I want to service the a/c on my 2001 Ford Superduty.
The system has no sight glass so I plan to use gauges and the following procedure.
Begin with about 70% of the required charge.
Add in small increments until I achieve the lowest vent temps possible without exceeding the high/low range of the PT chart for a given ambient temp or the max required charge amount.
Are the vent temps okay for this or do I need to monitor the evaporator temp itself?
Is this correct or do I need to do something more or different?
If the system is stock, simply look up the manufacturer's specified charge. Often it is also found on a sticker under the hood. You may need to convert from metric to ounces. Start from a full vacuum and use that specified amount of R-134a.
They have already optimized the amount for you. Experimenting is only necessary if you are converting an old R-12 vehicle or building a custom system.
I agree,fill with the factory amount of 134a, done.....
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