You are correct - I saw the 6 bladed fan on a vendor site. Perhaps it is quieter? I also have noticed on the generic auto parts sites fans from china advertised for under $100  buy I would not trust them.

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-----Original Message-----
From: David Beierl
To: rubatoguy
Cc: vanagon
Sent: 2011-05-10 19:01:22 +0000
Subject: Re: Radiator fan

At 01:55 PM 5/10/2011, Todd Last wrote:
>I notice the 450w fan has only 3blades, while the non-a/c radiator
>fan has 6blades . Is there any benigit in running one fan over the
>other?  Eg: put the 6blade fan on the with a/c fan or the 3 blade
>fan on the non a/c model

My strong suggestion is to use the fan with the motor it was designed
for, unless someone out there has real hard knowledge about the
differences and tradeoffs.  That being said, my '84 had a
three-bladed fan, my '89 has a three-bladed fan and frankly I doubt
that the six-bladed fan is original.

ETKA gives two p/n, 811 959 465 A and 251 959 465 B but both point to
three-blade drawings and I can't tell whether they're interchangeable
or whether one is for the 300/200 W motor and the other for the 450 W.

Yrs,
d