Cooling Componets fan vibration

Just installed a new Cooling Componets electric slimline fan on my Merc,and noticed a lot of vibration.Has anyone had a problem with these fans

 

i have run 2 or 3 of them, no problem. does it have enuff screws? mounted solid? give tech a call, could be fan not balanced.

 

yep, and i spent big bucks on it. Mine was one of the first that Walker rad. put out (think he founded it). It never worked for me, vibes, not enough air flow, and the cust svc. guy told me i needed to cut two holes in the bottom of it for circulation (?????????). Later they came out with two rubber flaps on the bottom. Bad money not spent well.
A good shroud and mechanical hi pitch fan set up right will work every time.
cooger

 

Thanks