Overflow boiling and more
Thread Starter
JK Newbie
Joined: Oct 2020
Posts: 3
Likes: 0
From: St James New York
Overflow boiling and more
Crazy stuff drove 3 1/2 hours got out of the JK and the overflow is boiling with antifreeze shooting out
I let the engine cool down checked levels all good started it again overflow started to boil over in 10 minutes then I turned on the heat The level went down and it stopped boiling
drove home 3 1/2 hours with the heat on no problems the following day I replaced the thermostat all good for about two days then the overflow started to boil over again then I replaced the cap all good for a couple days then I drove about 10 minutes lifted up the hood and found the upper hose collapsed and overflow starting to boil again the radiator is two years old the oil is clean do I have air block in the radiator ? Should I flush out the radiator I don’t think the upper hose needs to be replaced what do you think thanks
I let the engine cool down checked levels all good started it again overflow started to boil over in 10 minutes then I turned on the heat The level went down and it stopped boiling
drove home 3 1/2 hours with the heat on no problems the following day I replaced the thermostat all good for about two days then the overflow started to boil over again then I replaced the cap all good for a couple days then I drove about 10 minutes lifted up the hood and found the upper hose collapsed and overflow starting to boil again the radiator is two years old the oil is clean do I have air block in the radiator ? Should I flush out the radiator I don’t think the upper hose needs to be replaced what do you think thanks
JK Jedi
Joined: Dec 2010
Posts: 5,642
Likes: 486
From: Knoxville
I saw this on a TJ recently. Same deal though- replaced the cap, thermostat, etc and drove it 8 hours without issue, then lost all coolant. Radiator ended up getting replaced but I'm not sure the end results on that project as it wasn't my toy. I'd be curious to see what you end up finding is the problem though.
JK Jedi
Joined: Jun 2013
Posts: 11,362
Likes: 2,089
From: Willow Park, TX
have you checked the overflow hose itself? So you're getting a vacuum situation which is what's making the coolant in the resi to "boil". I see this when vacuuming liquids in my chamber vacuum packer at home. (Have never understood it if is really hot or if it just appears to have that same effect and boiling). If it's not the cap having an issue releasing pressure, it could be the hose itself is blocked.
JK Junkie
Joined: Feb 2012
Posts: 3,499
Likes: 162
From: brick, nj
My 2012 had an overheating issue. It was caused by a loose wire connection to the battery. It was a small wire that I think is called a fuse link and it is related to control of the cooling fan. Connection was tightened and never had another problem.
Thread Starter
JK Newbie
Joined: Oct 2020
Posts: 3
Likes: 0
From: St James New York
i’ll check it but the funny thing is when the engine is cold takes about 10 to 15 minutes to boil over and the hose collapses when I turn on the heat For three minutes the overflow goes down then I shut off the heat and that seem to solve The problems it’s only when the engine is cold that The boil over occurs
have you checked the overflow hose itself? So you're getting a vacuum situation which is what's making the coolant in the resi to "boil". I see this when vacuuming liquids in my chamber vacuum packer at home. (Have never understood it if is really hot or if it just appears to have that same effect and boiling). If it's not the cap having an issue releasing pressure, it could be the hose itself is blocked.
Thread Starter
JK Newbie
Joined: Oct 2020
Posts: 3
Likes: 0
From: St James New York
all wires are intact and the fan does kick on and off
