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Joined: Fri Nov 10th, 2017
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I tend to take a backseat on AC service in forums, but I'll throw out a few pointers to get you headed in the right direction.....
a) Verify there are no obstructions to airflow across the condenser (bugs, etc) and evap coils (mud, etc).
b) Verify that blend door closes off airflow across heater core.
c) Look for traces of refrigerant oil at each connection in the AC system. This includes around the front of the compressor since it has a shaft seal.
d) Hook up a gauge set, ie, a gauge on the suction side and one on the discharge side, and with the AC on + fan on high, engine held at 1300-1500rpm and ideally an ambient temp of 80+ degrees, note the pressures with the system at steady state and over a brief time. You watch over time for variations because this could be useful in the diagnostics.
The numeric pressures at system steady-state are important and this "upper 3/4 of the green area of the gauge" is totally worthless as it does not specifically quantify (
Flow is not an issue. Blend door works as designed. I see no trace of oil/grime at any of the AC connections. The gauge I have shows that I am about 45 psi on the high side with it being 88 degrees outside - it is a cheap gauge. Once I am up to speed and 10 minutes down the road it is blowing 41 degrees from the center console. It drops off 5-7 degrees on the outer vents.
I am thinking that the compressor might be going south but it will work fine at speed. At idle it does seem to struggle keeping up. I have a temp gauge in the center console to let me know what is going on right now.
____________________
Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement