Air Con High Pressure Switch - Location of part?

[ProjectGT]

Can anyone describe where to find this on the Air Con system of an S3 8l 1.8t?

Picture/s would be ideal.

Thanks.

 

[tcg]

Located in front of the bulkhead hidden behind the heatshield. Looking from the front of the car it is slightly off center to the drivers side.

 

[ProjectGT]

That is so helpful, thank you very much.