Ac wire question
 

I have a 71 Chevy and the air compressor won’t engage however I did notice that there is a plug under the dash(2green wires and 1 yellow) it’s a 2 post plug and I can’t find where it plugs in .. any help will be appreciated.. thanks

Re: Ac wire question
 

If I'm not mistaken it should plug into the switch near the center vent? (if that makes sense)

Re: Ac wire question
 

Sounds like the 2-prong plug that goes to the A/C compressor switch. Kinda hard to find but it's located behind the heater box under the dash, slightly to the right of the cig. lighter. This is what you're looking for:

https://www.classicparts.com/images/68-961-th.jpg

The switch mounts with the connector prongs down, and the button activator on top. The button is operated by the A/C and Heater outlet slider at the center of the HVAC control.

Re: Ac wire question
 

Yes that’s it....mine is missing but at least I know what I need now.. thank you

Re: Ac wire question
 

Glad I could help. Last year we did a lot of A/C work on my K20 and had several issues. Installed virtually all new parts but compressor would not come on because that switch was faulty. Had a bear of a time finding it and replacing it.
Good luck with yours.

Re: Ac wire question
 

I do have another question.. the pass floor vent opens with vacuum but doesn’t close .. is there supposed to be a spring on the door to close it??? Thanks Jim

Re: Ac wire question
 

Yes, there's a spring from the vacuum actuator to a tab on the vent door.

Re: Ac wire question
 

Thanks again.. Jim