I drive a GTP 6 speeder in Montreal (Canada). When we get some heavy snow or rainfalls, there is some vapor coming out from the front grill. It is quite noticeable, even when I shut the engine off. Looks like water hits the radiator grill and goes boiling. Also, I get a cracking from what seems to be a heatsheild cooling down. The craking migth stay for more than 5 munites after the engine is shut off. The temperature gage is normal.
I imagine if this his a normal situation, than all G6's should do the same thing...
Sounds normal. IF yuou are seeing the rain hit the radiator then that is most likely what the vapor is, I've noticed a tiny bit ony my car but its barely noticeable. As for the cracking I've heard cars that do it an hour after having been driven for a while.
It doesn't get that cold here so I wouldn't notice any vapor. The popping noise you hear is normal, my dad's Ford truck does the same thing. Lots of aluminum in new vehicles and they pop when they cool down.