Well, you all forgot the step in the citric acid flush instructiosn for REALLY stupid people lik myself.
And the step is....mix citric acid powder with water thoroughly BEFORE putting in reservoire and filling collant system....otherwise, someone with no sense like myself might actually pour the 2.2 lbs. of powder directly into the reservoire with a funnel a little bit at a time with water to flush it in each time...making sure that clumps of citric acid are floating around in your coolant system, not mixing proberly and making all kinds of air locks.
Good God, this is a pain in the butt sometimes.
To make this even more fun, the hose clamp connecting the hose to my thermostat housing was loose and came off when I reached a destination today, spraying nice sticky citric acid (and a few clumps) all over my engine compartment...
Oh, yeah. It's been a FUN day
Pete.