hi
had thesame issue with my xantia, my electrician new exactly what the fault was, the wiring loom connects via a block in the driverside foot well under the carpet right against the door, he moved the carpet to show me and the connections were burt, apparently they get damp and short out causing both fan issues and rear window problems, he replaced the connector and checked the wires for £25.00. never had a problem since, fan works great on all settings.
common fault he said. so maybe worth a look
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