Had it done at a local shop, not a dealer, in comination with a flush, oil change, battery check, etc. They have been an extremely reliable shop, not at all like some I hae been reading of here in the posts.. The thermostat itself was $45, quite a shock, really. The temp used to crawl up to 80, but I had no interior heat problems. I think I will research it some more, as it does seem a bit warm in weather around 20 or 30 degrees. I'll be curious to see what happens to yours...