Automotive Air Conditioning Information Forum (Archives)

edahall on Sat July 23, 2011 1:22 PM

Year: 1990
Make: Dodge
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.

edahall on Sat July 23, 2011 2:03 PM

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.

JJM on Sun July 24, 2011 12:12 AM

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?

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com

edahall on Mon July 25, 2011 12:04 PM

Quote
Originally posted by: JJM
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?



Joe



When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com


The rebuilt compressor came with the vehicle when I bought it. The previous owner bought it but had not installed it. It came from Autozone and the compressor had a nice coat of fresh paint on it. Unfortunately, even though it looked nice, it did not work. So I ended up robbing the clutch / coil assembly from the rebuilt compressor and putting it on the old compressor. It is all working very well now.

I'm very glad to know that this site sells high quality products and next time I need an A/C component, I'll know exactly where to go.

JJM on Mon July 25, 2011 11:31 PM

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.

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com