A/C Blower relay location

Hi all,

My blower fan is not working at all.

2008 1.6 hdi (light blue for any Car Talk listeners out there)

40a fuse is good. Tested and swapped with the other 40a fuse on the bsm.

I have tested the motor straight off the battery and it works good.

Tested two resistor packs and all good.

I have tested the control switch based on information found on this forum and I am getting information which suggests the relay is bad (supply voltage to the control panel goes from -14.5v to .0145v+ when I switch from off to on.

I don't have a Haynes manual so I am struggling to work out where the relay is located for the blower system.

I have found the glow plug relay and another relay under the lhs headlight whilst looking for the suggested relay box.

Can someone tell me where the relay is so I can replace the bastard? Hopefully it isn't one of the ones in the bsm.

Regards,
Curtis.

Hi Curtis

Diesel and petrol have different wiring for the blower motor, so be careful when checking diagrams that they are for the diesel engine.

You can pick up a Haynes manual for the C3 -here-, well worth picking up.

The relay that controls the blower fan motor on the diesel engine is inside (and not easily replaced) the BSM module.

The BSM is the engine bay fuse box, a straight swap for a like for like module from another C3, just ensure you have the correct 2002/2006/2009 cutoff. Its easy to check by just comparing what they look like on your car compared to the ones in the listings.

The BSM modules appear on eBay

Thanks for that.
Just to confirm, when you say like for like, do you mean if the bsm has the same layout whether from petrol or diesel or has a different number it will swap and work the same?
Regards,
Curtis.

I would go for as close as you can. Same fuel, same year, as close with the numbers as you can.

The BSM changed in 2006 and looks different so a pre 2006 won't fit the post 2006 facelift models.

Picking as close for year (and picking the same fuel) as you can will give you the best chance that it will have the same features, but I don't know if there were any changes to the BSM from 2006 to 2009. Probably not is my guess.

Other models in the Citroen range on the same year have similar electronic parts. A BSM from a C5 will fit the C3 on some years.

Luckily the BSM doesn't need any programming to work when swapped between cars.

Good luck

So after having a day of 45°C driving around without a working fan, the misso wasn't very impressed.
So I had another look at the system.
So some smarty engineer decided to attach one of the plugs for the 12v for the blower motor to the side of the metal pipes for the heater core (see below) This had a similar effect of putting a heat gun to the plug and allowing the main wires to overheat the plug. (Sorry no melted plug photos).
So I have bypassed the negative and positive wires around the plug and will see how they go. (Fix below) If this works for a while I will solder the fix in place and hopefully the car won't melt down.

Next issue is the noisy A/C compressor.

Cheers for your help.