heater blower not working - blower resistor location diagrams

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My Name: Arfur Dent

Posts: 3520
Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
Engine name: DV4 16-valve diesel (90 PS)
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dandanfireman wrote: Fri Mar 13, 2020 12:03 pm Hiya guys newbie here, to c3's not to car repair, was on the old 306net website before. I have the old motor blower failure going on. Happened on a very cold morning in January and just failed full stop worked again for a short time on one day then stopped for good.

Resistor pack, replaced and didn't work so went back to original.
40amp fuse in fuse box in engine bay f18 i think, changed as was getting rusted up.
Pulled out the multiplug from the rear of the control panel and the large black wire is melted on the outside face where it connects to the control panel.
I have back probed the pins b4 and b6 red and yellow respectively and with ignition on and fan on 2 there is no voltage registering on the multimeter at all.

I'm unsure as to whether the multiplug will be damaged or the control panel is damaged, only inspection with a mirror and torch i cannot see any burn marks on the rear of the control panel itself. I am aware that as i have the 1.4 hdi 16v there is a maxi fuse section and a further supply for the auxilary heater unit (fuses held under normal fuse tray and relays under the battery tray) however i'm leaving this for a day when i have far more patience as the fuse tray was stuck to the power nut and didn't want to come out.

Any help would be appreciated as i have no idea about the auxilary heater unit. Have thrown the + terminal of a 3.7v battery into the output wire B4 to see if it spins up the blower motor and that returned no result nothing to be heard at all from the motor.


The blower control lines are different for petrol and diesel. You may have tested the wrong wires?

The diagrams in the C3 Haynes Manual (here) covers both the petrol and diesel wiring for the blower and shows the difference.
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My Name: dandanfireman

Posts: 2
Joined: Wed Mar 04, 2020 12:57 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 167000
Trim Level: XTR
Gearbox: Manual 5 speed
Engine name: ET3 16-valve (90 PS)


Ah i hadn't thought of that. Any idea what the diesel input and output wires are for the hdi's?

After finding the wire A9 had melted the end of the multiplug slightly i decided to remove the heater blower control panel to see if anything inside had shorted out. Inside was a pcb with no signs of damage or melting at all. A large 50 micro fahrad capacitor whose top had not blown so still intact i can only assume. No loose connections so i have put it all back together and assume this is fine.
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