Electric Buffs out there: S2 Xantia TD strange problem

Unread post by **citroenxm** » 21 Apr 2009, 21:41

Hi All

Your thoughts on this: Ive a 1998 S reg Xantia S2 TD Estate in, with Air Con.. Firstly, the cooling fans didn't work, but I sorted that to a break in TWO wires behind the passenger headlight, so got them going...

However, prior to this, I gassed the Air Con up, and with the Dash Switch onthe compressor and fans DO NOT kick in...

The blower DOES NOT work unless its ONLY on full speed... and its ONLY when the blower in the car clicks on full speed does the Compressor AND cooling fans switch on....

As soon as I slide it to AUTO, the blower stops and so does the air con compressor and fans..

To me it looks like the blower is controlling the compressir / fans too.. which it shouldn't, as the many S2 cars Ive seen does not do this..

Does anyone have a NON HAYNES wireing diagram for the Blower and Air con system, or even a solution...

Cheers guys!

Paul

Citroenmad · Unread post by **Citroenmad** » 21 Apr 2009, 21:47

Could be the fan control relay or something like that?

Usually on cars with manual air con, when the fan is turned to off the air con does not run, so as the fan is off apart from on full speed the air con wont be coming on?

Sounds possible anyway

Chris.

Unread post by **citroenxm** » 21 Apr 2009, 21:49

Hi..AS I said. I DO NOT turn the fan off... I put it in AUTO!!

The fan only works in MAX SPEED... Its an Auto Climate system... not a manual system...

I HAVE had compressors and cooling fans working even when the BLOWER does not... with the slider in the AUTO position...

Rgds
Paul

admiral51 · Unread post by **admiral51** » 21 Apr 2009, 21:55

Hi Paul

I know most of this relates to S1 but in this thread Clogzz has got some wiring diagrams etc
Hope this helps

Colin

Unread post by **CitroJim** » 21 Apr 2009, 22:00

citroenxm wrote: Does anyone have a NON HAYNES wireing diagram for the Blower and Air con system, or even a solution...

The diagram I have Paul

It is here. It's the Australian version but it'll be fine if you look at it upside down

The solution? 'Fraid not, just yet

I'll sleep on it...

admiral51 · Unread post by **admiral51** » 21 Apr 2009, 22:11

Another thought Paul
As its S2 if you set it to demist windscreen the A/C should kick as i believe this is its default setting thereby setting the fans spinning at slow speed this should happen wether internal fan is on manual speed or auto (i think)

As the temperature control is all done by ECU i would hazard a guess that one or more ECUs are not getting the correct information but i have been known to be wrong in the past

Colin

Unread post by **citroenxm** » 21 Apr 2009, 22:20

CitroJim wrote:
citroenxm wrote: Does anyone have a NON HAYNES wireing diagram for the Blower and Air con system, or even a solution...
The diagram I have Paul It is here. It's the Australian version but it'll be fine if you look at it upside down

The solution? 'Fraid not, just yet I'll sleep on it...

Jim..

Cheers, made it a UK one now, the correct way up

Do you also have a FULL key for it too????? Thanks

Paul

Unread post by **CitroJim** » 22 Apr 2009, 07:11

Hi Paul,

The full key can be found in the back of the Xantia BoL, there's pages of them, just ahead of their wiring diagrams.

The key holds good across the entire range and is good from beginning to end of production.

let me know if you need the full key and I'll scan it although it's a big job!

citronut · Unread post by **citronut** » 22 Apr 2009, 07:58

Jim your new avitar should have bin whilst my jalopy was sitting on your drive, then viewers would think they were seeing double

TEA HE

regards malcolm

Unread post by **citroenxm** » 22 Apr 2009, 10:12

CitroJim wrote:Hi Paul,

The full key can be found in the back of the Xantia BoL, there's pages of them, just ahead of their wiring diagrams.

The key holds good across the entire range and is good from beginning to end of production.

let me know if you need the full key and I'll scan it although it's a big job!

Ah its the same stuff then! okay, that should keep me quiet this weekend! IF ITS DRY!!

paul

Unread post by **citroenxm** » 22 Apr 2009, 19:09

Hi...

Im on another scrounge now.. The BoL has NOT got a BLOWER diagram for an Air Con car, just a manual system...

The Air Con diagram Jim gave me conflicts with the blower circuit in the BoL, Jim, have you a better diagram of the blower system WITH AirCon..??

Many thanks

PAul

Unread post by **CitroJim** » 22 Apr 2009, 19:28

I'll look into it Paul,

I'll get the exact one for your car. BoL diagrams are generic. Mine are from an, erm, more accurate source

Clogzz · Unread post by **Clogzz** » 23 Apr 2009, 12:27

If the blower doesn’t spin for reasons of its own, the ECU won’t know, and will allow the aircon to run.
If the blower is stopped because of inputs from the ECU, then it will prevent the aircon from running.
Map of the internals of the transistorised blower below.

Unread post by **citroenxm** » 23 Apr 2009, 12:49

Hi clogzz
Thanks! So try a different transister board?? Ive got a couple of spare ones which I have no reason to beleve they are buggered.. as they come out of cars that I have later learnt they were Relay/ignition switch issues...

Cheers

Paul

Clogzz · Unread post by **Clogzz** » 23 Apr 2009, 13:22

Yes, because that will be the simplest to try first.
There still is a coherent action in that the aircon only comes on when the blower spins.

Top speed of the blower is the small relay bypassing the regulating transistors.
Input 3, called TDRV, operates the relay, and also goes straight to the transistor bases.
The input on pin 3 sets the speed, with 12V closing the relay, and turning off the transistors.
That can be measured by going through the manual speed settings.

It looks like your transistors do nothing.
Usually, the transistors go short, and the blower is flat-out before you turn the key to the starter.
Our tribal elder Jim has posted a list of voltages, probably in a ‘sticky’, but I haven’t found it yet.

French Car Forum

Electric Buffs out there: S2 Xantia TD strange problem

Electric Buffs out there: S2 Xantia TD strange problem

Re: Electric Buffs out there: S2 Xantia TD strange problem

Re: Electric Buffs out there: S2 Xantia TD strange problem