Engine Size: 2.2L
Refrigerant Type: 134A
Ambient Temp: 60
Pressure Low: 73
Pressure High: 73
Country of Origin: United States
2003 Chevy S10 with 2.2 liter engine Compressor is engaged but no cooling
ambient temperature = 60 degrees. Static pressure reading Low Side = 68 psi High Side = 75 psi. With engine running and AC on max pressure reading Low Side = 73 psi and High Side = 73 psi.
What does the pressure reading tell me that might be the problem? I know there is refrigerant otherwise the compressor would not engage so I know the system is not empty but with the high side and low side at equal pressure. Also there are no indications of any leaks. System has dye in it and there are no traces of dye anywhere. Could it be a broken orifice tube? Any recommendations for any further testing? Any advice is appreciated.
If it truly has the correct charge. Might look at replacing the control valve.
Just because there is pressure in it does not mean the correct amount of refrigerant is in it. The readings you have could indicate as little as 5 ounces left- Your system needs about 30 ounces as I recall.. Make sure the refrigerant amount is correct- the worst thing you can do to those V-7 compressors is to run low on charge.
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 tip. I looked at the number on my compressor and it was Delphi #15765204 which when I looked that up I found that it is the number for a V7 compressor. Are the valves the same for a V5 and a V7 or is there one that is specific for the V7? Also, I used a mirror to look at the underside of the compressor so I could see the valve and it was purple.
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