amfp

With ignition off and controls off... anyone hear a soft humming sound from the ac/heating controls? Kind of like hearing an old fluorescent starter/light sound in a quiet enviornment.

If yes, did you correct it?

TheBen

I think the controls have a small fan.

Bill Verburg

there's a small fan on the CCU, it's normal for it to run for a few minutes after the car is shut down

kjr914

You might also hear your clock running.

amfp

Fair point, thx, but is coming more from climate control area, after verifying with a stethoscope. Just checked an hour after my post and the noise is no longer there. Odd as don't ever recall hearing the noise before. Will keep monitoring. It is not a short, as the trickle charger shows battery is fully charged.

NC TRACKRAT

I seem to recall a fix was posted for that a few months ago. Something about dust accumulation that makes the little fan noisy. As I recall, careful cleaning cured it. Anyone remember the thread?

96PCarrera993mg

Here's what I found on CCU fan whine or unpleasant sound in dashboard:

Some might think they have a very noisy clock in the dashboard, but this is often a failing CCU fan. The fan needle bearings wear out, and the fan may be very dirty. You could try to clean the fan rotor, but be prepared to change it, a repair may not last very long. See the details page for more on this.


This is the CCU fan:
Front:
Rear:




Clean or replace fan:



Credits:Tore.Bergvill.com

bcameron59

See here:

https://rennlist.com/forums/993-1995...-993-dash.html

credit: geolab

Lorenfb

"there's a small fan on the CCU, it's normal for it to run for a few minutes after the car is shut down"

And not any longer, or the CCU wil eventually drain the battery.

amfp

Many thanks guys for taking the time to explain options / fix. Much appreciated.