Well if radiators were made like they use to be I could have the in-tank cooler added. These plastic tank aluminum core things are not something that you can modify. What if I have some sort of fan on the cooler? I see your point about the times when there is little or no air flow going through the radiator. How much cooling does the main engine fan provide at low speeds? With three layers of heat exchangers and low RPM I expect it is not much. I guess if I could find a used radiator with the tank that would be an option but finding one that is not corroded may be a problem. I will have to get a Scanguage II and monitor temps that way. If the transmission is in neutral with the engine running will it tend to cool off or should shut the engine down to give it a rest?

Perry