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Help! Bad New Compressor?

pf24 on Tue June 03, 2008 7:01 PM User is offline

Year: 1997
Make: Pontiac
Model: Bonneville
Engine Size: 3.8
Refrigerant Type: 134a
Ambient Temp: 55 F
Pressure Low: 65
Pressure High: 135
Country of Origin: United States

I am restoring air to a car that hasn't had working air in 2 years.


I installed a NEW Delpi-Harrison Compressor, accumulator, and orifice Tube. I backflushed the system with flush and clean. It held perfect vacuum for 1 hour.
Installed 8oz PAG-150 oil and 32oz R-134a and dye. Not cooling, LS 65 and steady, HS 135, Amb Temp 55 F.


I then recovered refrigerant and checked for a clogged orfice tube, it was perfectly clean. Checked for obstruction, everything flowing freely. recharged and tested with same result.

Is this a bad new Delphi-Harrison Compressor? Anything else I can do?


Thank you in advance for any info,
-Pete

Chick on Tue June 03, 2008 8:23 PM User is offlineView users profile

Low side to high, high side low..But 55 degrees is not the best for charging a system..Looks like a control valve issue though..Could be sticking.. Is that the sticker amount you put in?? (R134a)

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Wed June 04, 2008 9:44 AM User is offline

Your head pressure says it is pumping fine- just that you are at extremely low ambient to tell what it can do-- my guess is that it is fine- wait till it gets hot out and test- or put it in a heated garage-- I have tested good V-5 systems while driving at 65 mph- at 78 deg amb- and the head pressures are 120 or so-- so don't expect high head pressures when conditions don't warrant it-- plenty of air flow acrooss condenser means lower head pressures--

Now the low side pressure is fairly high- -- low side should range from 25-35 on a Variable pump.. the "not cooling" is due to the high low side pressure- which could very easily mean overcharge- 135psi is somewhat high for that ambient- again an indicator of overcharge--I would extarct the charge and introduce a little at a time and watch the low side- when low side is about 30 psi- I bet it cools--

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

pf24 on Wed June 04, 2008 10:28 AM User is offline

Thanks for the help.

I found that on the V5 compressor there is a control valve internal to the rear head, it must of been stuck. With it running, I did some blows to the rear lower of the compressor with a plastic hammer. The suction tube immediately got cold.

This was on a new compressor.

bobbyrae on Wed June 04, 2008 11:29 PM User is offline

Quote
Originally posted by: pf24
Thanks for the help.

I found that on the V5 compressor there is a control valve internal to the rear head, it must of been stuck. With it running, I did some blows to the rear lower of the compressor with a plastic hammer. The suction tube immediately got cold.

This was on a new compressor.

Wow! It sounds like you fixed your problem with a hammer! How trite. Have you checked the low and high side pressures after this? Just curious how much difference.

pf24 on Mon June 09, 2008 2:10 AM User is offline

I only retook low side readings,

At 75 ambient, low side was 45 PSI. Evap discharge air temp was 49 deg. Sound proper? Good enough for me.

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