Originally Posted by steveinky
Look at the Audi OEM crappy quality plastic "T" fitting near the front of the expansion tank. When these crack they will drip on the left side of the engine and the coolant will evaporate creating that smell with no coolant visible.
Just had mine snap on the weekend... pissed me off to no end .. especially after i drove acoss town for a replacement and dropped it in the engine bay ... gone forever .. across town for another .. ..
OP i think if you smell it near the engine you definitely have an external leak .. you just have to keep ooking . If you smell it up front thts where it is .. have someone rev the engine while you are up front looking ( be carefull ) this will kick the water pump into high speed and you may see something.