Heater blower failure

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My Name: bill sutton

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Oh! how I'm loving the gradual disintegration of my C3, it would be hilarious, if it were someone elses!!!!

Heater has stopped blowing. The LCD on the dash works as normal and says that the fan is blowing, but it isn't. However, the temperature regulation still works with the slight ambient air flow when moving.

The 40 amp fuse F18 in the engine fuse box is intact.

Any Ideas without stripping the motor out for testing?
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My Name: C3driver52

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Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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Oh! how I'm loving the gradual disintegration of my C3, it would be hilarious, if it were someone elses!!!!
You seem to be having nothing but trouble with yours bill!

There is a motor controller / motor resistor that is much easier to get to than the motor, well worth a poke with a multimeter after you extract it.

Citroen C3 Heater Blower Motor Speed Controller
Citroen C3 Heater Blower Motor Speed Controller
questions-about-a-citroen-c3-not-relate ... -t282.html
My Name: bill sutton

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Thanks for that, but which side and what is that a photo of? do I remove anything to get that far, or is it obvious when you contort your head in the footwell (again!!!!)
My Name: Missing Lincs

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Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.1
Fuel Type: Petrol
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Location: United Kingdom
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Its the drivers side footwell looking at the side of the centre console. The part circled is at the back of the dash (ie nearest the engine).
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
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My Name: C3driver52

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Posts: 1940
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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The picture is taken from the drivers footwell, you can just see the big white clutch spring on the right of the photo.
Its quite well tucked away, you will quite probably need a torch to see it. I don't think you need to remove any plastics to get to it.

The part that is circled is the fan resistor pack. That is the part between the fan speed selector and the fan, the bit that actually changes the power to the motor. When this fails the fan may run on maximum or just do noting, no matter what the control panel selection shows. The resistor pack was changed several times in production and different parts were used for different specification models.

Its a common failure and worth checking, some have a thermal fuse inside, but it may just be easier to get another unit.

The picture came from this post, questions-about-a-citroen-c3-not-relate ... -t282.html and there is some discussions about testing the unit there too.
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My Name: C3driver52

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Posts: 1940
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Has thanked: 114 times
Been thanked: 67 times

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Missing Lincs wrote: Its the drivers side footwell looking at the side of the centre console. The part circled is at the back of the dash (ie nearest the engine).
Oops, sorry Missing Lincs, I didn't see your post till I had finished writing mine :oops: , oh well a bit of duplication isn't a problem.

I think a few extra pictures showing the part in context will be nice

This was taken with the drivers door open, I was crouched outside the car and the camera placed in the foot well, directed at the fan controller pack. The clutch pedal spring, the steering column and the horizontal brake actuator bar can all be seen for reference.
Citroen C3 heater resistor pack location
Citroen C3 heater resistor pack location
I have arrowed the part and you can see it differs from the part in the previous photos. The car is a 2002 Diesel with climate control, so I guess that make a difference. It looks like this Citroen C3 Heater Resistor found on eBay
My Name: Missing Lincs

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Joined: Mon Mar 05, 2012 9:29 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.1
Fuel Type: Petrol
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Location: United Kingdom
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No problem C3driver. No one had replied and I thought Bill might be in need of information to get his repair underway.

I'm surprised to find something as basic as a resistor pack in such an otherwise sophisticated car. I know the control circuit is electronic so I would have expected fully electronic speed control, PWM or similar.
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
My Name: bill sutton

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Thanks guys, I will get round to it eventually but the wiper failure is my major concern at the moment as it rains a fair amount in Wales!!!! :(
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My Name: C3driver52

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Posts: 1940
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Has thanked: 114 times
Been thanked: 67 times

Post

Missing Lincs wrote:I'm surprised to find something as basic as a resistor pack in such an otherwise sophisticated car. I know the control circuit is electronic so I would have expected fully electronic speed control, PWM or similar.
I think there are 2 main ways the C3 does this, but both units are in the same place.

There is the wire-wound resistor, which appears on some models, I am guessing ones with more basic controls and they look like this
Image

then you have the ones you mention, looking a lot more solid state with a big heatsink strapped to it, as you say, probably got some mosfet doing the heavy work. They look like this,
C3 heater resistor pack with heatsink
C3 heater resistor pack with heatsink
But I don't really know which model or option has which resistor/controller

You can find the heater blower fan controller with the heatsink (like the one above) here on eBay
My Name: davidandpaula

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Thanks for the picture. Located and removed the module and am now waiting on delivery of the replacement module.

Being an Australian owner there is little support here for the Citroen.

The first module ( which is a collection of resistors and a thermal fuse is used in the basic models that have a "click" knob to select the fan speed.

Our Pluriel has a climate control unit and has the seconf module which does as somebody stated use a mosfet plus some surface mount components that include an IC which I assume is a Digital to analogue convertor.

Control unit shows off and 8 speeds available and bing a computer type that means a 4 bit binary signal.

The 2 pin green connector is +12V and ground.
The other has +12V and ground plus 4 signal pins.

Hoping new module from the UK, due today, fixes the problem. When I removed the module it was missing the upper securing screw, not surprising as it was assembled on a French production line I assume.

The other big repair I have had to do is the rear window winder mechanism caused by a broken cable. Once again eBay helped me source the parts from the UK for a total cost of about 40 pounds. To get a dealer to fix it would have been well over a thousand dollars with a wait of many weeks to get the parts sent from Citroen in France.

David
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