Thanks to Andrew for finding the link:

Karl's fix.

http://www.thesamba.com/vw/forum/viewtopic.php?t=386923&highlight=heater+fan

________________________________
From: ron johnson <rcj.yes@GMAIL.COM>
To: vanagon@GERRY.VANAGON.COM
Sent: Mon, January 25, 2010 2:39:23 PM
Subject: heater fan whine

Quick question - both the front and rear heater blowers whine after 5-10 minutes operation. How difficult is it to lubricate these poor animals?

thanks,
Ron J.
PDX, OR
'91 Weekender, AT