Citroen C3 - blower works regardless of ignition

[Craigie]

As title suggests, when you switch the ignition off the heating and ventilation blower continues to go, resulting in a flat battery if not noticed.
Blower works in all positions so does not appear to be the known issue of resisitors failing.
When I pull the 40A fuse under the bonnet for the blower it kills it.

I am thinking there must be a relay somewhere for the blower only which is jamming but I can't seem to find mention of one. All the other things like radio , wipers etc switch off with the ignition so it is obviously something unique to the power to the blower.

Any thoughts?

[Craigie]

Thanks for that information - father in law has actually been ill after an eye operation and unable to drive so we still haven't got round to fixing the problem.
Will have a look at this - do you know off hand where the actual blower is, what we need to dismantle to get to it etc?

Many thanks