I have looked everywhere for a Vacuum diagram for the 2009 TC, I cannot find it, if anyone has one I would appreciate it.

MY PROBLEM
There are 4 fittings on the throttle body as well as the throttle electrical connector.

Knowing 2 of them are to bring in warm water to prevent the throttle body from frosting up (freezing) in cold climates and higher altitudes.

1 is for connection to the vacuum switch, my assumption is this one is the main working vacuum source for the car.

What is the 4th fitting for? Is it connected in a Turbo setup? If not should it be plugged or left open?

Could it be the main vacuum connection is below throttle butterfly and the other above?

List of ports
1. Water in
2. Water out
3. Main Vacuum Port
4. ?????????

I would appreciate your knowledge if you have sorted this out

You said 2009 but you are posting in the 2nd gen tc forums? Maybe not the best place.

Thanks will repost in other forum