I have an Aluminum 3-cor rad with a thermostat controlled adjustable Black Magic pull fan and she runs real cool, also try Redline Water Wetter, good stuff and will help reduce temps. Its also possible that you have a lot of build-up of sludge and could use a flush. A lot of folks don't recommend flushes because it can create leaks but if your thinking of a new rad, then I would definitely consider it.thamende said:I have a carbed 89 hatchback and when it runs at idle the tempurature gets up to around 200F. its a basically stock motor besides the carb conversion. im currently using a thermosat and the stock 5.0 rad. Should i upgrade it to a 2 or 3 core rad?