Question about 1990 Jeep Cherokee Limited

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1995 jeep cherokee overheating...oil getting into coolant system.

Hello! Been having the brown water for 2 years.  Car overheats generally in summer months. Changed thermostat, and upper radiator hose, also used garden hose to flush out radiator while thermostat housing was off. I did this work on Monday.  Ran car in park with A/C on for 20 minutes.  No problems.  Also have been running small errands since, with no overheating...until today.  I was close to home when I saw the light come on.  Checked engine, and light smoke was coming from engine.  I have seen this before in the past, but have also driven many miles with no problems.  I know I have oil mixing in the coolant, because when I flushed, there were small beads of oil in that dirty water.  So, I know either my head is cracked, or I have a crack in my block.  I also do have a small oil leak coming from the head.  Just looking for some guidance.  PLEASE  hehehe

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  • veryodd Jul 29, 2009

    THANK YOU...that was fast. I was going to do that. Never did it before. Looks It's a 4.0.

    In the manual, for my engine I understand how to drain the cooling system, and to disconnect the hoses at the thermal housing.
    STEP# 4 says to "properly relieve the fuel system pressure. (don't understand)
    also
    STEP # 6 Loosen the rocker arms (???)
    STEP #7 Remove the pushrods (???)

    By the way...when I change this...is there a way to see if I do have a cracked head? Thank You :)

  • veryodd Jul 29, 2009

    Thanks guys! This looks like something I better bring to the shop!

  • veryodd Jul 30, 2009

    UPDATE!!!

    I had my head gasket changed at pep boys. Shortly after I left, I noticed the brand new upper radiator hose was flattened and very hot. (overheat light did NOT) come on. brand new coolant from Monday after partial flush was pretty brown again. I added water while running my car, and the upper hose did pop back out. It is still very hot. Right now, I have the pet cock opened and have a hose running water into the radiator. Any other ideas? Could the thermostat be faulty? Something clogged? Is it better to remove the lower radiator hose and turn on the heat while running the car and flushing?
    Thanks for all of your help guys!

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Try changing head gasket and this may sort your prob. could poss be a cracked head though

Posted on Jul 29, 2009

  • nick781984
    nick781984 Jul 29, 2009

    step 4 undo fuel line and allow to relase it pressure, you should here it hissing then stop.

    undo rocker arms not for the faint hearted as these have to be proply adjusted before starting back up or will bend all valves!!! you should be able to see the crack in head, but if you want an accurate response get it pressure tested

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You may not have a cracked block.it may only be the head gasket.it's major work anyway you look at it,so have your mechanic take a look and tell you for sure.

Posted on Jul 29, 2009

  • Bill Johnson Jul 30, 2009

    try first now that you have come this far,take out the thermostat, run your car without this in ,and without the filler cap on,let your car run look to see if the fluid is moveing thru the radiator,if so the pump is good if not the pump is bad.hope this helps.

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I am having same problem with mine. Overheating oil in water but no water in oil I don't know what to do?

Posted on Aug 16, 2015

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I have a 1995 jeep cherokee country 6 cyl. it has been runing hot i took it to pep boys and they said that antifreeze mixing with the oil in the top or valve cover you can this mud like stuff but the oil pressure has stayed in the same spot at 40 it the idel is good and the is no sign of water mixing with the oil on the dip stick it,s just looks like oil so i don,t know what to do get a new valve cover and gasket maybe that might work like i said i don,t no what to do next

Posted on May 25, 2011

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