I did the electric fan conversion on my 2001 silverado with 4.8. I used a factory harness and a factory fuse/relay block i also put a ac pressure sensor in so computer could operate the fans. The fans work on stage 1 as they should. But the stage 2 doesn't activate with ac pressure. Ive obviously either did use the correct settings or my sensor is bad. I have it set to 2 fans and analog cycling. Please help