Vehicle in question is a 1999 Suburban LT 5.7 (last of the square old body style) with front & rear AC.
So some time ago the A/C compressor was replaced (due to the typical "belly leak") with a Delphi CS0120 along with a new drier/accumulator, and it was charged to the R134A amount that all service literature says: 4 LBS (1.81 KG). The system was still cooling very well with the old compressor.
The workshop that did the work was not able to replace the orifice tube ("we couldn't get the old one out" ) and the rear expansion valve. Not ideal but I figured since the old compressor still worked perfectly fine and didn't explode, it should be ok.
With the new compressor cooling output has been greatly reduced, at best it'll do around 50°F (10°C) at the outlets when it's close to 90°F (30°C) outside. Air temperature coming out front and back feels about the same. Before it felt like a fridge, now it's kinda so-so. I noticed that the old drier has a sticker on it saying that it should be charged with 3 LBS 8 OZ (1.588 KG), which is interesting because that contradicts with the GM manual and all info on the internet.
The fan clutch is new and engages in hot weather when sitting in traffic, so that operates as it should.
Any opinions on why it has such weak AC performance?
So some time ago the A/C compressor was replaced (due to the typical "belly leak") with a Delphi CS0120 along with a new drier/accumulator, and it was charged to the R134A amount that all service literature says: 4 LBS (1.81 KG). The system was still cooling very well with the old compressor.
The workshop that did the work was not able to replace the orifice tube ("we couldn't get the old one out" ) and the rear expansion valve. Not ideal but I figured since the old compressor still worked perfectly fine and didn't explode, it should be ok.
With the new compressor cooling output has been greatly reduced, at best it'll do around 50°F (10°C) at the outlets when it's close to 90°F (30°C) outside. Air temperature coming out front and back feels about the same. Before it felt like a fridge, now it's kinda so-so. I noticed that the old drier has a sticker on it saying that it should be charged with 3 LBS 8 OZ (1.588 KG), which is interesting because that contradicts with the GM manual and all info on the internet.
The fan clutch is new and engages in hot weather when sitting in traffic, so that operates as it should.
Any opinions on why it has such weak AC performance?
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