Can’t turn off the air conditioning on my Citroen C5 2010

[seyha]

Hello everyone i will be glad if someone can help me with this. I replaced the polen filter and since then i can’t turn off the fan on air con. Just blowing on max speed all the time. Trying to turn off or adjust from control panel not doing anything. Any ideas!

[GiveMeABreak]

The pollen filter change won't affect the blower. The only thing you may have done is dislodged some of the wiring near the pollen filter.

There is a blower motor control unit located near the pollen filter that you may have moved that could of caused this.

Blower Motor Control Unit	Location of Blower Control Unit

[seyha]

Thanks for reply. Tried but nothing happened the blower motor looks fine. Still running and i can’t turn off. Any other ideas?

[GiveMeABreak]

The blower motor control unit is probably faulty then. They do fail and this is one of the symptoms. I would suspect this over the control panel to be honest. Do you have access to Diagbox for a test to see what, if any fault codes are showing?

Failing that pop up,or post your VIN and I’ll get you the part number.

Edited to state ‘Blower Motor Control Unit’

[Paul-R]

The blower motor is probably faulty then. They do fail and this is one of the symptoms.

How does that work Marc? TBH I can't see how the motor can be faulty and give this symptom.

A motor can only go at the speed dictated by the control unit and this is supposedly set by the control panel. Into that mix you have to add the BSI and, if there's a separate one, a heating ECU. Something there has to be the problem surely?

[xantia_v6]

The motor has the speed controller built-in which can fail.

[GiveMeABreak]

The blower motor is probably faulty then. They do fail and this is one of the symptoms.

How does that work Marc? TBH I can't see how the motor can be faulty and give this symptom.

A motor can only go at the speed dictated by the control unit and this is supposedly set by the control panel. Into that mix you have to add the BSI and, if there's a separate one, a heating ECU. Something there has to be the problem surely?

Yes I should of said Blower Motor Control Module again Paul, that’s what I was talking about as I was carrying on from my previous post showing the module in the diagrams. On the X7 they are separate to the Motor unit itself, unlike the Xsara Picasso and others of that era that had the resistor units on the motor on some models.

I’ve edited the post to now add this bit on, thanks.