air con gas

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marski
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Joined: 08 Jun 2002, 14:12
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air con gas

Post by marski » 22 Aug 2002, 01:09

does anyone know the weight and type of gas for the air con in a 1995 xm 2.5td vsx estate as mine needs recharging?thanks.
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NiSk
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Post by NiSk » 22 Aug 2002, 14:04

The gas is called R134 and if your system is completely empty it will require about 1kg.
//NiSk
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marski
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Post by marski » 24 Aug 2002, 13:19

thanks NiSK now the man can do the job.
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alan s
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Post by alan s » 24 Aug 2002, 18:05

marski,
Just out of curiosity, why did your repairer need to know that info???
The gas should be marked somewhere on the system in fact a couple of controls on the system is an indicator of whether the gas is R-134a or the old R-12 and the sight glass on the receiver dryer is the indicator as to if the system is totally or partially empty.
If partially empty and the amount of gas recommended for a full recharge is used, it still won't work until the system has leaked enough gas out to correct the imbalance. If the system is down, chances are that you have a leak, so this really has to be addressed prior to recharge.
I would suggest you ask a few questions prior to embarking on an expensive temporary exercise which this will be if a leak isn't found & fixed prior to recharging.
Alan S
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marski
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Post by marski » 31 Aug 2002, 03:11

alans----i had a new cylinder head fitted and pipes were removed.a friend who is a commercial trailer fridge engineer wasn't sure of the changeover year for cars using r12 or r134--no info under bonnet either.he used nitrogen for a leak test taking the pressure way above the norm,he then vacuumed for 30 minutes then charged with 1 kilo of r134.seems ok up to press.[of course it would work now the sun has disappeared].
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alan s
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Post by alan s » 31 Aug 2002, 03:41

That's fair enough. I just ask the question because often people think that topping up an air/con system is on par with topping up a radiator & don't realise how much care & attention is needed when working on these things.
I was reading a manual on refrigeration/air/con yesterday (I really should get a life at times <img src=icon_smile_wink.gif border=0 align=middle> and the tip was given in there that when a conversion is done from R-12 to R134a that the gas volume should be reduced by 10% and to expect a slight bubbling or cloudiness at the sight glass on the accumulator/drier.
If you feel that your temperature at the coil isn't quite down to where it should be or the compressor seems to be sounding as though it's really making the engine work in comparison to how it was previously or you see frost running along the line leading to the port marked "S" on the air/con compressor, get you friend to just remove a small amount of gas. These are the symptoms of an overcharged system.
I wouldn't bother doing it as a matter of course; only if the symtoms show as the volume of 1 kg was a 'ball park' figure as normally these are given right to the gram but by the same token, don't really have to be so deadly accurate.
Alan S
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