I have a 72 Cutlass Supreme. Unless I am blind, neither the Hi Blower Relay or A/C wiring diagrams are in the main color coded fold out page with all other wires. Why is that? I see the wiring diagrams in the Custom A/C section of the Service Manual though. Thx.

 

Count yourself lucky Olds used full-color fold-out wiring diagrams. Most everybody else used black and white line drawings and crammed them onto a single page.

Wiring diagrams for heat/AC and options such as Rallye Pac and GuideMatic are usually found in their respective CSM sections.

 

The A/C wiring is in the A/C section. The rally pac is ~kinda~ in the fold-out color section, though it is a little cryptic...
Other options are in their sections as mentioned already.

I suppose Olds did this to make the main wiring somewhat easy to follow on the size page it is on. Most cars did not have all the options back then.
My 97 Caddy takes about 100 manual pages just for the wiring...

 

Actually they did that way it because back in the dark ages, A/C was not that common on cars.

 

Yep. I was trying to say earlier that but was not too clear...