Engine Size: 3.8L
Refrigerant Type: R134A
Ambient Temp: 80F
Pressure Low: 20-45psi
Pressure High: 140psi
Country of Origin: United States
A/C wasn't working and the pulley was going bad on the compressor so I decided to try and fix the system.
I replaced the compressor the A/C hose assembly, and the drier/accumulator. I was going to replace the FOT with a smart VOV but the access point
was too seized to get access to and I didn't want to replace the entire line. I took it to a shop to have them charge service the system. They vacuumed
it down and said it didn't leak and then put 2.5lbs of R134A in. Once it was filled they called me and said that it still wasn't working, the compressor wasn't kicking
on. The tech put 12v to the compressor to engage the clutch but said it still didn't cool and that is where I'm at now. I hooked my own gauges up to it this afternoon
80 F outside and the wife had been driving it so it was plenty warm in the engine compartment. The high side read 140psi and the low side would slowly rise to 43psi
the compressor would kick on for a few seconds and the low side would drop to 20psi and start rising again. What say the A/C gurus?
Was this a brand new compressor, rebuilt or wrecking yard?
From the data provided it sounds low on refrigerant. You calim they put in 40 ounces. Mitchell calls for 45 ounces.
You betcha! Pressure readings at that ambient and short cycling points in the direction of a low charge... one of my references even shows 46 oz.
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