heater blower not working - blower resistor location diagrams

Hi Chrisdude

Chrisdude wrote:But also only half the heater control panel lights up which I have attached.

Chrisdude wrote:Have I possibly missed a fuse? Would there be a fuse in the glovebox that could cause this?

I would say its more like the melted control panel in the pictures above (and below) rather than a fuse that lights only half the display.

It could be that you have half the lamps blown, but it would be worth removing the control panel and inspecting it and its wiring for melting or burning.




Melted control panel for the C3 heater can give problems



Melted and burned plug on heater control

Cheers mate, I'll check it tomorrow and post results

Ok, this is getting horrible as, well, its getting cold.
I have now replaced the main control panel, replaced the Resistor and still the same. Interestingly though when the car is not running but turned on the aircon light comes on. As soon as I start turning the blower control the light dulls then goes off.
I have heard on youtube that fuse F18 can go corrosive rather than actually blown. This is my next port of call. My dreaded question is, is my last option the motor itself? If so is it fairly easy to remove?
I just hope I have not missed any other fuses that could possibly cause this

Chrisdude wrote:I have heard on youtube that fuse F18 can go corrosive rather than actually blown. This is my next port of call. My dreaded question is, is my last option the motor itself? If so is it fairly easy to remove?
I just hope I have not missed any other fuses that could possibly cause this

The motor is tucked well behind the dash, I have not had a motor out, but it does look difficult to get to

F8, F1 are used in the engine bay fuse box for parts of the control panel on a petrol. There is no mention of any BSI - cabin fuses being used.

Hi chrisdude and all,

Did you ever find an answer for this? I have exactly the same problem on a C3 old model 2009 (59) with standard air con. The control panel lights are half lid and the other half occasionally. Also, the heater blow was intermittent and has now stopped working completely. I have changed the heater resistor pack and checked that each wire to the pack gets a full 12volts in turn when the fan switch is on the relevant speed, checked the fuse box and fuses under the bonnet. Everything is fine. I cannot locate the blower motor to test it (not sure how easy it is to get to or where to get to it?). Reading this thread, I am now back to thinking the heater control panel is cuasing this, but as the fan speed switch is changing the voltage of the wires at the resistor pack - I made be wrong. Any advice would be useful please.

Thanks,

Steve.

YES I DID mate, and to be honest it's really embarresing.
I changed everything, including the controller. The answer was ridiculous but not obvious. The fuse. It looks unbroken right? And is a BIG fuse, mine was unbroken in the center. After a week of freezing I checked the fuse again, then I noticed something, one leg under the plastic was a milky colour. I did not notice it before as I held it by the leg so it was covered.
I checked a Citroen video from a mechanic on youtube and it turns out these fuses are prone to go corrosive. It's called Galvanic Corrosion.
I changed the fuse, everthing fired up. Needless to say I was slightly upset after spending 40 quid to find 75p would have fixed it.
So. A note to all people who see this page.
If the fuse looks ok CHANGE IT ANYWAY!

Chrisdude wrote:If the fuse looks ok CHANGE IT ANYWAY!

Yes, if you can't meter it, just change it.

Chrisdude wrote:YES I DID mate, and to be honest it's really embarresing.
I changed everything, including the controller. The answer was ridiculous but not obvious. The fuse.

thanks for the update

afternnon all

Just seeing if someone could help me with the same issue as the op i have an 55 plate 1.4 hdi which has the digital ac unit, i have have checked the fuse in the engine bay which is ok, im guessing my next port of call would be the resistor pack, if someone could point me in the direction of which one i needed

many thanks in advance

donskoops wrote:afternnon all

Just seeing if someone could help me with the same issue as the op i have an 55 plate 1.4 hdi which has the digital ac unit, i have have checked the fuse in the engine bay which is ok, im guessing my next port of call would be the resistor pack, if someone could point me in the direction of which one i needed

many thanks in advance

Pull your out and have a look here to match yours.

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.

Checked:
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.

Thanks

Dan