Xantia HDi aircon pump! GRRRRRrrr

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trooper30
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Xantia HDi aircon pump! GRRRRRrrr

Post by trooper30 »

Alright fellas, well I had the aircon regased on the HDI today and the guy told me that although the the aircon system is not leaking and is full the pump in not cutting in!
IT was cutting in just a few months ago, but now it aint! Could this be something simple like a fuse somewhere or a relay? I know for sure the pump worked fine untill it ran out of gas so I just cant see how it could be the pump.
Any ideas would be appreciated fellas.
Cheers
2000 Xantia Hdi
2006 Laguna DCi
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DickieG
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Post by DickieG »

It might be worth getting a Lexia session done to see what the cause is before you spend money chasing red herrings. Obviously check the fuses and that the heater fan is running then failing that and any electric plugs not connected, I think Lexia is the way to go.
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trooper30
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Post by trooper30 »

Well just been out and pulled all the fuses one by one and there all ok,and the fans runs on all speeds, also the aicon switch lights up when turned on so im lost. Per usual! lol
Last edited by trooper30 on 02 Aug 2011, 17:48, edited 1 time in total.
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KevMayer
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Post by KevMayer »

From memory I think that a bad connection on the aircon pressure switch can stop the pump running, that or an actual low pressure.

Try pulling the plug off and putting it back on to see if that cleans up the contact.
Cheers, Kev

02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).

Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
trooper30
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Post by trooper30 »

Aircon pressure switch??

And where is that? Is that the electrical conection to the pump?
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DickieG
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Post by DickieG »

I think its the one located alongside the ECU box on the offside front, its attached to the top of a cylinder with the silver alloy A/C pipes running to/from it, often with a sight glass on top.
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trooper30
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Post by trooper30 »

Cheers for that, found it, cleaned the connections, no dice! :(
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Jaf
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Post by Jaf »

Sorry can't help with the air con fault (except that it took 4 air con "specialists" to get my air con to work so might be worth taking it to another guy). Just wanted to ask you something actually. Did you notice a big difference in fuel economy with the air con on?

Good luck.
Fred, a silver 1998 1.9TD SX Xantia.
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Post by KevMayer »

My next thought then is... can this fault be due to the Bitron relay?

The Bitron is part of the fan control.

Are your fans working? Possibly with no fans running the aircon may not cut in. edit:- you already said fans run ok...so not this

By the way, the aircon compressor pulley should be turned by the aux belt. The electromagnet clutch on the compressor pulley should close to drive the compressor. With aircon off this pulley is freewheeling.

Have you tried opening and remaking the electrical connection to the electromagnetic clutch mechanism. It is probably the only connection on the compressor.
Cheers, Kev

02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).

Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
trooper30
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Post by trooper30 »

thanks for that Kev but when your talking electromagnetic clutch mechanism, well you might as well be saying flux capacitor to me! lol
Will have a look at every connection that goes near the pump tomorrow, get some WD40 on it all to clean them, and will probably be back to moan on about it more! lol

And Jaf, when it was working I didnt see much difference in fuel economy with the air con on at all m8.
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2006 Laguna DCi
trooper30
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Post by trooper30 »

Well today I cleaned the conections I could find but no change, strangley the aircon switch on the dash has no stoped lighting up in the on possition, could this give any clues to a cause??

Cheers fellas
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fridgedoc
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Post by fridgedoc »

Hi Trooper

first things first and I am going through this idiot fashion.

is it hot enough for the A/C to work ?

do you have the temp cotrl at its lowest setting?

the heater/A/C fan must be running

still not working?

I am always suspect when people say "I've regassed it and there is no leak"
(as an engineer I hate that saying as it is a R134a REFRIGERANT system and should be charged in its LIQUID FORM)

what he really means is "he has bunged refrigerant into the system and had a quick look around = no leaks"

very rarely do systems loose their refrigerant without a leak on the system and because they stopped using R12 (to save the world and make loads of money) R134a does not leave an oil trace, most not ALL motor mechanics sorry technitions not diddy squat about A/C, I'm guessing all the refrigerant has leaked out, you might to lucky and find a trace of oil around the pipework near the condenser which looks like a rad in front of the rad but smaller if no luck there.......................

you need to remove the plug off the drier, bit with the sightglass in the top and get a 55mm piece of thin insulated single core wire cut back the insulation off each end about 10mm you are going to use this to short across the terminals,ignition on car NOT running A/C switch on, then short across the terminals there might be 3 or 4 wires (2 will be the high pressure switch and 2 will be the low pressure switch or if only 3 wires 1 will be live and 2 and 3 the switches, sounds complicated but its not, as you short each 2 wires you need to listen for a click that is the clutch on the compressor coming in and out ie you should hear one click as you make contact and another when you break contact.

Let me know how you get on
Bonne Chance

Stephen

LHD Xantia 1994 (deceased)
LHD Xantia 1995 Berline
Derekofpriory
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Post by Derekofpriory »

Hi, sorry to say that the Hdi doesn't have a bitron doochat! When I was having fan/temp gauge problems I started tracing wires and found a broken wire into the multiway connector that lives down near the side of the battery on the nearside inner wing, Thanks are due here to Clogzz for his insight. Purely by co-incidence and having fixed the original problem the A/C then started working, that was going to be my next job on the monster!
How the multiway connector is actively involved in the A/C circuit was beyond my understanding, I'm just pleased it works.
our car spent Friday afternoon and Monday morning in the electrics area of the Factory!!
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