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Unread 07-01-2010, 07:26 AM   #1
kin22kaid
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05 Rubicon Antifreeze boils

Need help, I can hear my antifreeze boiling after driving on hot days! I have changed thermostats twice now and did a full system flush. I put fresh prestone 50/50 with water wetter and it still boils or at least that what it sounds like. Radiator is clean on the outside and is dent free. Any suggestions?

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Unread 07-01-2010, 08:58 AM   #2
ikadesh
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Sounds to me like a water pump issue. If you are not getting proper flow of water through your engine, then the motor heat is escaping through the boiling of antifreeze. That is, until all the antifreeze boils away, which usually occurs after about 20 miles of highway driving in average temperatures.
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Unread 07-01-2010, 12:10 PM   #3
greyarea
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what is the gauge reading
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Unread 07-02-2010, 03:05 AM   #4
oakmckinley
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Somethings not right for sure, either the bottle of prestone you got wasn't 50/50 or you had alot of water in your system when you added the antifreeze and dilluted it to more like 70/30.
Ethylene Glycol boils at 390F and water at 212F, I would hope that even in hot weather your running around 220F engine temp.
Is your thermostat opening, maybe the coolant isn't getting a chance to go through the radiator?
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Unread 07-02-2010, 12:02 PM   #5
kin22kaid
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Thanks for the info! The gauge on hot days and driving on highway reads a little over an 1/8 of a inch past 210. I have only lost antifreeze 2 times now both times it was after the engine was turned off. Boiling noise and then came out the overflow.
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Unread 07-03-2010, 05:12 AM   #6
RubiconBlack
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My 04 Rubicon does the same thing! I was concerned about it at first but its never over heated on me and left me stranded. It usually does it after I get off the highway on really hot days and when I shut it off I can here it boiling. I haven't seen any issues with other Wranglers working at a Jeep dealership. Hope this helps.
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Unread 07-05-2010, 06:54 AM   #7
kin22kaid
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Today I am going to replace the upper and lower hoses along with a new pump and while I'm at it another thermostat and refill with fresh 50/50. Hopefully the boiling stops! If not I am at a loss.
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Unread 07-05-2010, 11:13 AM   #8
kin22kaid
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At my auto parts store I was talking to a guy at the counter and he talked me into replacing the cap and burping the system. Thank God that worked!!!! The lower seal on the cap was cracked and that let air into the system. Thanks for everyone's help!
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Unread 07-05-2010, 07:51 PM   #9
RubiconBlack
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Awesome glad to hear your problem is fixed!
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coolant , antifreeze , boil , rubicon , TJ , 4.0
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