I have an idea as to what this is but I am not sure.
My truck has a running water/gurgling sound when I run it just after start up. I'm thinking this is the water running to the heating unit in the dash but I have never heard the running water sound in other vehicle, is there something I need to check out?
On a semi related topic, there is a sharp curve in the road that I live on and when I have my heat on and I go around that curve, it gets cold in my truck...its very weird, is this something that has ever happened to you when going around a sharp curve? The curve is drawn out below and it only happens when I am going the direction of the stated arrows. Don't hate my Paint skills!