With the engine hot and at idle I can stop the fan with my hand, and when I run up the rpm's (3000) i can still hold the fan without feeling it trying to turn. Is this normal or a bad fan clutch. Also this is a new clutch (sachs) and there is thumping sound coming from the clutch that goes away in about 4 or 5 turns of the fan when I first start the engine. All the bolts are tight and the fan is seated on the pully. Any thoughts.