Hi Mark
Sorry, I can't help you with what's wrong with the heater in your Cat. But, I recently saw a Youtube video that somewhat explained how and why the heater controls work on a 1966 Catalina. Very similar to your 67
Look up on Youtube,
Rare Classic Cars ... The perfect family car.. 1966 Pontiac Catalina
Go to 3:07 on the video and listen to the explanation.
Again, sorry I couldn't post the link. I have no clue how to do that. Maybe this will help?
Good luck my friend
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