That is indeed the rear window defog switch.
What is this switch for?
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Joined: May 2017
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From: VA
What is this switch for?
Ok... this may be an incredibly stupid noob question, but I have no idea what this switch is for. It is on the console, above the gear shift, and to the left of the AC/Heater control. Is it factory or something some previous owner added?
Melting Slicks
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Back in the day (I owned a 1979 from 1986 to 2003) those shift console plates did not come with holes pre-cut for that switch and power window switches. You had to do that job yourself. It took a little time to do a nice job.
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Joined: May 2017
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From: VA
There are no lines in the glass, perhaps the glass was replaced with non-defrost glass by a previous owner? Needless to say, when I push the switch, nothing appears to happen, lol! I agree with others that hole for the switch looks to be "homemade".
Le Mans Master
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From: Glen Allen, VA
I too have thought of possible uses for the factory defrost switch on my 79. Maybe an override for the factory electric fan is something I'm thinking of. (My rear window defrost doesn't work either, and I really don't have any use for it anyway, since the car lives in the garage.
Team Owner
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Now that you mention it, I agree! I seem to recall opening up those holes, in a replacement console plate, but I don't remember who I did it for.......