Ok, looking for opinions on what's wrong. 97 S-10 pickup. Sometimes when I accelerate hard, there's a gurgling / water pouring noise coming from the dash.
I guess it's related to the heater core but I can't tell. The coolant level is not going down, the truck never overheats, and there's nothing leaking inside the cab or under the truck.
I also thought it might be rainwater that got trapped in the cowl and was running out, but the last time it made this noise, it had been sitting for 6 weeks with no rain in south GA and was dry as a bone.
Any suggestions?