Question about 2001 Jeep Grand Cherokee
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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Posted on Jan 02, 2017
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