Re: AC problem

[John Lagnese <jlagnese@cybertours.com>]

Dave,
My 87 16V Scirocco had the a/c taken out when I got it. I've just come by a
compressor. I was told I would need a reciever(since its been open) which is $24
at VW. Is there anything else I should worry about? I'm going to bring it to an
A/C shop.
Thanks,
John

dcewing1 wrote:

> If you put too much oil in the A/C system it isn't going to work right.  The
> squeal you are hearing is more than likely the clutch going bad, or gone
> bad.  The only other thing it could be is the tensioner or the compressor
> screamming out because TOO MUCH LUBE.  When recharging, you only have to add
> the amount of oil that you think it may have lost.  An A/C system is just
> like a motor, it only takes so much oil.  You can trash your A/C system by
> putting too much oil in it.  I would take it somewhere where you can have
> someone evacuate it.  This pulls everything out until there is a vacuum of
> around 28-30 psi.  Once the evacuation is complete, the machine will shut
> off, then check the gauge and see if it drops at all.  If it does, (drops to
> 15-0 psi of vacuum), then more than likely you have a leak.  At this time,
> put around a 1 lb charge into it then use a leak detector sniffer and check
> for leaks.  If you don't want to take it to a shop, you will need to follow
> the A/C lines through the whole system and check for oil seeping around
> fittings/gaskets/seals/maybe holes in the condensor or evaporator.  Whatever
> you do, make sure you don't BREATH the R134a.  It damages your lungs,
> PERMANANTLY!!  And, if your system has a sticker that says it has PAG oil in
> it, don't even touch it.  PAG oil will eat whatever it touches and there is
> no neutralizer, you just have to wait until it stops eating (and you can't
> wash it off!)  I am a technician and I don't even touch those systems.
> Anyway, that is the BEST way to do it.  More than likely, you got too much
> oil in it and it sounds like the clutch is screaching.  I couldn't tell you
> that it is because of the amount of oil you put in, but it is a possibility.
> One last thing.  R134a is a lower pressure coolant.  You have to put a
> little more R134a in than the amount of R12 your system calls for.  Again,
> if the pressures are too high, you could mess up your system, if it is too
> low, then it won't get cold enough.  If you put enough in to get it to
> around 38-42 deg. F while driving, it should be fine.  If you get any
> colder, the evaporator could freeze up or the system could burn up
> (compressor).  If you charge it when it is around 55 - 75 deg F outside,
> around 40-45 deg f. at an idle should be ok.  I know all of this sounds
> complicated, and an A/C system isn't all that complicated, but there are a
> lot of things you need to watch out for that only experience can teach you.
> Good Luck!!
>
> Dave
>
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