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Aircon FAQ
Cars Maintenance General car maintenance (uk.rec.cars.maintenance)
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#11
 
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Re: Aircon FAQ -
05-14-2007
, 02:22 AM
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On Sun, 13 May 2007 23:30:12 +0100, Guy King wrote: The message <5apfosF2pgqk3U1 (AT) mid (DOT) individual.net from "Dieseldes" <desmond (AT) orange (DOT) net> contains these words: Simple vaccuum test and recharge, most aircon faults are as simple as that!, don't go looking for problems before they appear! The refrigerant must have got out somehow! The molecules are so small these days that the system can never be airtight and there will always be some loss at the seals even when there is no fault. |
no faults and my dealership said that it was absolutely normal. I get
mine recharged every couple of years and it's fine.
--
Z
#12
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The message <5apfosF2pgqk3U1 (AT) mid (DOT) individual.net from "Dieseldes" <desmond (AT) orange (DOT) net> contains these words: Simple vaccuum test and recharge, most aircon faults are as simple as that!, don't go looking for problems before they appear! The refrigerant must have got out somehow! |
does lose a small amount of gas, you may find there is still gas in it but
it's just below the pressure to allow the compressor to run, I have
recharged a few and they all had gas just not eough!
The system I have access to, removes all the gas before vacuuming, then
refills the system using the gas you have just taken out, 90% fo the ones I
have been involved with just needed a recharge,
The system measures the amount of gas when removing it so it's easy to see
how much has been lost, even my wifes 306 had about 400g of gas in it but
when it was recharged the condensor was leaking, so we quickly took the gas
out again! even when the pump in the xantia self destructed the compressor
part of it was intact it was the clutch bearing that broke.
Most aircon systems have between 700 to 900g of refrigerent, so if you lose
150g in a couple of years because the previous owner never used it and all
of a sudden no aircon!
It is possible you have a leak, then it is expensive to repair, but have a
test first, at around £60 it really is the cheapest diagnosis, and you may
end up with working aircon!! or go to halfrauds and buy a kit and shove some
gas in yourself!
Des
#13
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The molecules are so small these days that the system can never be airtight and there will always be some loss at the seals even when there is no fault. Mine always loses almost exactly 20% (by weight) per year. There are no faults and my dealership said that it was absolutely normal. I get mine recharged every couple of years and it's fine. |
help to minimise losses but it can never stop them completely.
--
Regards - Rodney Pont
The from address exists but is mostly dumped,
please send any emails to the address below
e-mail ngpsm4 (at) infohitsystems (dot) ltd (dot) uk
#14
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If the aircon is not used, weekly, even in winter the seal shrink and it does lose a small amount of gas, you may find there is still gas in it but it's just below the pressure to allow the compressor to run, I have recharged a few and they all had gas just not eough! |
--
Skipweasel
We have always been at war with Iran. [George Orwell - almost]
#15
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The message <1179109179.264776.47090 (AT) w5g2000hsg (DOT) googlegroups.com from DUBINOUT <renegadeautoparts (AT) gmail (DOT) com> contains these words: well first apply a vac to the system. the system must have a leak. if you have been retro fitted then just go to a shop and ask to have a test done. It's an original factory fit. As with most modern cars, access to all the bits is - er - iffy. |
If you can't pull a decent vacuum you have a pretty serious leak, most
likely the condensor on a mondeo....
If it pulls and holds a good vacuum, I would then do one of two things
depending on what the general condition of the system looked like-
a) begin to put a full charge in with a big shot of dye, running the system
with fingers crossed. If it appears to hold run the car around for a day or
two using the a/c as much as possible. If it conks, the leak will be pretty
obvious due to the dye. Fix leak, repeat.
b) Charge it with ~180psi of nitrogen and get round as much of it as
possible with the sniffer. Sit back for an hour or two, then re check the
pressure. If this appears ok, vac out, and go to a)
Obviously all of this is dependant on a local decent a/c guy who is more
interested in fixing your system than draining your wallet inbetween sucking
teeth...
Tim.
..
#16
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Obviously all of this is dependant on a local decent a/c guy who is more interested in fixing your system than draining your wallet inbetween sucking teeth... |
--
Skipweasel
We have always been at war with Iran. [George Orwell - almost]
#17
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On Mon, 14 May 2007 07:22:13 GMT, Zathras wrote: The molecules are so small these days that the system can never be airtight and there will always be some loss at the seals even when there is no fault. Mine always loses almost exactly 20% (by weight) per year. There are no faults and my dealership said that it was absolutely normal. I get mine recharged every couple of years and it's fine. Do you run it for a few minutes every week even in the winter? That can help to minimise losses but it can never stop them completely. |
fuel consumption as well as stopping the car from misting up inside.
--
SteveH 'You're not a real petrolhead unless you've owned an Alfa Romeo'
www.italiancar.co.uk - Honda VFR800 - Hongdou GY200 - Alfa 75 TSpark
Alfa 156 TSpark - B6 Passat 2.0TDI SE - COSOC KOTL
BOTAFOT #87 - BOTAFOF #18 - MRO # - UKRMSBC #7 - Apostle #2 - YTC #
#18
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Do you run it for a few minutes every week even in the winter? |
temperature is cold enough. Perversely, I'm most likely to switch it
off on a good summers day and open the windows and sun roof as I find
the A/C can dry my eyes out!!
Quote:
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That can help to minimise losses but it can never stop them completely. |
--
Z
#19
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Is there an air conditioning FAQ anywhere? I've a R-reg Moandeo which, not surprisingly, has lost its gas. I presume the previous owner hasn't spun it from time to time to keep the seals happy. Can I... a) replace the seals - presumably they're on the pump shaft. I guess they're not easily obtainable, that'd be too easy. b) assume that everything else will be OK or are there other bits that will have degraded as well? I wouldn't normally bother but we're going to France in August and it's bound to be sodding hot. My money is on the condenser. They corrode at about that age and I had |
fairly cheap on ebay but you will also need a new dehydrator and some
PAG oil. I think it cost me about £220 all in, including the re-gas.
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Paul Giverin
British Jet Engine Website http://www.britjet.co.uk
#20
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Is there an air conditioning FAQ anywhere? I've a R-reg Moandeo which, not surprisingly, has lost its gas. I presume the previous owner hasn't spun it from time to time to keep the seals happy. Can I... a) replace the seals - presumably they're on the pump shaft. I guess they're not easily obtainable, that'd be too easy. b) assume that everything else will be OK or are there other bits that will have degraded as well? I wouldn't normally bother but we're going to France in August and it's bound to be sodding hot. Can't you just sport a knotted handkerchief on your heads like the rest |
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Roger Hunt
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