71 GP AC Blower Motor Relay Location
 

My AC fan is not working on high so I suspect that the relay is bad. On my 67 GTO it was right there on the firewall. On my grand prix I don't see it. Any clue where it is on this car?

The high speed has its own fused harness direct from the alternator, check the fuse inside holder there first. If not that, the harness may also have a break in it.

High blower relay is on the firewall - if it's still there.
 

Here's a pic showing where the high blower relay on air conditioned Grand Prixs was located.

The inline fuse holder is at the alternator. It attaches to the big stud on the back of the alternator, alongside the main wire to the battery. Unfortunately, I don't have a picture of that.

Good luck!

Here's some photos of the fuse holder and harness at the alternator...