Whenever I see that, I always freeze the dash shot.

3 rockers on the left.

Can we name what all three were for in a sedan ?

Defrost, rear antenna and ???

Canadian Poncho wrote:

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The third could be that optional fan in the kick panels.

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 or reverb.

Canadian Poncho wrote:

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Was reverb available in '69?

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 yes reverb's last year was 1969.   I too would have guessed Defog / Defrost (they're 2 different rocker switches), Air (kick panel air), Antenna or Reverb.