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Water sloshing noise behind glovebox area

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I have a 1998 ZJ 5.2 and I hear water sloshing around behind the glove box, passenger side area, does anyone know what this is caused by and encountered it? if so, what is the correction?
thanks
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Heater core is in that area, and the water sloshing most likely means there's air trapped in the heater core. Check the coolant level in radiator and coolant overflow tank.
 

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I had this ! but it turned out to be a quart bottle of carbonated water that rolled under the passenger seat and was lodged. I never before had a Jeep that was quiet enough to allow me to hear such a faint sound. I am still laughing a year later, as I was looking up heater cores, etc. etc.
 
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