Question about 2000 Jeep Grand Cherokee

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Our Jeep Grand Cherokee 2000 overheated yesterday. We replaced the radiator because it was leaking water and it sill overheats within a few minutes of cranking so we replaced the thermostat. We replaced the water pump a couple of years ago and there is no tattle tale leak or noise from the bearing. We tested the Coolant control sensor and it appears to be fine. Any idea what we should check next?

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  • m4osborne Sep 05, 2009

    My husband is exhausted and wants to know if there is any possible way to check the water pump without taking it out, we did check for a leak and cant hear any noise coming from the water pump.

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Please check all hoses that are connected to the radiator to be sure there is no water leackages.

Posted on Sep 06, 2009

  • Onifade Adewunmi
    Onifade Adewunmi Sep 06, 2009

    There are no other ways than having to remove it to check.

    But try first starting the car within idling and see if water comes out without the ac running.

    Cheers.


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Hi, as you have replaced the thermostat their is only a couple of things it can be the first would be that the water pump has failed you will need to check this.

But first are you sure you have bled all the air out of the system an air blockage will cause the same problem your having. you would need to check in the manual for the best way of doing this.

Even though the water pump is only a couple of years old their is no saying it hasnt failed again have you checked when it gets hot if the top of the rad is hot and the bottom cold if this is the case then the chances are the water pump has gone or the thermostat you put in is faulty. You can check this buy putting the thermostat in boiling water to see if it opens.

Now the part you wont want to hear now this is going to be the head gasket if the water pump is fine the thermostat is fine and you are sure the air is out of the system then the only other real option would be head gasket trouble.
Pull the oil level stick out and check for signs of water poluting the oil it will look greyish color if it looks normal then it dont mean the head gasket is fine just means you will need to get a sniff test done.

A sniff test is a device that you use to put in the top of the water filler bottle then squeeze it a few times and if the liquid in the sniff tester changes color then this indicates that their are gasses getting into the water. This is what would have caused the rad to blow as the pressure will build up in the block and then force its way out where ever it can.

So i would check water pump first but getting a sniff test dont or compression test done would tell you if head gasket has gone.
The vehicle can still run normal with blown head gasket but it will keep boiling up.

Let me know how you get on or if you need further assistance ok

Posted on Sep 05, 2009

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