[s-cars] Re: heater fan a thon

[Lee Levitt]

Bill writes:
>
> Are you sure it's the heater fan? Does the noise vary with the fan
> speed. Reason I ask, is that the miniature fan that draws cabin air in
> for climate control purposes sometimes makes noise on my 94 S4. Fan
> pulls air though the tiny dash vent to measure the temp. Happens very
> rarely and hasn't happened in a long time, but, first time I heard it, I
> thought the heater fan was going. Varying the fan speed had no effect on
> the noise, but turning things off completely stopped the sound. Might
> check this out prior to major surgery.

Nope, I'm not sure. The sound does not vary with fan speed.

Should I just assume that it's the primary fan and go ahead, or is there a
way to diagnose which fan it is?

Thanks,

Lee
'95.5 S6 avant
'96 A6 quattro avant