When I test drove the '92 SC400 I bought last week I didn't notice anything unusual. Now I notice the water temp guage swings all over the place, but mostly stays in the top quarter. It hits the red mark alot, but never hits the top white mark (can it hit that mark?). Fluid level is ok and the engine doesn't act hot (no smell or sounds). Is it really overheating, or is it a bad sensor or guage?
Another problem is no interior heat. From other posts this might be common and I'll have to re-read to see if there is the answer in that post.