I am rebuildimng a 69 vette with A/C and the wiring involved has been badly butchered and I am trying to get it all back together again. Unfortunately for me the ability for me to connect color to color is gone due to all the cutting and splicing that has already happened. So, I was hoping there was someone out there that could help me connect the dots and get the blower working again. Btw, I have tested the blower by itself and it does in fact turn so I know it is a functional fan. The biggest mystery right now is the A/C blower relay that mounts on the Evap case. I think if I get that part figured out then the rest might fall into place. Right now the wires coming off it are clipped off so the only thing I can tell is the colors. (which are only be correct if that is the original plug) There is one plug of three wires then a single wire plug, can anyone please help me figure out where they go?

A/C Blower Relay
---------------------------------
Three Wire Plug
---------------
Red
Black
Green

Single Wire Plug
---------------
???? nothing there


Also, one part of the heater resistor also has me confused. The heater resistor is a three wire plug but the yellow wire splits. One half of the yellow wire goes into the firewall to the blower motor switch on the center console, the other half I have no idea.

any help is greatly appreciated!

Shad

 

Can anyone validate that the red wire on that three way plug on the A/C blower relay (which is usually located on the evap case cover) comes from the horn relay on the other side? I have the Chiltons manual, the GM assembly guide, and an EZwire thing I ordered online and none of them have this little relay wiring. I have gone through hundreds of Ebay pics trying to get a glimpse of this relay just so I can get this wiring hooked up. The GM assembly manual shows the parts being installed in their appropriate locations but does nothing to help me as far as the wire colors or where they originate from. As always, any info will be of great help. After 7 years of frame off rebuilding I am getting into the home stretch. I had all my dash and center console put together and had to tear it all back apart to try and figure out this heater and A/C wiring. Gotta love them project cars!

thanks,
Shad

 

Shad
See my response in the C3 Tech section.
Don