I am a little confused as to the use of the fleetguard test strips. I have the sample from my radiator, but the colors of the sample show that the first (end of the strip) near the A B colors and the other two pads were almost clear. Does this mean I'm ok or is the sca level ok. Coolant came out a really dirty green and I think its time to do a change. We have had 110F plus days here in phoenix for at least two weeks now and a good cooling system is a must. Any help would be appreciated.