You have dry fan bearings and the dash must be removed to fix. I recently did this on a Vanagon with 146,000 miles on it.I freed up the frozen fan lubing both bearings.
Robert
1982 Westfalia

--- On Mon, 4/8/13, Stuart MacMillan <stuartmacm@GMAIL.COM> wrote:

> From: Stuart MacMillan <stuartmacm@GMAIL.COM>
> Subject: Heater fan CHIRP!
> To: vanagon@GERRY.VANAGON.COM
> Date: Monday, April 8, 2013, 10:52 AM
> It's so loud and high pitched that
> it's painful to use the blower, even with
> my reduced hearing.� But, as I continue to, it's
> becoming less frequent.� Do
> these things ever fix themselves?� It's probably�
> dry bearing or worn
> commutator/brushes, but with only 140k on it (an '85) it
> doesn't seem like
> it should be worn out since my '84 worked fine for 20 years
> and 225k.
> 
> 
> 
> I'm tempted to shoot some WD-40 into the intake, but I'd
> probably regret it.
> 
> 
> 
> 
> Stuart
>