Hi everyone. Hope it's ok to post this question here. I have a '64 Impala with factory air. To make this work properly, I need what I'll call a vacuum switch. As explained to me by my mechanic, this switch as 2 vacuum lines going to it. One is for heat the other is for A/C. There is a plunger in this switch that will go to whatever side the vacuum pulls it to; whatever you want, heat or A/C. The plunger sticks and I would like to get a new one. I can post a pic if that would help but wouldn't be able to do this until next week. Does anyone know who might sell vintage A/C parts that I could contact?? Thank you, Carmine.