My 2006 G35 coupe is running hot. It's not running rough at all. I had new radiator, thermostat, & fans installed about 3-4 months ago & it's done fine til now. It SEEMS like the thermostat may be stuck, but ?. Any ideas? Thanks in advance!

 

Remove thermostat and throw it in boiling water it should open at 170/180 degrees or so.

 

Moisture at startup is common due to the hot exhaust fumes going through the cold exhaust pipes. This could be viewed as steam or water dripping from the tailpipe or joints. This moisture usually doesn't smell from this kind of temperature difference moisture. If you have coolant in your exhaust, the clouds could be very white and dense, it will happen even when the exhaust is warmed up, and you might even smell a sweet smell from the exhaust.

If thermostat is stuck open or closed, feel for the temperature of the coolant return line. Obviously be careful doing that or get an indirect temp gun.