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A/C Charging

bbboomer on Mon July 20, 2009 2:46 PM User is offline

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?
Thanks,

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Darrell

mk378 on Mon July 20, 2009 3:20 PM User is offline

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.

daman on Mon July 20, 2009 4:19 PM User is offlineView users profile

I agree,fill with the factory amount of 134a, done.....

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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

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