Xantia A/C

Post your Cit/Peu/Ren air conditioning queries or advice.

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white exec
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Re: Xantia A/C

Post by white exec »

Last time I pulled the connector from the temp sensor on the XM (pretty much the same system as Xantia), with the IGN switched fully on (but engine not running), the fans immediately started at slow speed for a couple of seconds, and then jumped to fast speed. Re-connecting the sensor left the fans still running fast, but this could be "reset" by switching IGN off then on again, when everything reverted to normal.

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Re: Xantia A/C

Post by admiral51 »

To be honest with the engine off and ignition on both fans took a couple of seconds before they went full chat no slow speed and i think they stopped when plug was put back in, not checked back on previous posts but do not think i needed to switch ignition off.
As info from previous posts has explained the difference between Brown/Blue stat plugs i think by having the engine running and unplugging/refitting has done something but why i have no idea

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Re: Xantia A/C

Post by admiral51 »

Ok a quick update
I have done something, why or how i have no idea, but everything still works as it should after the unplugging of the Blue Stat plug with engine running apart from one issue that i have now isolated.
The slow speed fans do not always work, at first i thought i had a weak fan ( RH looking from in front ) as stated in earlier posts, but i have found that when everything is ok both fans spin as they should, when they do not a tap on the slam panel they both spring into life, and same way when working a tap will stop them.
So i do have a contact issue with the relay and the fan, the relay i know is good as it works as intended so contact tracing is all the rage these days i should be in luck :)

Side issue if anyone could provide me with a part number for the A/C compressor just in case when i go to get it regassed and nothing happens lol

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Re: Xantia A/C

Post by white exec »

A bang on the slam panel could be nudging a reluctant relay into operation. Start with those - base contacts and internals.

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Re: Xantia A/C

Post by mickthemaverick »

admiral51 wrote:
31 May 2020, 17:06

Side issue if anyone could provide me with a part number for the A/C compressor just in case when i go to get it regassed and nothing happens lol
If :) when you go for the recharge the system can sustain a vacuum but does not get cold then check the A/C clutch is operating before you go buying a new compressor. My system gassed ok which means the compressor does not leak so unlikely to be faulty but if the clutch doesn't operate you can just replace the clutch for a fraction of the cost of a whole compressor. The job cost me just over £60 rather than the £400+ for a compressor. I got the clutch from Poland on ebay, and its just coming up to a year's use now and still working fine. :)

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Re: Xantia A/C

Post by xantia_v6 »

A thump on the slam panel could also start a fan with worn/sticky brushes. When they are (unexpectedly) stopped, try nudging each fan gently with a stick to see if that provokes it.

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Re: Xantia A/C

Post by admiral51 »

Thanks Guys
I have replaced all three relays with new 5 pin ones and i still have 7 more new ones left :)
At first i thought it was a sticky l/h fan, giving it a nudge with a screwdriver would sometimes make it spin okay but then sometimes it would spin slowly, then speed up a bit and then slow down and then get up to speed,as they run in series at slow speed the r/h fan was following the same pattern so in my mind it was a contact issue.
Giving the slam panel a thump they both spin up at full slow speed together and most times a second thump they both stop.
A short 2 mile test journey today with them running at the start they were not running on the return, yet a thump again on the slam panel they started up so in my mind it is a contact issue which must be related to the l/h relay as the r/h fan spins up every time with the stat plug removed at full chat.
Mick where did you get the clutch replaced, as rumour has it they need shims and are a real PITA to remove and £60 is a price i like lol
Colin

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Re: Xantia A/C

Post by mickthemaverick »

I got the clutch on ebay, this is a link to his current ad: https://www.ebay.co.uk/itm/AC-Compresso ... 4434b1d25f which may not be the right one for your car but it is a place to start. I did the job myself with car on axle stands. I took the compressor off and replaced the clutch on the bench plus a visit to my local Citroen specialist who actually did the shimming for me and included it as part of the regas cost which followed the rebuild. The job was detailed at the time: viewtopic.php?p=612544#p612544
I may have slightly misled you about the pricing. My clutch was £78 and £60 for the regas and shimming. The job was not that difficult although you do have to remove the inner wheelarch to get access on the 2.2. Oh and the compressor slipped out of my hand and banged me on the head at the time so keep your head away from under it as you remove it :-D . Hope that helps Colin

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Re: Xantia A/C

Post by admiral51 »

Just a quick update.
As most of you pointed out way back in this thread i can confirm i have a dead fan :(
Now on the lookout for a replacement but unable to find any thing for the correct 200W rating.
Colin

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Re: Xantia A/C

Post by admiral51 »

Most of the fans/motors on sale show up as having a diam of 320+ where as my fan has the diam of 305.
I think i should be able to get one with a larger diam and just swap the blades over if the connectors and fixing points are the same ( you all know my logic lol )
Another avenue is getting both existing fan motors reconditioned if i can lay the car up for a week, any thoughts ?
Colin

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Re: Xantia A/C

Post by xantia_v6 »

The fan motors are riveted togther is a way that makes it difficult to rebuild them. I have pulled them apart but never contemplated reassembly.

The power rating of the fans is not very important, as long as you buy a matched pair. Note that PSA fans of the period sometimes had the blade fastened with a left hand drive screw (e.g. the Xantia) and others had the fan blade fasted with a clip or pin, so if swapping the blades, make sure the replacement motor has the correct type of shaft.

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Re: Xantia A/C

Post by admiral51 »

Thanks for the info, just assumed they were all the same with a screw.
Have put some feelers out with some local firms that claim they can refurbish the motors so the info on being riveted is something i can pass on.

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Re: Xantia A/C

Post by admiral51 »

Still struggling to find a replacement fan of the same power rating, so looking at 1 from a 1.8 petrol from a similar age car.
Assuming it is of a lower power rating than my current set up if i replace the dead one that is the main slow speed fan with a lower power one then my thinking is this.
Lower power main slow speed fan will make the other run at same speed as they are in series on slow speed, but both will run at full power ( regardless of power rating ) when at full speed as they do run not in series at full chat.
If i swapped them round so higher power fan was main slow speed fan it could cause issues with the lower power fan in series ?
2 fans running at slow speed is better than none and if it gets to full speed i have a problem anyway ?

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Re: Xantia A/C

Post by xantia_v6 »

I think that you will find that the fan motors from a 1.8 (with A/C) may be higher power than yours, I recall that they are the same as fitted to the V6.

You should really swap them as a pair, for one thing, your remaining motor may not have much life left in it.

There is no concept of a main low speed fan, they have an equal current flowing when connected in series, the split of power between the motors depends on their characteristics, but the less powerful motor is likely to have a higher voltage drop and be doing more work.

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Re: Xantia A/C

Post by white exec »

The fans must be of identical wattage and type.
Yours are 200W motors (pt no 1253 33), and were fitted to Xan I, Xan II and ZX petrol.

As Mike says, the fans always work together, never separately.
Slow speed achieved by the fans being connected in series.
Fast speed, by fans in parallel.
Essential that they both operate at the same speed and air delivery, otherwise nasty "beating" and vibration effects can happen.