I had a '98 Ford Ranger (4 cyl) that had the thermostat stuck open. It was fine in the warm weather, but would take at least 10 minutes to warm up in cold weather - that being in the 30s F at night where I live (Burr!!! <img src="/forums/images/graemlins/lol.gif" alt="" />). I imagine it would have acted similar to your Sporties had it been operated in single-digit or lower temps. That said, I was just too lazy to fix it because I would eventually get enough heat in the cab to forget about buying the part... until I started it the next morning. It was like groundhog's day all winter long!!! <img src="/forums/images/graemlins/notooth.gif" alt="" />