New AC compressor making noise

[gmdrvr]

I rebuilt my AC system with a new compressor, new main line, new condenser, new O/T and new accumulator. I flushed the evaporator and left the rear ac alone. After I put it all together I vacuum tested the system and let it sit with a vacuum for an hour and it held. I put the recommended oil and refrigerant in, the low and high pressures are correct and the AC is blowing at 39 degrees.

When I went to take the truck for a drive there was a fast clicking noise at idle under the glove box in the evaporator area.The noise would stop when the compressor turned off. The clicking sounds like the pistons in the compressor and it goes to a higher pitch while accelerating, makes a buzz noise (like a transmission stuck in low gear) then it just stops making noise when the compressor turns off. Under the hood I don't hear it, only inside the vehicle with the doors shut.

Any ideas? Is it a bad compressor or is there like a break in period?

 

[SunlitComet]

is it possibly the recirc motor?

 

[gmdrvr]

No because the noise quits every time the compressor stops, even with the blower still on.
The noise also changes pitch with the engine RPMs.

 

[SunlitComet]

does your line on top rear of compressor have the muffler on it?

 

[gmdrvr]

Yes the low side coming to the compressor has a muffler and the high side leaving the compressor also has one.

 

[SunlitComet]

hmm, possibly overcharged making the compressor struggle then. have you done a performance test on it yet?

 

[gmdrvr]

have you done a performance test on it yet?

The performance test checks out, I have 42 on the low side and 200 on the high side and 39 degrees at the vent.
Do you think the noise could have something to do with the accumulator? I asked for all the parts that go with a Yukon with rear AC but the accum. was a little shorter and more tapered at the bottom than the original one. Would an accum. for a non rear AC system even fit on rear AC system?

 

[SunlitComet]

the accumulators are different. did you put the wrong one in?

 

[SunlitComet]

can you get an audio recording of the sound please?

 

[gmdrvr]

The part number for the accumulator is Everco 4539N and/or 33219. I asked twice to make sure it was for systems with rear AC and he said yes, but who knows.

I will try and get a recording of it if that IS the right accumulator.



Edit: I found the sound already posted on youtube, it is from a Mini, apparently a good number of Minis have this problem