Quote Originally Posted by Dolphin S4 View Post
Can anyone post a link to the secondary thermostat location and part number ? I'd like to do both. My car doesn't warm up quickly on colder days.
Aux thermostat:
http://www.ecstuning.com/Audi-B6_S4--V8/ES436132/
Pricy, but dont know if you can purchase it without the hoses.

See the part diagram here:
https://www.proj-build.com/build.php...chapter_id=499
Half way down the page, part number 12.