Wkerfoot, yes, the pump is running.
BigAl, my DH doesn't think we have a valve on the pump, at least he hasn't seen one. He is going to check the in-line strainer.
Also, in my haste to try to resolve this problem, I posted this question without doing a search first -- my bad. Immediately after posting, I searched and found a similar post from someone about a week or so ago.
I'd like to apologize for the duplication.
We found some things we can try from that other post too.
One new thing though, my DH would like to know if anyone knows if the 1999's have a "crossover" valve like the '71 Safaris have?
Thanks so much for everyone's help.