Be sure to check out this detailed Vintage Thunderbird Repair video about how to repair the heat and air vacuum control valve.
https://www.youtube.com/watch?v=n-KKaK67s6E
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https://www.youtube.com/watch?v=qAhofA_sIDU
Will we ever get all the lights working on this car? Only the flashers are left to repair. Easier said than done.
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https://www.youtube.com/watch?v=w6PHEswospo