I need to know how to get the ac to work on a s5 t2. I want to know if i have to use the bac valve on it.

 

using a micro tech ltx8

 

Best way i have found to get it to work.
get a solenoid(like used in the factory fc that idles up when activated).

Get the a/c wire that goes directly to the compressor and get it to trigger the microtech via the blue/red wire and also trigger the solenoid, this means you can add more fuel from the microtech using the auxiallary input and the solenoid will idle the car up when ever the compressor is on.

 

Thanks alot i will give it a try.