Thanks everyone. Your responses are basically what I've been thinking. We've successfully done the multi-month experiment not using it. I do feel expensive repairs are not too far away.
I appreciate the suggestion to sell both cars and replace, but between multiple kids, car pools, field trips, skiing and camping, the minivan is great for those times. We generally don't drive it more than two or three days a week, so we are really not a high car use family, but when we are there is either a lot of stuff or people.
We are still in negotiations, but hopefully I'll be able to follow up with a sold update soon!