Xantia v6 blower

Lancaster-c5 · Unread post by **Lancaster-c5** » 01 Feb 2009, 17:43

Hi all, I have a Xantia V6 1997 R reg.
I have looked at the threads for blower problems and tried to find the
right fix for my car,basically when the ignition is switched on the blower
will not work .There are 12 volts at the blower plug between the Black & Red wires,but no variation when you use the speed control. Should I look at the blower or start from the ignition switch.There are two green relays above the throttle pedal both click when ignition switch is turned, are they for the two rad fans or for the blower.
Many thanks Howard.

jgra1 · Unread post by **jgra1** » 01 Feb 2009, 18:52

Howard... when you say the blower wont work.. do you mean with ignition, or ignition and engine running?

John

Lancaster-c5 · Unread post by **Lancaster-c5** » 01 Feb 2009, 19:26

John .
This is with the engine running.
Howard.

jgra1 · Unread post by **jgra1** » 01 Feb 2009, 19:29

hmm ok.. a fair few people have had blower problems... try a search on heater on here to see what it brings up...

Unread post by **CitroJim** » 02 Feb 2009, 11:17

Hi Howard and welcome to the forum

You may just find this threaduseful.

It will prove if the blower, the speed controller or the aircon ECU is at fault. The thread under reference also contains a full wiring diagram.

Lancaster-c5 · Unread post by **Lancaster-c5** » 05 Feb 2009, 10:48

Hi Jim
I will try your suggestions with the meter ,when it stops snowing.
Howard.

Lancaster-c5 · Unread post by **Lancaster-c5** » 05 Feb 2009, 18:45

Hi
Its stopped snowing and with the engine running I have put the meter on the Orange cable ,moving the slider to its various settings it only has
1.25 volts on all settings.Any ideas for the next step please. Howard.

Unread post by **CitroJim** » 05 Feb 2009, 21:18

Hi Howard,

No worries, finding an unvarying 1.25V there may point to a faulty A/C ECU or it could point to a faulty blower speed controller.

You cannot directly test the voltage on the orange wire with the blower speed controller disconnected as I suspect the output from the A/C ECU is open-collector, given the 820 ohm pull-up resistor on the blower speed controller. It is possible a faulty output transistor on the module could pull down the control line; it is connecetd directly to the bases of the output transistor pair.

You can easily test the blower speed regulator. Remove the blower from the heater box (three screws accessible by the pollen filter), then remove the motor from the housing to expose the blower speed regulator.

With reference to the picture below:

Using a multimeter on the 2K range (or preferably on the diode test range) measure between the terminal marked "Output" (actually the motor negative return) in the picture and the heatsink. If you hare using a meter with a diode test range you will see continuity (600ohms roughly) one way and an open circuit if you reverse the meter leads. If you see a short-circuit or a very low resistance whatever way the leads are placed, at least one of the transistors are short-circuit (both are in parallel).

The transistors can be further tested with a meter on the diode test range by placing the negative test lead on the Base ("B") of the transistor and the positive lead to the Emitter ("E") and Collector (Heatsink) in turn. Both ways you should see continuity in the region of 900 ohms. Reverse the lead polarity (i.e. Positive test lead on the Base) and you should read an open circuit between Base and Emitter and Base and Collector. Short Circuits or very low resistances anywhere indicate faulty transistors.

If that checks out OK, a fault in the A/C ECU may be present. This is very rare however and it is more likely to be a wiring issue between the ECU and blower speed regulator.

If the regulator is faulty Howard, I can repair it for you, or supply a new pair of transistors.

Lancaster-c5 · Unread post by **Lancaster-c5** » 06 Feb 2009, 14:07

Hi Jim
Thank you for your reply. I have taken out the blower from the car,are there any hidden screws or will the motor pull out of the housing ?.
Regards Howard.

Clogzz · Unread post by **Clogzz** » 06 Feb 2009, 14:54

A common speed controller fault is the wiper going askew first, and then falling out:

http://www.frenchcarforum.co.uk/forum/v ... hp?t=23767

Blower disassembly pictures from citroenthai:

Unread post by **CitroJim** » 06 Feb 2009, 17:26

Thats an excellent set of pictures Clogzz

Good find!

I need to repair the blower on my V6 (and do the same job as you on your heater matrix elbow) but I cannot get to the car for snow and ice today

Unread post by **xantia_v6** » 07 Feb 2009, 07:39

CitroJim wrote:Thats an excellent set of pictures Clogzz Good find!

I need to repair the blower on my V6 (and do the same job as you on your heater matrix elbow) but I cannot get to the car for snow and ice today
'97 Xantia V6 Project 2009 - Dead Autobox

Rearranging the deck chairs??

Unread post by **CitroJim** » 07 Feb 2009, 08:26

xantia_v6 wrote: Rearranging the deck chairs??

Seems a bit like that I admit but just a case of getting the small jobs out of the way before going for the big one....

As soon as the 'box is fixed, I want to enjoy the car without niggles like blower etc...

addo · Unread post by **addo** » 07 Feb 2009, 09:09

Ah yes; the not-infrequent jibes when driving a Xantia with no carpet "Oh, the stripped-down rally model" tend to leave one determined to fix things properly and durably...

Clogzz · Unread post by **Clogzz** » 07 Feb 2009, 16:18

Good find!
cannot get to the car for snow and ice

Hi Jim,

I’ve put the pictures in safekeeping in two unrelated places, and anyone can save them anyway.
Here’s where they come from, mentioned in an old topic:

http://www.citroenthai.org/diy/blower.html

Would like to fiddle with the car too, but it’s too hot to do any work here, 30ºC every day … probably better than snow and ice.