Interior heater fan not working

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My Name: Ivor Wrongun

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Hello everyone... I am tearing out what little hair I have left over my wifes C3.
The heater blower is not working at all, I have tried...
Fuses (all 3)
Fitted new resistor
Fitted new blower motor
Fiddled with wires

The control panel operates heated rear window and all gauges move freely...any ideas??
My Name: Ivor Wrongun

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It is a 2002 1.4 Petrol SX with standard A/C.....
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My Name: C3CAR

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Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Welcome to the forum Ivor Wrongun

You don't have much left to change, only the control panel switch that powers the blower motor.

To get the control panel out, you need to remove the radio with some of these special tools (here)

Then remove the cubby/drawer/multichanger by using the tools for the multichanger or tugging at the drawer

This should reveal a couple of screws that hold the control panel in place.

with access to the back of the control panel, you can use one of these: multimeters

and check for an output to the motor on pin B4

or just fit a Air Con control panel (from eBay).
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My Name: Arfur Dent

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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
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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A picture of the screws that hold the heater control panel in place.
Heater control panel screws
Heater control panel screws
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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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There is also a motor control module which is on the RH side of the heater unit (near clutch pedal).

The control panel sends signals to the BSI, it sends signals to the control module. I the module has failed the fan will be dead.
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
My Name: Ivor Wrongun

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Posts: 7
Joined: Thu Nov 15, 2012 9:58 am

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I have now tried a new control panel with no luck :cry:

The motor control module? from your description is it located by the resistor or is it the same thing...

I am very close to giving up!!
My Name: Ivor Wrongun

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Also my dad mentioned there may be a relay??? I cant seem to find any reference to one any where, I have even bought a Haynes manual which has now been added to my list of.....

"Things to buy when trying to solve a problem with no success"....soon to hit all good book shops ;)
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My Name: C3CAR

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Posts: 2706
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 99 times

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Ivor Wrongun wrote: I cant seem to find any reference to one any where, I have even bought a Haynes manual
If you look in the haynes manual at the wiring diagram for the air conditioning/blower for your car, you will see that there is only one relay for the blower/air-con, in the engine bay fuse box and is associated with fuse F8. The relay switches in power to the control panel on pin B6. If there is 12v at B6 on the control panel, the the relay is ok.

Did you...
C3CAR wrote:and check for an output to the motor on pin B4
as this can save loads of bother if it turns out to be an earth fault at the blower motor or a second defective motor.
My Name: Ivor Wrongun

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Posts: 7
Joined: Thu Nov 15, 2012 9:58 am

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Thank you c3 car for taking the time to help...

I checked both blower motors (current and new) by placing wires directly on battery and they both worked.

The connector that goes into the blower had no power going to it as my dad checked voltage...

We tried to check panel but the points of his voltage meter were to big to touch the metal part of control panel.

I really appreciate your help :D
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My Name: C3CAR

Guru
Posts: 2706
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 99 times

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Ivor Wrongun wrote:We tried to check panel but the points of his voltage meter were to big to touch the metal part of control panel.
You can poke a pin into the back of the plug (or something that's conductive and small enough to fit). Then take the voltage off the pin. Its called 'back probing', a useful and common way to check the voltage on a plug without doing any damage.

Doing some simple checks on the electrical circuits of the car can save the unnecessary expense of purchasing and changing bits that don't need it. The down side of this is that you don't gain a much experience in removing and refitting bits. :)

Ivor Wrongun wrote:The connector that goes into the blower had no power going to it as my dad checked voltage...
Then I would check the voltage on B6 on the control panel. This could be considered the 'input', if the blower motor plug is the 'output'. No input = No output.
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