Model: D250 Cummins
Engine Size: 5.9
Refrigerant Type: R134a
Ambient Temp: 100
Pressure Low: MAX
Country of Origin: United States
I replaced my compressor with a rebuilt A/C compressor because the coil went out on the old one. It seems like the compressor is not pumping. The low side readings are maxed out and if I rev the engine to 2500 rpm, it'll bring the low side down to maybe 30 on the R134a scale (about 3/4 the way up the scale). It also won't take any more refrigerant yet I've only put in less than half of what I need. What's going on? Does it sound like a defective pump.
I should also mention that the pump turns over just fine but the low pressure line is not getting cold. And yes, I did pull a vacuum on the system before recharging.
Update: I dropped all the refrigerant from the system, started the engine, set a/c to cool, jumpered the low pressure switch and watched the lowside gauge. With the compressor turning, not only did it not pull any vacuum but I didn't even notice a blip on the gauge.
What make was the rebuild? Where was it sourced?
Sounds like typical performance (or lack thereof) from a rebuilt part if other than from the site sponsor.
Any way you can get your old one back and just replace the clutch?
Now that's a good use for an Autozone compressor! You're lucky you got one with even a clutch that worked.
Good you still had the old compressor... you probably would've made a bunch of trips back and forth to Autozone, and worse, got one that ended up seizing, damaging your entire system.
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