hi, the vehicle is a 87 silverado with a 2002 5.3 motor 4l60e trans.
my delima is the a/c request isnt doing chit. ive looked at the schematics and have wired it up correctly, or so i think. what settings in hp tuners would i adjust for the additional load of the compressor. under engine, idle, target idle speed, the values are the same reguardless of a/c on or off.
i have the harness set up like painless wiring and apply 12v to the a/c request and i get bubkiss. i go into vcm controls and turn a/c clutch on manualy and yields nothing either. anyone have experience in this category? im getting frustrated here.. let me know if you have any insite. thanks
clint

 

well it turns out i didnt give the pcm enough time. it takes a few seconds before the computer will bump the idle up and then turn the compressor on. problem solved thanks for the views,
clint