I don't think the make/model is important, but we have a 1998 Mazda
that we just love. I went to recharge the R134A refrigerant in my air conditioning system (I
don't think it
ever had a top-up since it was manufactured) but I
forgot to purge the line
from the kit I bought. I got air into the
system and it's running strange. If
I had done it right I would not
have had any issues, I'm certain.
tried bleeding some of it off then adding some a few times, and it
any better. A licensed A/C professional (he installed my
home A/C and heating
system) said that air can make the compressor
cycle on and off and when it's
on it can pull very hard on the engine
when the air gets to certain parts of
the system. So I decided to
remove the R134A and the air and start over.
I am not going to remove the compressor to drain and measure the
removed from it. If you knew how cramped the area is where
compressor is located you would understand why.
I now have an
evacuation pump that will pull a vacuum down to 75
microns (at sea level, I
guess), and a set of gauges. I am familiar
with the refrigeration cycle and
process, and have viewed some decent,
well-explained YouTube videos on how to
evacuate the system and
As far as I know, we have no
leaks. I should know for sure after I see
that the vacuum holds for 1/2 to 1
hour after I shut the valves and
remove the pump.
Assuming that I
don't have any leaks, I want to know if I should add
any PAG oil to the
system or not. I've read that the oil will
evaporate under vacuum. I've also
read that the oil will stay in the
compressor and lines.
I bought a 3
oz can of PAG oil that gets added through the gauge set
in case I need it.
The under hood sticker does not tell how much oil
to use, just the amount of
Can I safely assume that the oil is still in the system or
add some? Too much oil can be detrimental to the system.
guess what I really need to know from someone more experienced is if
evaporates with the refrigerant and any moisture in the system
shouldn't be any moisture in my system) when a vacuum is pulled
for 1/2 hour
If someone here knows whether I should add the 3 oz can and
it's not too much or if I should avoid adding any since I
opened the system nor am I aware of any leak, please let me know.
I don't need to know about the general procedure, how to use
reclaimer, etc., just some information about the oil. However,
open to any tips you might have.