Greg,at the lower most foward section of vent assembly you will see two screws. Also at the uppermost section in the door glass channel is one smaller screw that holds foward section to glass channel as well as channel guide strip. Remove these three screws and you can disengage upper pin and then rotate vent window frame so the staked portion aligns with notch and lift out. Hope I didnt make this confusing , it's not.
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Leo
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