hi not sure if you got the rad out yet, but if you have a hose handy try filling it from one end and see if the water comes out as fast as your putting it in, if it backfills quite quickly you know theres a blockage. if the rads been sitting for a while the sludge might have hardend and blocked areas, a good flush as mensioned on previous posts should sort it
standard rad and fans on mine.. they work perfect together.