Dumb belt question

[chalet2506]

76K5 blazer with an a/c and no smog. I took the belts off this a long time ago and can't find them all, don't even remember if it had 2 or 3.

Napa's telling me I should have

1. - Crank / Alternator / Fan - I've got this one.
2 - Crank / PS / Fan
3 - A/C Crank

But, the fan only has one groove, and the way the grooves in the ps/ac / crank are I can either run

1. - PS / a/c / Crank - which leaves one groove unused on the crank

or.

2. Crank / PS and then a seperate belt to run from the PS to A/C.

Not sure here, but I think option 1 makes sense, even though I don't think its the original routing.

 

[4X4HIGH]

Most vehicles of that vintage ran 1 belt for crank, alternator, water pump then another belt from crank to P/S. If the vehicle had A/C then the second belt usually was crank, A/C, P/S.

 

[chalet2506]

Thanks, I thought that made the most sense.