AC VACUUM SWITCH 2571501 AND 2096084 QUESTIONS

AC VACUUM SWITCH 2571501 AND 2096084 QUESTIONS

Thanks guys, we didnt install any of the underhood AC stuff when we bought the car, so the AC function isnt needed/used. BUT unfortunately the vacuum switch is needed to divert air flow. Between old vs new harness and attempting "pin out" I'll see what I can figure out.
OH almost forgot...there was a mid year change in the AC wiring....what a cluster literally. Heres pics of 2 different schematics:BangHead:

Oldmanmopar said
I just ran into the same problem on a 67 Barracuda . I have a 70 and a 71 car here with the newer switch for reference. I will be working on those connections soon. Right now I am installing a map light system and switch so the 67 car has a timed key light, ashtray light,and a map light switch verses coming on with the dome light only. I'll post the findings on those three wires. Also working on installing the rear air on a fastback .

Dana67Dart said
Hi Steve.

You can pinout the new and old switches.

Choose one terminal to be the starting point.

Attach one lead of your multimeter to it and leave it there for now.

Put multimeter in ohms mode

Put the switches in the most off position.

Touch the other lead to each of the other terminals

Note which terminals are open and which have continuity.

Now switch one switch and repeat the process

After all switch positions have been tested you will know which terminals have closed contacts when the switches are in a particular position.

You can do the same for the vacuum part of it. But with a vacume source (probably a low pressure source would do the same.)

If you can, from the wiring diagram of the 67 and the donor year, determin which wire it the main feed that is helpful.

There might be diodes or resisters in the switch so conducting the same test with the leads reversed will show that and also confirm the pinout

Good luck to you

CodyS said
I just put a new switch in my 69 dart and had a similar problem. The replacement switch would turn the a/c clutch on when I pushed the off button. When I purchased the switch it said the switch was for my 69 dart, and I even looked up the number on the internet to make sure it was right. After I had this issue i did some more digging and found one website that said it was for a C Bodie. That was the only place that said that all other claimed it worked for an A Body. It might be the same number you have there I would have to check.