AC Question

[cobram at juno.com]

I always add oil by pulling a vacuum first (I use an el cheapo compressed
air vacuum pump) with gauges hooked up.  Once you have a vacuum in the
system close the two (one) valve and put the end of the feed (middle one
on the gauges you were just using for vacuum) hose in the amount of oil
you want put into the system, open the valve a little and it'll suck the
oil right into the system.

If you have two available ports it's sometimes easier to hook the vacuum
pump up to one port and suck the oil in the other port.

If you've already charged a system, most FLAPS sell an oil charge that
looks like a black tube, you screw it onto a convenient port and crank it
down with a rachet, when you crank it down the oil gets pushed into a
pressurized system.

If you've read this far ;-P, what you've done sounds fine and there
should be more than enough oil in the compressor.

BCNU,
http://www.geocities.com/cobramsri/

"Al Powell" <apowell at gocougs.wsu.edu> writes:

> I have replaced the AC system on a 1993 Audi 90 Quattro. I'm using a
> used-guaranteed compressor, and replacing dryer and orifice valve.
> The system has been vacuumed and flushed.

> My mistake is that the compressor didn't come with PAG oil in it and
> I didn't think of this until it had been mounted.  The Audi manual
> says that at least 2.7 oz of PAG oil must be in the compressor before
> charging, and the total charge is 8.5 oz.
>
> I have been adding oil to the compressor by pulling off the hoses
> and carefully adding oil from a squeeze bottle, but have only been able

> to add 1 oz...which is not enough to start it with.  What to do?
>
> Well, turns out that the configuration of this system is such that I
> can pour the remaining PAG oil into the hose which runs between the
> dryer and the compressor, and it would flow down to the compressor.
This hose
> is also the RETURN to the compressor after the refrigerant has gone
through
> the whole system. Therefore, the oil should be sucked into the
> compressor immediately on startup, as it's in the return path. Seems to
me that
> this would provide the needed lubrication.
>
> My question: would this work to lubricate the compressor, or do I
> need to pull it off and fully charge it with oil - much of which is
going to
> leak out while I mount it? I talked with an AC company today and they
> tell me it will be OK, so I'm going ahead with it.  Thought I'd share
it in
> case it helps anyone else.
>
> If it blows up, I'll let you all know.  I'm having the system
> charged tomorrow.

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