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If you don't get anything on 4 I wouldn't think the resistor is at fault, maybe the fan blower motor itself.
The resistor puts less power through the blower hence the slower speed, setting 4 is no resistance and full speed ahead.
Currently in MrMartyn1984's garage:
1999 Laguna 1.6rt Sport & 2006 Laguna 1.9 Dci 130 Dynamique