It is possible that there is too much freon in the system, thereby
not allowing proper evaporation (in the evaporator...where else?) to
occur. I'd put money on this one, seeing how the air was cool before,
and now it is less so.

It is pretty apparent that there is not too *little* freon, due to
the absence of bubbles.

There also may be too much oil in the system thereby displacing refrigerant.

You must really go by temperature and pressure tables for the a/c
system that are published by the manufacturer. An a/c system is a
fine balance between gas and liquid, pressure and temperature. Only
by looking at temperature vs pressure can you properly diagnose what
the trouble might be. All else is guesswork.

Good luck,
Dave

-=-=-=-

>After re-charging my R-12 system, I only have mid 50s air coming out of the
>vents.  That doesn't seem right.
>
>Here's what happened.  A few days a list user pointed out that an R-12
>system shouldn't have a lot of bubbles in the site glass.
>
>I went out to look at the one on my '87 Westfalia, and there were quite a
>few.  The AC has been cooling OK, but we haven't had any really warm temps
>out here, so I figured I would have a buddy of mine who is a refrigeration
>tech top it off before I leave on vacation (tomorrow).
>
>He did this in his spare time, so didn't really go through the system, but
>now the site glass is clear, no bubbles.
>
>We were hoping to get ~45 degrees out of the center vents, which is what I
>was getting last time I had it charged, about 18 months ago.
>
>He lent me a thermometer to check while driving around, but the best I got
>was 54.  It feels pretty cool coming out of the vents, but the van, which
>had been sitting out in the hot sun all day, hadn't cooled off after about
>half an hour of running.

--
Dave Carpenter

Whatever you wish for me,
May you have twice as much.