 12:35 PM   #7
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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.
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Unread 07-27-2011, 12:56 PM   #8
BYuen
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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.
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Unread 07-27-2011, 02:55 PM   #9
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Quote:
Originally Posted by BYuen View Post
with the heat on high.
Why?...
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Unread 07-27-2011, 06:20 PM   #10
mightydog78
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Why?...
so the fluid runs through the heater core and hoses. I guess to get any air pockets out?

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Unread 07-27-2011, 06:35 PM   #11
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so the fluid runs through the heater core and hoses. I guess to get any air pockets out?

"..."
^that is your trademark sire
With a TJ, when the engine is running the coolent is always flowing through the properly operating heater core...
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Unread 07-27-2011, 07:11 PM   #12
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I have always heard the bubbling after I have shut off my Jeep. I always thought it was normal
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Unread 07-27-2011, 07:38 PM   #13
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You may also be hearing oil trickling back into the oil pan...
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Unread 07-27-2011, 10:07 PM   #14
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That was my thought. I hear it draining back into the pain everynight when I get home and it's quiet in the garage.
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Unread 07-27-2011, 10:44 PM   #15
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Quote:
Originally Posted by danica789 View Post
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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