Noisy fan in dash.

[Kneale Brownson]

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The "dash fan" in Type 44 Audis (5K, 100, 200, V8) is an aspiration
(sucking) fan to pull air past one of two cabin air temperature sensors
used by the climate control system to keep you comfy.  I managed to quiet
down a squealing aspirator fan by spraying some lubricant through the
grille in the dash, using one of those long delivery tubes.  For details on
replacement, see Scott Mockry's resourceful
website:  http://www.sjmautotechnik.com/AC.html#aspir


At 11:01 PM 12/13/2001 -0800, George Harris wrote:

>I have a niggling little problem and wonder of there is an easy
>solution. It sounds like there is a fan in the dash that comes on before
>the regular heat distribution fans. Seems to be independent. Maybe just
>for defrost?
>
>Anyway it recently started to be noisy. First is started to rattle when
>I put on the brakes. Then it started to rattle in time with the turn
>indicator. I have 2 possible theories. The battery is low, and my
>charger is weak, so that any time I have extra drain on the power, ie
>when the brake lights are on or the turn indicators are on, the fan
>slows and rattles. 2nd theory is that there are poor connections
>somewhere in the circuits and when the these lights are on, the current
>is somehow increased and the fan turns on.
>
>Anybody had this problem before?
>
>Cheers
>George
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