C4 Cactus 1.6 BlueHDI 2014 possible blower motor resistor issue

[martin_b]

About 2 hours into a 3 hour drive a couple of days ago I noticed that the windows started fogging. A/C was on as it always is. We were three people in the car. I then noticed that little to no air was blowing through the vents. I then toggled between re-circualation and fresh air intake which made no difference. Then I set the blower to max and air started to blow. I let it blow for a couple of minutes until the fog had disappeared. Then I could set the fan speed to the lowest setting again and everything seemed to work.

I suspect this could be an issue with the blower motor resistor as it resembles something I've experienced in other cars I've owned.

Today I removed the plastic covers under the glove box as well as the cover with the air-vent that blows in the direction of under the seats to the rear seats. I expected to find the blower motor somewhere under the glove compartment. But as far as I can tell that's not where it is. I also couldn't identify anything looking like a resistor. I do seem to remember to have read somewhere that I'm looking in the right place. I have a left hand drive car from 2014.

Can anyone tell me where to find the blower motor resistor and where the blower motor is located?

Thanks,
Martin

[GiveMeABreak]

I doubt it will be the blower motor control module, as this is usually all or nothing when it fails. The fact that you can adjust the speed (if that's what you meant) should rule this out.

You should really leave it on automatic mode. Recirculation mode is only really for use in standstill traffic or smells will just recirculate stale air. The climate control system should automatically partially recirculate the air automatically when the sensors detect certain pollution / contaminants in any case. So this may of been what has happened until you manually overrode the system.

[martin_b]

I must not have made myself clear. Sorry for the confusion. I don't suspect the blower control module. I have no climate control. And I always have it set to fresh air intake. I adjusted the fan speed and toggled on re-circulation as way to diagnose the problem. The fan was not blowing. It "re-adjusted" after I set it to max for a couple of minutes. Then I could set it to the lowest speed again and it would (and still does) blow fine.

I suspect it is the blower motor resistor which I can read is a common issue on the Cactus. Do you know where it is located on mine? VIN: VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

No, I understand you perfectly. What I'm saying is the fan blower speed is called a blower motor control module. It is made up of multiple resistors, and if these fail the default is to blow on at full speed.

If it's working at all speeds, it's not that.

Anyway the module is located directly underneath the actual blower motor unit itself from the diagram Martin, item (6):

Part: 1610497380 if you think it is this.

I think you may need to remove the air ducting pipes to get to it though....

This is what you are looking for:

[martin_b]

Thanks, Marc! From another (kind of dead) forum the item #6 with the part number you supplied is indeed what is causing the behaviour I'm experiencing. Good to know that it's actually called the blower motor control module. The part number you supplied leads me to a resistor supplied by a manufacturer called BEHR and is, as far as I can tell, just a simple resistor. Much like I already knew from my old Pug 306 which was known to need to have the fan control resistor replaced from time to time. Here's the link for anyone interested: https://bartebben.com/catalog/product/v ... ory/42440/

Thanks for the diagrams; I am now ready to have another go at locating the part. From the other forum it's just a matter of unscrewing the torx #3 in you last picture and the resistor (control module) should be accessible. I'll keep you posted.

[GiveMeABreak]

BEHR are a good brand - don't go cheap or you'll likely have a fault soon after!

[Calzo]

Hi guys, I know this is an old thread but I've been suffering blower issues on my 2012 C4 1.6hdi VTR+ The problem being the blower fan is constantly on full power even with the ignition turned off, I have to disconnect the battery every time I leave the car.
Any ideas or pointers?
Cheers

[PaulC5]

The blower stopped working whilst driving on our daughter's Cactus (2016 1.6 hdi). It does not work on any speeds so might be the resistor.
There appear to be all sorts of prices, is Mahle a decent make, they seem to be mid way between the cheap ones and Citroen ones ?
Need to check though the part number is correct as above, 1610497380.
The car VIN is VF7**************[VIN obfuscated, can be read by forum staff] Thank you for any help.

[Calzo]

Check the connection behind the glovebox first, they are renowned for overheating and insulating themselves. Even if it looks OK test it. Mine looked perfect but had no continuity. Cut it off and scotchblock the the wires. Very easy to do.

[PaulC5]

A new resistor sorted our Cactus blower. I got a Mahle one, listed as OEM part and even had the Citroen part number 1610497380 on the box but that might not mean anything. It was from Leader Components LSC, £109, this compared to about £220 from Citroen. I could not get my hands on the car to fit it, our daughter is 30 miles away so they used a local garage to fit the part, only £69 labour so happy with this and it saved my back rummaging under the dash kneeling on the ground. I have not got the old part back from her but when I do I will post the measured resistances across the pins to compare with the new one - these all needed the meter set at 2000k ohms to give anything.

[PaulC5]

I now have the old resistor pack, I opened it up thinking there might be a resistor or something inside that could be fixed but it is full of tens of tiny electrical components so not what I thought a resistor pack would look like. There was a clear jelly over the components.
The old one marked as
Nagares BEHR
MTN/1-12 CE 859001
26/10/16 H 1.2 P1.0
CE 85900100U31L

New one
Mahle
MTN/1-12 CE 859002
26/02/24 H1.4 P1.0
CE 85900202MRBM

I measured the resistances across all the pins, on the ones including pin 1 the resistance would drop a bit each time I checked on both of them but on the old one after a few goes it went open circuit but if put in the fridge for a while it then gave readings until it warmed up. On both to get any readings on any pins the meter had to be set to the highest range 2000k ohms (so 2 million ohms).

Values given - new one / (old one) in k ohms
Pin 1-2 1491 / (1877 but then open circuit)
Pin 1-3 1485 / (1875 but then open circuit)
Pin 1-4 1195 / (1746 but then open circuit)
Pin 1-5 1133 / (1487 but then open circuit)
Pin 2-3 002 / (002)
Pin 2-4 458 / (459)
Pin 2-5 231 / (231)
Pin 3-4 456 / (457)
Pin 3-5 228 / (228)
Pin 4-5 227 / (228)