Ford did come up with just such a procedure to maintain the A/C system on their vehicles, about ten years ago. The solvent that was originally used in this type of application was Freon TF solvent. Liquid oxygen facilities formerly used this often to assure the removal of all petroleum products in aircraft or whatever, because of the explosive potential. Ford reintroduced this because they have a truck that has 3 expansion valves and thus often there is not enough force in the system to push debris out to the filter dryer. They also recommended it for all their vehicles for whatever reason. It does work but it is expensive as I recall. It is most likely the dryer desiccant that is spread through this A/C system now, the color would indicate this is the contaminant. There are also some other cleaning systems available for this purpose, I have seen air brake alcohol recommended for this purpose, it evaporates and it is very inexpensive. It sounds to me like your mechanic knows what he is talking about. hope this helps reassure you; Jeff/ Florida
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