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what is that noise?

Hi there,

Our audi 90 developed some weird high pitched noise from the fan
that heats the car. SO when the fan is off, there is no noise,
when you put in in position I,II or III, the noise gets louder and
higher pitched. Also noticed that it happens more in humid weather.

Is there some kind of belt that can be slipping? Something needs to
be lubricated? That fan seems to be working but that noise is just

I am currently waiting for the Bently manual (I should of got it 
by now) so I have to wait for the manual to tell me where that fan 
is and how to get at it.

Thaks for any suggestions.
---....-------------****----*******-) GTI FUN-atic                      o  
--. \/ .-----GTI---******--*********)         Don't forget to bike:     ,-\
--.\/\/.-----------******--*********)  (and sail and windsurf and ski)  0\-0
---....-------------****----*******-) gajewski@ug.cs.dal.ca,goaway@ac.dal.ca