twojeeps Posted April 4, 2008 Share Posted April 4, 2008 new radiator, new thermostat, no CAT issues and still tank is boiling over........ should I replace tank???? i did get all air out of the system 88 MJ 4.0 THANKS!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
brigarpeon Posted April 4, 2008 Share Posted April 4, 2008 If you changed the Thermostat then it probably has an air lock in the cooling system. Link to comment Share on other sites More sharing options...
twojeeps Posted April 4, 2008 Author Share Posted April 4, 2008 how do i fix that Link to comment Share on other sites More sharing options...
brigarpeon Posted April 4, 2008 Share Posted April 4, 2008 The proper way to do it is fill it,and run it for a while shut it off ,purge it,,or burp it,,you can do this by squeezing on the top radiator hose,,it will help force any air bubbles out of it,,then start it again,,keep a check on the coolant level in the bottle,,make sure it stays full,two times should do this one,,and make sure the heater is on all the time your doing this,,have the temperature on hot all the way ,this helps circulate the coolant a lot better. Link to comment Share on other sites More sharing options...
maddzz1 Posted April 4, 2008 Share Posted April 4, 2008 Could also be a hose collapsing. Did you replace the hoses? If so you need the one with the spring in it or take the spring out of old one and put in lower rad hose. Could also be water pump. Link to comment Share on other sites More sharing options...
twojeeps Posted April 4, 2008 Author Share Posted April 4, 2008 hoses are fine...... guess water pump is next, didn't really want to tackle that. i think its burped pretty good. its still boiling over should i replace coolant tank before water pump?? bought a new one today at dealer, was hoping i could take it back THANKS Link to comment Share on other sites More sharing options...
maddzz1 Posted April 4, 2008 Share Posted April 4, 2008 Just make sure you get the reverse direction water pump Link to comment Share on other sites More sharing options...
brigarpeon Posted April 4, 2008 Share Posted April 4, 2008 When it boils over it just adds more air to the system, it doesn't burp it. To do this you have to start it let it warm up but not get hot then cool down. Repeat 3 -4 times. Bleediing/Burping is Not blowing out all the coolant and then adding more til it's full, you will still have the same problem. Usually if a water pump needs replaced for internal wear it will be in warmer weather when the vanes on the pump that are worn down can not pump enough water through the radiator to keep the engine cool. Are the belts worn? Slippage can make it act like a bad pump. Link to comment Share on other sites More sharing options...
twojeeps Posted April 4, 2008 Author Share Posted April 4, 2008 i think i finally got it! started it, let it run a while, let it sit, filled the tank up more, did this a few times, let it run a while, drove it a few miles and it didn't boil. got my fingers crossed thanks for the help! Link to comment Share on other sites More sharing options...
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