Hi I have a S5 Turbo and Im running a microtech lt10c, the car still has AC and it still works, however the bac is disconnected and the car has the factory ecu to control the electric OMP, Suppose I removed the stock n374 ecu, can I still make the ac work like stock? can I wire in the BAC to the microtech aux input? If I can, will the compressor cycle ON/OFF when the ac switch on the dash in pressed in? Im confused on how the system works and dont know if the factory ECU controls the system or if it is the switch on the dash and the pressure switch that does all the work when the AC is on, thanks

 

The switch on dash controls the aircond not the computer It is a completely separate system to computor

 

Best bet would be to connect the BAC to the Microtech, then use the aux input to add BAC duty when the A/C is switched on.

 

It doesn't do a very good job of that