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Yup. As I understand it, the windshield defroster button controls vents in the air conditioning system, that shunt dehumidified air to the windshield, to aid in defrosting. The rear window defogger button controls things that are electrical: the imbedded rear window defogger, heating the windshield area underneath the wipers, and the outside mirror defoggers.
Best.
Byll
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