I found the answer in the Volvo technical docs. The fan does not turn at 7% duty cycle. It doesn't mention what happens at 15% but I assume the fan is working correctly.

And with zero help on this and every post I've made since my engine blew over 2.5 years ago, I am out of here and sticking to Swedespeed for my answers. Apparently this site is only for folks who want to trick out their Volvos. Fair enough, but wish I had known that going in. And Matthew....did I pr...