Excerpt
… Johnson’s mechanic had discovered a technical service bulletin from Ford issued in 2009. TSB 09-21-6 said the flakes could come from part of the vehicles’ evaporator cores. The bulletin warned it may cause eye and respiratory tract irritation and could lead to harm to the respiratory system or bone damage as the result of fluorosis.
One of the things that can cause fluorosis, or brittle bones, is too much fluoride in the water. In this case, the fluoride is part of aluminum potassium fluoride, used as a binding agent in the cores.
The bulletin lists car models back to 2000 as potentially having the problem. But a number of complaints have surfaced recently, and it’s not just a new-car glitch. Johnson’s cars both turned over at least 30,000 miles before the problem turned up…