Simply disconnect it at the right fender area unless you're concerned about the pristine air in Austin. Like the above poster noted, it only spins for the first 30-45 seconds (when temp needle hits first peg above 40) so I don't think even the most environmentally sensitive would be offended.

Just make sure your car is fully warmed up next time you go in for an inspection -- that is if Austin has smog checks now, not sure if they do.... here in Houston it's required. I disconnected mine, and didn't get a CE light, but do have a stored fault code, but due to a vacuum line disconnected I think.

G'luck

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi