ford use dye in factory fitted A/C. most dealers put dye in the system.
gas and oil  can come premixed with dye. automated A/C service stations add dye to each recharge.
Code of conduct for A/C repairs demands that gas not be put in a system that contains leaks so there is no leaks to test for.Dye is bigger than gas particals so the leak has to be big to leak out.
3 dye will return to be a powdered pigment-so over the systems  life you may as well fill it up with talc.
the other idea is to fill the system with moose incase it leaks.When it does you have to buy a complete system anyway.
				
			
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