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I had this happen on my 2001 S-10. I had a very slow coolant leak and when the coolant would get low I could hear what sounded like water flowing from around the heater. At first I thought I had water built up inside the A/C evaporator which was gurgling, but finally realized it was a coolant problem.

Once I fixed my leak and topped off the coolant the noise was gone.

Hope this helps.

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Q: You hear a flowing water sound on start up it sounds like it may be coming from the heater core?
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