Question about 2001 Jeep Grand Cherokee

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Leaking water When i turn the engine off after driving a get a small puddle of what looks like water coming from the front of my vehicle. The radiator and thermostat have both been replaced. The engine isn't overheating but the hot air/heater doesn't get very hot. any ideas???

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  • steveng25 Sep 09, 2008

    It appears to be the expansion tank because that is constatntly low. It happened once before the replacements, thats why i had it replaced. then after the replacements it ran hot once and the mechanic put another thermostat in and said that the other one had probably gotten stuck. now it doesnt run hot, just leaks alot.


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OK. I was trying to establish whether you definately have a coolant loss & it's not water dripping from somewhere else - i.e. condensation from the air conditioner.
The cooling system is designed to build up & maintain pressure, usually about 14psi & is controlled by the pressure cap. This pressurisation raises the boiling point of water to approx 115 degrees Celsius. Unfortunately this makes the system prone to leaks. You obviously need to establish where the leak is from & this is usually done by pressurising the system with a hand held pump, noting/confirming a pressure loss and then visually checking for the leak. It sounds obvious but make sure you're not overfilling the expansion tank as some room is required to allow for expansion of the water. The pressure cap should be checked to make sure it's not weak. If you haven't got access to a pressure tester it'll be a question of running the engine to operating temperature & searching for the leak with a torch (flashlight). If it only leaks when the engine is switched off then the most likely cause is the water pump.
Hope this helps.


Posted on Sep 11, 2008

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Are you losing water from the radiator or expansion tank and need to keep topping up? Did the fault occur before the radiator & thermostat were replaced or only since?

Posted on Sep 09, 2008

  • Steve Watts Sep 11, 2008

    Oops! the long comment from 'Guest' is from Jimmy yeah.


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