Question about 1990 Jeep Cherokee Limited

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The coolant bottle keeps blowing the coolant out of the cap. What should I check first, the themistatt or something else?

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The vehicle is obviously overheating this could be caused by the cooling fan failing, waterpump failure , blown headgasket, or a failed thermostat. If the cooling fan kicks in I would smell the header tank if it smells like exhaust fumes then the headgasket has failed if that's ok the cheapest thing to change would be the thermostat. If that doesn't work it's probably a failed impeller on the water pump

Posted on Oct 04, 2010

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Try filling the upper hose with it disconnected from engine side, this will get a lot of air out of system which may be the major cause.

Posted on Dec 31, 2010

  • artismo Dec 31, 2010

    when sure it's full, pressure check cooling system for leaks, then determine whether or not it's a head gasket with compression test. if good on all cylinders, then determine whether it's a water movement problem or air movement. cover the front of radiator with carpet or cardboard, if temp goes up, it's air movement. if able to drive it at freeway speed, place in neutral, if temp goes up it's a water movement problem, which is commonly a plugged rad or bad pump. if the water surges in the res, it's probably the thermostat. good luck!



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1 Answer

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You can put it either one or both. If you can see coolant in the bottle with the "engine coolant" cap ( resevoir) then there is no need to open the other. Fill the resevoir to the full mark. If that bottle is empty then you can open the radiator cap ( do not open hot). Do it when the engine is cold because the antifreeze in the rad can be hotter than boiling water and is under pressure. When the engine is cold, turn the cap until it stops, then push down and turn a little more and it will come off. There is a safety tab on it to keep hot coolant out of your face. Fill the radiator slowly until the coolant is about 1/2 to 1" below the neck and reinstall the cap. Make sure you get it on properly, both safety tabs are caught and fully tightened or it may blow off. Then you can top up the resevoir too. Hope this helps.

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1 Answer

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1 Answer

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