Originally Posted by chenry
What is this for - and why is it positioned so close to the exhaust/turbo (I think) / and is there any benefit in keeping it open all the time (it seems to be vacuum actuated - I may be wrong)
It's main use is to provide warm air. It's a very similar looking setup to my previous VR6. Helps alot in warming up the vehicle in cold weather. For the warm weather folks it probably doesn't get used to much.\
Once the weather cools down, I'll try and get some readings to see how fast a diesel can warm up in -30 weather.