Hey Gary. yes, you should take the caps off for blow out. it won't be necessary to put the rotator nozzles back on, in fact the blow out will likely be faster and more thorough if you just leave the spray body empty. Do remember to put the caps or rotator nozzles back on the spray bodies immediately after blow out though, as you don't want debris in the system plugging up your nozzles!

Thanks for the quick answer. Since I wasn't sure exactly when our service was coming, I just replaced the caps with the nozzles. Now I just need to remember to re-aim them.