Replacing Xantia Harisson compressor

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lazza
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Replacing Xantia Harisson compressor

Post by lazza » 20 Jul 2010, 13:07

Hi Forum

I'm about to change the aircon compressor on my Citroen Xantia. I seem to remember hearing that i should change the dryer at the same time??

My general question is: What should I change aswell as the compressor?

Thanks very much

Larry

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vanny
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Post by vanny » 21 Jul 2010, 21:36

Why are you changing the compressor and what are you changing it for (new, old, recon?).

You will likely need to add oil to the system.

It might be worth flushing out the pipes if the system is contaminated.

lazza
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Post by lazza » 23 Jul 2010, 10:24

HI thanks for your reply

when you say add oil to the system.. do you mean i need to directly put oil in the compressor??

i thought that when they refill the system with gas, that they automatically put in a percentage of oil.

can anyone enlighten me?

thanks
Larry

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xantia_v6
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Post by xantia_v6 » 23 Jul 2010, 11:36

The oil in an A/C system is in one of 3 states:
a) dissolved in liquid refridgerant
b) being blown along by gaseous refidgerent
c) sitting in the sump of the compressor

The oil in the compressor sump acts as a reservoir.

If an A/C system looses gas over a period of several years due to porosity, or the compressor shaft seal, very little oil is lost, so a standard re-gas does not include any oil. If any component is replaced, a new component is supplied dry, so an amount of oil corresponding to the residue in the removed component is added.

If there is a large leak that causes oil loss, the operator just has to guess how much oil to add (and sometimes what sort!).

If a used compressor is fitted, it is also a guess as to how much oil is in it (some have a drain plug, but even that seldom allows all the oil out).

In situations like this you need luck, or an experienced operator to guess the amount of oil to add.

lazza
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Joined: 08 Sep 2008, 09:04

Post by lazza » 23 Jul 2010, 12:36

Thanks very much for your reply

I am replacing it with a 2nd hand compressor- which I presume still has oil in. To be on the safe side:

How much oil should I add?
How and where do I add it?


Many thanks
Larry

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MikeT
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Post by MikeT » 23 Jul 2010, 13:01

Hi Larry,

Sorry I can't be of more help as I have little to no experience of A/C systems other than common knowledge.

What I can say is that compressor came from a filled system (on removal I accidentally punctured the condensor and the gas leaked out) and in my care, have not noticed any oil seepage from the compressor so, hopefully, there's still the right amount in it.