As you suggested I returned the cans and bought regular R134a cans.

Yes I did replace the dryer, but I could not find the expansion device.
This is a 1990 Geo Metro. It does not use an orifice, and I can't find
anything else on the low pressure line. I am guessing that the
expansion valve must be inside the evaporator. The only way to get at
it would be to remove the evaporator, which I am not ready to do. I
measured the exact amount of ester oil, and poured some into the
compressor and some into the condensor. I sealed it up and ran a vacuum
pump for 2 hours. The vacuum stayed at 30"Hg for more than six hours
after the pump was turned off. I am about to recharge the system today.
I will let you know the outcome.






Steve B. wrote:
> On 17 Jul 2005 10:23:19 -0700, wrote:
>
> >I flushed the entire system, and installed a brand new compressor. The
> >Haynes manual says I should pour 2oz of oil each into the evaporator
> >and condensor before evacuating the system. However, my R134a bottle
> >says that it has oil already mixed in it. My question is, should I add
> >this oil, or should I assume that the oil in the refrigirent is enough?
> >I assume that I still need to pour some oil into the compressor ports
> >to keep it lubricated during startup.
>
> You also are going to replace the dryer and expansion device aren't
> you?
>
> You need to take back the cans with the oil already added and get
> regular ol' 134a in a can. Make sure the compressor manufacturer did
> not already put oil in the comrpessor as well.
>
> Find out how much oil your system takes and add the oil back before
> you seal the system up. I do like to spread it across the system like
> the book says to avoid slugging the compressor with oil.
>
> Having the proper oil level in the system is critical to compressor
> life and system performance. Make sure you have exactly the right
> amount!
>
> Steve B.