Citroen C4 gran picasso blower not working

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Daz1983
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Citroen C4 gran picasso blower not working

Post by Daz1983 »

Hi all,

So I recently declogged my wheel arch drain on my C4 Grand Picasso as it was filling up and of course entering my driver footwell, just before that, my blower sounded like it wasn't controlling itself (weird whizzing noise) then it packed in.

So far I have:
1. Checked all relevant fuses.
2. Checked the blower, looked in a bad state so I replaced it.

However it still doesnt work. Could it be a relay or resistor? The control is powered.

Any ideas would be greatly appreciated.

Thank you
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Re: Citroen C4 gran picasso blower not working

Post by GiveMeABreak »

There's a blower motor control module either mounted on the blower motor itself or separate to it. Pop your VIN up and we'll be able to identify it for you.
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Daz1983
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Re: Citroen C4 gran picasso blower not working

Post by Daz1983 »

Vin is VF7**************[VIN obfuscated, can be read by forum staff]
Last edited by xantia_v6 on 10 Oct 2019, 09:10, edited 1 time in total.
Reason: masking VIN
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GiveMeABreak
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Re: Citroen C4 gran picasso blower not working

Post by GiveMeABreak »

Ok, so you can see item (3) is the blower motor control unit resistor. It is part 6441CE and the power will go via this unit to the motor itself.

So if there is power to the resistor unit but not the fan, then it's likely this is your suspect.
daz.PNG
A genuine one from Citroen is £227.62 inc. VAT. There are aftermarket ones from £20 - but be aware a lot of these are of inferior quality and cheap rubbish.

There's a genuine Citroen one here from Eurocarcare for £116.40 inc. VAT:

https://www.eurocarcare.net/heater-cont ... -unit.html
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Bobhunn
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Re: Citroen C4 gran picasso blower not working

Post by Bobhunn »

Thanks for your help
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Re: Citroen C4 gran picasso blower not working

Post by Michel »

I had the same issue with my C4 GP, I bought a cheapo one off eBay and it lasted at least the 8 months I had the car, think it cost £23.99.
Daz1983
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Re: Citroen C4 gran picasso blower not working

Post by Daz1983 »

So I ran a fluke multi meter down all the cable from the control panel to the blower, turned out that the smaller connector had become damaged due to water ingress. So I replace the wire and connector, hey presto, one working blower!! Cheers for all the help!
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Re: Citroen C4 gran picasso blower not working

Post by Gbh »

Hi everyone this is my first post. So I have a c4 grand picasso petrol 2007 and my heater doesn't work but it does work only when the engine is on and the car is in reverse any ideas how to fix this please any help needed
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Re: Citroen C4 gran picasso blower not working

Post by GiveMeABreak »

That's an interesting one and will need a diagnostic to determine where the issue is. Because of what you have said regarding reverse gear, that indicates to me that the climate control may be malfunctioning - as when the car is put in reverse, it engages air recycling mode of the interior air , so that the air intake does not pick up fumes from the exhaust as the vehicle reverses.

Normally if it is the Heater Blower Motor Control Module you will get full blast of the Fan or nothing. So in this case we know the fan is working, which leaves me suspecting the climate control unit. But before you go replacing parts, try a BSI Reset / Battery Disconnect / Reconnect Procedure as this can reset any ECUs including the climate control ECU if it has a glitch. Failing that, a Diagnostic with a Lexia kit and Diagbox is really what's needed, then pop any fault codes up here (but don't rely on a basic code scanner as these often will not pick anything other than basic OBDII codes).
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Gbh
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Re: Citroen C4 gran picasso blower not working

Post by Gbh »

Thank you I'll give that a go and get back to you 🙂
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Re: Citroen C4 gran picasso blower not working

Post by Gbh »

I tried what you suggested but to no luck I only have a basic scan tool and it only keeps showing P0485
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GiveMeABreak
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Re: Citroen C4 gran picasso blower not working

Post by GiveMeABreak »

P0485 is a coherence fault with the engine cooling fan. So I would investigate that first as it may well be impacting on the other vehicle's systems.
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Gbh
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Re: Citroen C4 gran picasso blower not working

Post by Gbh »

OK that sounds fun hahah
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Re: Citroen C4 gran picasso blower not working

Post by Gbh »

Does anyone have any ideas where to start?
mattwharton
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Re: Citroen C4 gran picasso blower not working

Post by mattwharton »

My heater blower keeps cutting out completely is this likely to be the resistor?
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