Correct me if i'm wrong, but isn't the whole point of the turbo timer to keep your engine running is to enable the oil pump and water pump to circulate the hot oil and coolant? This in turn brings the engine and oil temp down to normal level without needing the keys in the ignition. IMO, just turning on the aircond fan on the radiator won't do much to prolong your engine parts' life. Well, maybe just the radiator. But your battery may not last long too.