I have a friend with a 1967 Chevelle that has a mild 396 big block in it. It has a champion aluminum radiator in it with two electric fans on it. I have checked to make sure the fans are turning the right way. While the car is going down the road it is wanting to heat up. He usually stops it when it gets in the 215 area. If he stops the car and lets it idle it will cool back down. It has a Vintage air front runner system on it with I'm sure a stewart water pump. The water pump seems to be circulating the water in the radiator fine. I would think the car should be getting plenty enough air going down the road to cool it. It has two gauges on it. A Dakota Digital and a Sniper coolant temp sensor. Both gauges are reading pretty close so I don't think it a gauge issue. My friend has tried several thermostats and flushed the radiator out using several different brands of radiator flush. I've been around cars all my life and what I'm seeing simply doesn't make sense. Most of the time if a car is heating up going down the road it is a air flow issue. On my 1965 Nova I can take the relay's out of my fans and it won't heat up driving at highway speeds. I've actually seen him drive up with the car running close to 220 and let it idle in my driveway until it cools enough to start cycling the fans off and on. At this point I'm thinking it must be a radiator or water pump issue but just looking at them they seem to be fine. It isn't losing water to make me think it's a engine problem and I set the timing myself so I know it's right. Anybody want to venture a guess. Mike Goble?