Mark,
I also wanted to thank you for the historical info on the production numbers for the ATC, I always wondered about that. I assumed it was low, but after having fixed a bunch of these it seems that they are everywhere ;-) Even at 2% of the 1969 GP production that's over 2000 ATC's. I was not aware of the “Pontiac Automatic Temperature Control – 1965-1966 – Servicing and Repairing, Model with Auto Temp” manual you noted...I'll have to see if I can find that.
I'm not surprised that the Caddy dealer gave up and billed your dealership anyway for the 75 GP ATC. If you have an ATC car its hard to not fix it because it controls everything for the ventilation system. And, depending on what position it decides to stop working the heat could be on wide open or some other random setting that you may not want at any point in time. I see people just disconect the arm and push the door one way or the other, but you still have no control over the vents or the fan.
If you are inclined get a hold of me and we can check the ATC out... I know what you mean about the vacuum lines, there are a lot of them, luckily they are usually ok, the double sided pods are what usually give out, the singles are fine since they don't have the rolling grommet that gives out.
Enjoy your Bonneville Brougham.
Attached is a pic of my 69 GP with ATC.
Thanks, Paul
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