I wanted to say that discussion is good as it helps develop a working knowledge of how the van works (important when trying to diagnose problems). I just did a search on TVP and found an old thread (similar to this one) from way back in 2008. Here's a link: http://www.toyotavanpeople.com/forum...php?f=2&t=4311 . In my post you will see I'm also calling it the "idle-up / pressure-up temperature switch" ...........I wonder where I got that from? . Tim