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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