If I understand your question, I think you are referring to the vacuum diaphragm that actuates the recirculating air feature on the A/C.
Lyle
On Sunday, May 12, 2019 at 7:47:22 PM UTC-4, Bob G wrote:
Hi all. I'm finally getting around to working on my 63 Belevedere. Problem i'm haviving now is that i can't remermber if there is a spacer between the steering column and the dash. Hope someone can Help. Thanks