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Unread 05-19-2009, 01:42 PM   #1
melizmc
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Join Date: May 2009
Location: Arkansas
Posts: 6
Coolant Reserve keeps Boiling Over

I have a 2002 Jeep Liberty Sport.
The temperature gauge doesn't show hot, just half way, however --
Radiator cooling fan will not come on - but the air conditioning cooling fan
does come on.
After driving, when I come to a stop, and kill the engine, the water will boil, it will overflow from the coolant reserve tank. I have ruined several parts in that area, but cannot figure out what is causing the main problem.
I have tried -- changing radiator
changing coolant fan relay
changing thermostat
changing temperature sensor
putting in antifreeze (almost straight)

I am losing my mind over this -- as well as spending every spare dime I work for......HELP - PLEASE!!!!!!

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Unread 05-19-2009, 02:07 PM   #2
SAR-Swimmer
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1997 ZJ 
 
Join Date: Apr 2009
Location: Mission, B.C. Canada
Posts: 752
Hi, don't know much about your type of jeep, but my zj was doing same thing. I too, tried replacing things; fan clutch, thermostat, rad, rad cap, water pump, and nothing seemed to work. Turned out I had gotten a dud thermostat right out of box, replaced it and no problem now. You might also check whether your rad fan is working right, at speed, the airflow through rad will keep things cool, but when you stop there is no forced airflow and things will heat up. Don't know if this will help or not, but good luck.
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Unread 05-19-2009, 02:35 PM   #3
melizmc
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Thanks, there's just something not making the radiator cooling fan come on....after replacing the relay, what else is there?
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Unread 05-19-2009, 02:45 PM   #4
SAR-Swimmer
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1997 ZJ 
 
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Does your fan work ? Can you jump the fan from a seperate power source, to eliminate it as the problem ? Have power to and from relay? Just guessing here, hopefully someone with a Liberty will be able to give you more info.
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Unread 05-19-2009, 02:58 PM   #5
melizmc
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yes, in fact, my husband redirected power to a toggle inside so I manually switched the fan on and off. I want it right, though. It still gets hot enough to boil over on longer trips, so I can't do the fan like it needs to be done. Everything is working, there's just something not telling the fan to come on and cool the radiator off.
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Unread 05-19-2009, 07:07 PM   #6
Fouros
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2004 KJ Liberty 
 
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do you have a mechanical fan as well, the viscous hub might be buggered
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Unread 05-21-2009, 01:02 PM   #7
melizmc
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what do you mean by "hub"
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Unread 05-21-2009, 03:03 PM   #8
LibertyTC
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Colling after shuttoff

If you are on long trips and it is boiling over after shutt down, the answer is to have your own switch that would allowing the fan to continue running for 5 minutes or so after you turn it off. Many other vehicles have this feature but I do not believe the Jeep does. Also it may be advised that if you are coming directly off the freeway to allow it to cool down by idling for 4 minutes before turning it off. We have this problem with large diesel engines in commercial vehicles, and idling allows the engine to cool enough that it does not boil over.
Also there are two kinds of thermostats, ones that fail in the closed position and one called a "failsafe" that will fail in the open position. I always install a failsafe....like it open guaranteed.
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Unread 05-21-2009, 04:44 PM   #9
Fouros
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Quote:
Originally Posted by LibertyTC View Post
Also it may be advised that if you are coming directly off the freeway to allow it to cool down by idling for 4 minutes before turning it off. We have this problem with large diesel engines in commercial vehicles, and idling allows the engine to cool enough that it does not boil over.
Also there are two kinds of thermostats, ones that fail in the closed position and one called a "failsafe" that will fail in the open position. I always install a failsafe....like it open guaranteed.
dude i have only ever heard of allowing a cool down time for Turbo Charged engines before shutting off and thats just to allow the turbo to drop revs before wind down

I live in QLD australia and have NEVER hazd an issue with a boiling engine due to long drive times in an Australian summer ,

yes i have had my KJ boil because the FAN whether it was electrical or Mechanical fail

A viscous "HUB" is an oil filled hub that gets your mechanical fan to kick in only when needed instead of being a drain on power and economy
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2004 KJ with 3" Hybrid OME lift, 4.10 Ratio's and a DTT, Magnaflow cat back, 265/70R16 Hankook MT RT 03 on Moabs, TJM T17 Bull Bar and heaps of other stuff.

1980 CJ7 under restoration
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Unread 05-21-2009, 06:14 PM   #10
richd
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Another word for viscous HUB is a clutch fan.
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Unread 05-21-2009, 08:31 PM   #11
04KJlimited
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im thinking its the coolant sending unit. it never reads hot, like the guage on the dash so the fan wont come on.
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Unread 05-21-2009, 08:34 PM   #12
04KJlimited
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im correcting myself, coolant temperature switch. there is a switch and a sending unit. the sending unit controls the guage on the dash, the switch controls the fan.
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Unread 05-21-2009, 11:12 PM   #13
jeepastur
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My 02 had a water pump impeller spin. Plastic impeller. I found it after changing pretty much everything else. Similar symptoms.
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Unread 05-28-2009, 07:33 AM   #14
melizmc
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Okay, it's the 28th day of May. In the last 2 weeks, I have changed -- thermostat, radiator, cooling fan relay, water pump, coolant temperature sensor, put in about 5 gallons of coolant/water, and 4 spark plugs (not that THAT has anything to do with it). I drive to work 20 minutes, with the air conditioner on, and stop my 2002 Jeep Liberty, and I hear a gurgling noise...then see steam come out from under my hood....the fill tank for water/antifreeze is boiling back out with water/antifreeze!!!!! I am ready to set the damn thing on FIRE!!
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Unread 05-28-2009, 01:58 PM   #15
melizmc
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And by the way, now the radiator cooling fan works, and it still boils over when i come to a stop after a 20 minute drive.
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