Hi Larry,
Are you asking what a full charge of freon on an empty system would take? My 36 ft. coach takes 5 lbs of R134a Freon and 9.5 ounces of the SP 20 oil. If your only recharging the system the A/C tech will have to look at high and low pressure to determine how much freon you'll need.
You might try posting at the Yahoo Country Coach Owners group.
Bill
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2003 Country Coach Intrigue 36'
Cummins ISL 400
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