There are no drain/vent holes on the fitting for the temperature sensor.
You could just buy a new sensor that comes with a new O-ring and correctly install it with lube (coolant can be used). This will stop your leak as described by you.
Some buy the O-ring separately, but dealer does not sell it that way. A new sensor will not hurt anyone. Is cheap.
Lower coolant by draining at the radiator bottom drain fixture. Careful as it is plastic.
Remove ET cap when doing this.
Are you known to your friends as "mr. nothing"?
Last edited by Stinger9; 11-28-2012 at 12:20 PM.