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#1
08-25-2021, 08:49 AM
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RPM for AC Charging
The W124 has a very slow AC leak. I add refrigerant once or twice a year and am happy to continue to do that.
My method has always to charge with AC on, max cool, max fan, and engine idling and then charge till the pressure is in the green range. However I noticed a few folks recently say that engine ought to be at 2000 rpm for charging. Poking my nose around I see a wide range of opinions. Happy for any insights anyone has. Perhaps engine speed doesn't matter a whole lot.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 77k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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