forestpct

The heating fan on my 61 plate DS4 1.6 HDi 110 has stopped working. Citroen dealer says it's a £600 job to fix ("new motor and control unit")!! Before I spend this sort of money have Googled problem and there are some suggestions to try replacing the blower fan resistor. Have tracked one down on EBay but can anyone offer advice on how to access the part and replace it? Image of the part is attached if that helps. Many thanks