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This is what Cressa is referring to: The definitive VR6 cooling guide - Engine Bay - The Corrado Forum. Most of it carries over to the 4-pot cars (radiator switch, fan controller and sensors) - just ignore the auxiliary electric pump. The blue sensor tells the ECU the temperature. If you can get to it, disconnect the housing and measure the resistance of the sensor with a meter. Cold values are larger resistances (250 Ohms) and warmer values approach zero Ohms. (If I remember it correctly!) Or if you have VCDS or such like - see what temperature the ECU believes it is. Looking further the 16v seems to have both sensors in one 4-pin sensor..

Apologies that I can't really help with having the 16v, but. Have you looked in the WIKI at cooling, as i recall that mentions the sensors. I think the best investment with any corrado is the Bentley manual. Some people have a pdf version floating around