Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

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?


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.....

'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)

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.