From: Duncan Wood on 7 Jul 2010 16:44 On Wed, 07 Jul 2010 21:33:05 +0100, Mike G <miktoolman(a)miktoolman.plus.com> wrote: > > "Mrcheerful" <nbkm57(a)hotmail.co.uk> wrote in message > news:0l3Zn.178946$Hs4.61291(a)hurricane... >> Mike G wrote: >>> "Mrcheerful" <nbkm57(a)hotmail.co.uk> wrote in message >>> news:Qv1Zn.178942$Hs4.156830(a)hurricane... >>> >>>> mind you one of my customers went to kwik fit for an aircon recharge, >>>> after about an hour they said they did not know why it would not >>>> work. I look forward to seeing the car in a month or so for its >>>> mot, I'll check out the aircon then and see what is really up. >>> >>> In your earlier post you said there will be some moisture in the >>> system. I can understand how that can occur if all the gas escapes, >>> but if the A/C system is still working, allbeit at reduced >>> efficiency, how does moisture enter a system that must still contains >>> pressure? Appears illogical. Mike >> >> not actually, when the air con runs with a reduced charge it can go into >> negative pressure on the suction side of the pump, it then draws in >> air/moisture anywhere it can, through joints and even through the rubber >> hose itself. > > I can understand how negative pressure could allow moisture to be drawn > in, > but would the system still work if that were the case?. > If one accepts that the performance of auto A/C systems usually > deteriorate > over years because of gradual gas loss, it would seem logical that if one > adds gas before negative pressure allows moisture into the system, that a > full purge of the system and refill can be avoided without detriment to > the > system. > Mike. > > For maximum effeciency the evaporator nearly always works under less than 1 atm of pressure, adding more fluid (short of massively overfilling it) won't stop that. -- Duncan Wood
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