May I ask you if your Safrane is equipped with electronic climate control with nice backlit orange display and also if the blower runs at full blast or just some partial load? I think the problem might be inside that nice controller-bastard or in external relay. Trace the wire from blower and see where it goes to relay or that module. Relay might just stuck 'cause of weld-up contacts. In that case a good dent on it will cure the problem. Be careful though, don't overdo
