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AC reading 65lbs low side port, engine off.

posted by  chris herbst on  Mon Jul 14 16:51 CST 2003
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last visit: Mon Oct 20 20:32 CST 2014
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A couple of problems with that -- first, the outside temperature is in the low sixties F, which means that the system is barely working. That contributes to short cycle time. The pressures will look a lot different with the air temp at 90.

Second, static pressure isn't a good gauge of charge. The only useful pressure is really the high side (with a low side reading also).

Third, the low side-only reading, is not accurate in diagnosing the charge level, since the low side will respond directly to the cabin air temperature. Unless the system is almost empty and barely cycles on at all, the low side reading doesn't do a whole lot. Unfortunately Volvo and a lot of other automakers, stopped putting high side ports in their A/C systems. They've gone to charge-by-weight systems, which are fine unless they're the type that fizz refrigerant from evaporators. Or any other place.

It COULD be low on charge, but there is not much way of telling until you can measure vent temp and see what the output is in higher ambient temperatures.
--
Chris Herbst, near Chicago.






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