IS YOUR HEATER BLOWER MOTOR NOT WORKING AT THE LOWER SPEEDS???
The fault is probably (not definitely) this control unit - not the switch
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NEW
Heater Motor Blower Control Unit
Note - Alternatives exist within the quoted vehicle ranges
Please compare your original to the image below
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Citroen C3
2009 to 2016
Citroen Xsara Picasso
1999 to 2007
Round style housing with 5 inline connection pins