to the experts:
A few months ago I switched my wife's Astro 4.3L van to 134. New parts:
(rebuilt) compressor (reman), accumulator, orifice tube/filter, and new "O"
rings throughout. I pulled a 28psi vacuum, added 8.5oz oil, and 2 1/2 12oz cans
of 134a. The compressor keep cycling until I got to the last can when it stayed
on all the time (fan on high, lever on max). Air temp at the vents was approx.
The system ran great until last week when she told me that it wasn't working
The air is blowing warm. It was low on 134a, around 20 psi suction, but not
empty. The discharge line was hot, and the suction line is warm. There was a
very slow leak at the pressure switch. I replaced it.
Not knowing if anything else was wrong, I decided to flush the evap and
condenser. They both blow air freely. I also emptied the accumulator. The oil
Now here is the baffling part: I drew a vacuum and add 8.5 oz can of oil. I add
the first can of 134a and the compressor is now engaged without cycling.
Suction pressure is already 30psi, discharge about 180. I add part of the
second can and suction went to 50 and discharge 230. I stopped adding. The
discharge line is now hot and the suction line to the accum is warm. The
compressor is starting to make noise, I guess due to the high pressure. Air at
the vents is still warm.
What could be causing this?
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