Yup, what he said. With the outside air off, the whole system works more effectively and moves more air. So when you turn the ac on max cooling, the outside air gets turned off and you only have to cool the inside air

__________________

7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake