2004 Pontiac Grand Prix Q&A

2004 Pontiac Grand Prix Question: water sloshing in the dash

Off and on I can hear water sloshing in the dash. It just started about a month ago and it isnt all the time. I have already had the thermostat replaced 1 year ago and the water pump about 4 years ago. -
Answer 1
Make sure the coolant is full. -
Comment 1
I did check that and added some coolant since it is suppose to be 12 where I live New Years Day. It isnt quite as bad, but I can still hear it sometimes. No leaks anywhere. Should I have it checked by someone? The car has 71800 miles. -
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When I make a turn I hear this noise in the dash, it sounds like water swishing around in the dash. What could be causing that?