98 Malibu 160,000

When we went on a trip I started smelling antifreeze smell coming from under the hood after we would stop.
we have replaced thermostat, waterpump, bled line, everything that the chilton manual said to do. It isnt running hot by the temp on the gauge
but car is still losing coolant from somewhere around the thermostat. We see steaming and hear a gurgling
kinda (from the drivers side when your standin in front of the vehicle) when u crank it and use accelerater to warm it up? ?