Automotive Air Conditioning Information Forum (Archives)

wt9 on Sun August 05, 2012 11:12 PM

Year: 2004
Make: Cheverlot
Model: Silverado
Engine Size: 5.3
Refrigerant Type: 134a
Ambient Temp: 80F
Pressure Low: 44
Pressure High: 230
Country of Origin: United States

just finished diagnosing a problem and wanted to get advise on my pressures, additional info 87% RH, evap temp 60F. From what I have learned this seems slightly high. Is that a big deal or take away efficiency.
Thanks to the forum. I have not fixed it yet, but I have been chasing erratic behavior of my AC all summer. I finally got down to the clutch gap today. Tapped the front and it went to working. Typical symptoms, sometimes run for 5min, sometimes 30, sometimes reving engine worked, finally it quit completely.
From what I understand, I can pull the pulley and remove shims. no special tool needed.

GM Tech on Mon August 06, 2012 12:40 PM

Just posting your thoughts? and your question is? yes you are on right track....

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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......

wt9 on Sat August 11, 2012 5:15 PM

posted mostly for comment. trying to learn. my question was around refrigerant pressures. Are they higher than ideal? if so is it a big deal?

Edited: Sat August 11, 2012 at 5:24 PM by wt9

TRB on Sat August 11, 2012 6:17 PM

How much refrigerant is in the system?


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