vincer77

Last couple of times I've driven my '97 Cab, I hear what sounds like the ventilation fan running at low speed. The controls are off. According to Streater the off switch is only a low setting (2V). Wonder why I never noticed this before.

Is this what happens in your car?

ble2011

Check the DIY section under "How to remove whirring sound from 993 dash".

2Many Cars

I've never noticed on my car but I know some manufacturers do that so there is always some air moving through the HVAC system. I believe the theory is to avoid potential mold growth from any moisture from accumulating in infrequently used systems.

ToreB

The fans should shut completely off when the fan control **** is at minimum setting. I am therefore pretty sure you hear the CCU fan. It stays on for some time after ignition off and can make a whirring noise and it can be a bit irritating. Easy to change though.
www.ccu.tore.bergvill.com
Cheers,
Tore

vincer77

The sound I hear is when they ignition is on - not off.