If you have coolant on the ground at the front of the engine I would check to see if you can see any dipping from the edge of the under tray. If you do then you most likely have a leak up front which could indicate that the water pump is on the way out, or it could be a loose clamp. Leakage from the over flow of the expansion tank should be near the back of the engine on the right sire where the overflow hose dumps it.
Based on my experience I would say you can expect some pressure in the expansion tank 1 1/2 hours after a drive but the coolant should have cooled down enough so that slowing opening the cap allows the pressure to be released without resulting in flash boiling. Agree, a little gurgle may he heard depending on how hot the coolant still is.
If you are going to tell someone how to remove a bolt you should at least know which way to turn the wrench.
85 308 GTB QV red/tan (original owner)
95 F355 Spider SwatersBlu/tan