$1500? 
you're actually high. 
the clutch costs about $370. the labor calls for about 3 hours, and that's what i quoted the guy. we can thank an over-zealous engineer for that one. viscous(think i spelled it right) clutches have worked perfectly on automobiles since the 60's. especially when coupled with a fan shroud. 
 with those, the clutch cost about $50 max, and generally an hour or less to replace. 
 so thanks to over-zealous engineering, we have a fan clutch replacement at approx. $600, whereas had they left it the hell alone(because it wasn't broken) it would cost well under $200. 
 i can't wait till i get my video cameras hooked up in the shop. you should've seen the guys face when i told him. 
here's a comparison. 
the fan clutch my customer needs.....

a normal fan clutch...of the design used since about 1965. rarely failed. 
