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23 year Ranger veteran
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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 (
Last edited on Wed Jul 4th, 2018 05:32 pm by CBB9M
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-Bill
04 Ranger FX4 Level II, several mods