[me and my metro]

I had a Ford Escort years ago that would only overheat on the highway, it was perfect around town. It had a restricted flow radiator, new radiator solved the problem. It is possible that the three row radiator could be flowing too much water and not removing enough heat. In a stock car we set temp by changing to size of the restrictor we used in place of the thermostat. We ended up with a 5/8" hole to keep the temp where we liked it in Bakersfield. The 11/16" hole ran hotter due to the water moving too fast through the system.