Question about 2000 Jeep Grand Cherokee

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Low Coolant light always on put new coolant in and it disappears

I have a 2000 Jeep Grand Cherokee Laredo there had been a recall on the cooling fan and relay and that has since been replaced twice. Now my coolant low light goes on all the time. I put new coolant in the reserve but after a few miles it is all gone and not on the ground. I hear a swishing side from under the passenger side dashboard that sounds like fluid but the floor is not wet. I have had the water pump replaced and new radiator. recently the oil gauge goes high and then low had an oil change still the same problem. The tempature gauge now goes hot but the engine is not hot or steaming and then all of  a sudden it is fine again. WHERE IS THE COOLANT GOING and why are the gauges going crazy. I have also replaced thermostate. Don't knowwhat else to do.

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  • burpe98 May 26, 2009

    Thank you so much for all the help guys. I took my car this afternoon and I will find out soon enough. I will let you all know

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Where the coolant is going and why the gauges go nuts are probably not the same problem. sounds like your gauges have a problem with the ground side connection to power. you could look at the negative battery post and see if it is really gunked up, might as well check the positive side while you are looking. if the battery posts get oxidized pretty much everything gets a not so great connection but gauges are one of few places you notice it. the car only runs off the battery at startup or if momentarily car is using more amperage than alternator can provide, but current runs through battery from alternator so bad connection there will cause whole system to function less than optimum. in the cooling system one component you don't mention replacing is the heater core. you say the coolant is not on the ground, so where can it be? pull your oil dipstick and see if your oil looks like oil. if it looks like vaseline, kinda white and creamy, you just figured out where your coolant went and you have a blown head gasket. hope that's not it, it's sort of a hassle. there aren't too many other places for the coolant to go. it either runs on the ground, boils off against the hot block, like if it comes out near an exhaust manifold (and that makes quite an odor) or gets into the oil through blown head gasket. it can make it into the passenger compartment through a leaky heater core and if that happens you will smell a sort of sweet smell in the car and after while get a green cast to condensation inside windows. hope that helps.

Posted on May 26, 2009

  • kozmikkurt Aug 12, 2014

    Another possibility is that you need a new radiator cap. I fthat is not sealing properly, it can allow the coolant to boil, and if the leak is not big, you might not notice the slow loss of coolant through boiling/evaporation.

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I have had my 2000 Jeep Grand Cherokee
sitting in the garage for the past two months already and all to a blown head gasket. How? The same thing happened to me with the low coolant light coming up, then the temperature gauge started going up then down. I also replaced the thermostat and a week later I had to keep adding coolant, and then I checked the oil to find it milky......now I need to replace the engine because just fixing the head gasket doesn't guarantee me it won't happen again.

Posted on May 26, 2009

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Posted on Sep 17, 2013

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