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,
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)
Freedoms just another word for nothing left to lose
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--
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......
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.
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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