thanks morris ill start the flush today, i used the chart to set my correct rate of flow but with the ac on alot im not sure how much stays in the cab, ive purged a ton of stuff welding and know how easy it is to lose inert gas, ive seen some co2 moniter/contol for 320 on e bay, i can prob make it happen this tue. i even dropped my cab temp intell i get one. my girls are only 1ft tall right now, im not sure how long i should veg for?