Yea, we had one on Dad's truck. It's called a Failsafe, and it failed closed. Go figure. BTW< that's an 88 Ranger 4X4. Tony On Mon, Dec 13, 2010 at 11:20 AM, Kneale Brownson <kneale at coslink.net>wrote: > There IS a thermostat designed to fail OPEN so at least you're not > threatened with overheating.