I have an '82 245 with the two piece fan clutch and blade. I had recently suspected that the clutch was not operating (temperature gauge reading slightly higher than normal) so I ran the car up to operating temperatures then stopped the engine and quickly moved to the fan to see if the clutch had actually locked up. No, the fan still freewheeled with a slight amount of drag. The Volvo specialist in the area suggested that the fan clutch was the culprit and offered me a 'good used' unit that I promptly installed... to find no change. No change in temperature readings, no change in the aforementioned test. Does the engine have to get beyond normal range for the clutch to engage? I am thinking now that the radiator has a partial core blockage on the inside or the thermostat is restricting flow. Driving on the highway with the heater on low keeps the temperature gauge dipped below half which is normal for my car. Any thoughts on this popular topic? Thanks.