Join Date: Feb 2006
Location: North Little Rock, Arkansas
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Under the hood of my truck (95 F250) on the lable on the core support it says 2lbs and 6 oz max charge. as Marc has already said. In my service manual is tell me that the charge is 2 lbs and 1 oz (+ or - 1 oz). I know this caused me some confusion when I was working on my truck. I was working with a totally evacuated system (Vaccum down and checked for 15 minutes).
I weighed in 2 lbs. and 2 oz's to allow for loss with the removal of gages) The system is working for over 16 months just fine. I check the center registers of the truck several times and during freeway driving have the temps running 38 for low and cycling to 44 on the high during the cycle.
Like the lable say's I think that is a max charge and the service manual is a mininum charge. I hope this was of some help. I made a pdf file of the page in the service manual but don't know how to attach it to this reply. There is a chart in the manual that deal with the pressures but it is temperature dependent. If the gages you are using have temperature on them you will see what I am Talking about the High side pressure will correspond with the condenser temp and the low pressure side will correspond with the evaperator temp. According to the service manual the Switch on the Accumulator/ Dryer is the low pressure switch or as the book calls it (A/C cycle switch) it bring the compressor clutch in at 23 psi on the lows side. I also cycles it off at between 40 and 47 psi on the low side (the cab is cool temp). I have a black truck and live in the South, and A/C is on the the list of thing I want to work Right. I hope this helps.
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