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2013 GT GLS. 50K km. I am hearing the sound of running water trickling when I start the engine for awhile. seems to be getting more pronounced with time. what could this be?.
 

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You hear this sound while inside the car? Possibly be heater core has air in it, usually caused by low fluid level. I'd check there first. If that is good, make sure your not just hearing the A/C system equalizing pressure.(usually more of a hiss and gurgle sound)
 
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