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I appreciate the helpful references above. After reviewing them, it appears that the control unit in my 72 is from the 73+ year model and that likely explains the way it was jury-rigged. I have obtained another control switch with all of the plastic vacuum nipples intact and I'm going to swap...

Thanks for the referrals. I’ll check those sites out. Unfortunately there is no fender tag on the car. We only have the VIN and I haven’t come across any broadcast/build sheet that I often see people find behind their rear seats or somehow in the dash. Hopefully between the sites you...

Wow - thanks - that's interesting that that switch was only used on 73-76's... Appreciate the update. Perhaps the person in CO where this car originated from had swapped out the original heater control unit for a 73-76 model as you've indicated. The unit fits in dash fine and the fan works -...

I have only started working on the car and pulled this out without too much trouble but what makes you think the heater control unit isn’t the right one?

Did you happen to see the post on the Heater Control Unit for the Chassis Service Manual? The manual helps spell out what each of the vacuum ports are used for. Good luck.

Thanks Cruize 418. I have secured a control unit through eBay and will give it a try.

Thank you 67Dart273 for the call out and recommendation. The chassis manual is an incredibly useful tool. On page 24-64 there is a diagram that shows the vacuum ports in a configuration that reflects what the 3502414 control switch looks like and according to that picture it appears that...

Hello, I'm new to the A body world as my dad just gave back a car my brother and I got him for father's day 8 years ago as he can no longer work on it. I am trying to get the defrost working in the car. I pulled the heater control unit out (that wasn't easy but it made it through the radio...

Pat, are you by chance heading to the fox lake show tomorrow?