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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old 10-18-2011, 01:23 PM
cgi2099 cgi2099 is offline
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Freon Capacity?

Anyone know the freon capacity on the a/c system for a 1981 F150 4x4 with a 351M & C6?
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Old 10-18-2011, 01:34 PM
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william.a.vose
It may be gone, but there should have been a sticker on the radiator support. Unfortunately, most of the computerised manuals only go back to 1983.
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Old 10-18-2011, 01:39 PM
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I wouldn't think that the AC systems varied in capacity based on engine size...

FWIW, my 81 F150 with a 302/C6, 2WD and factory AC has a sticker stating that it will hold 3lbs 12oz of R12. Not sure how much R134a it will need though.
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Old 10-18-2011, 04:10 PM
Herb Brooks Herb Brooks is offline
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I know they vary between Diesel and gas.
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Old 10-18-2011, 04:30 PM
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^ Thanks for the correction.
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Old 10-19-2011, 11:31 AM
Tknight85 Tknight85 is offline
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Should be around 3 if it's completely empty
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Old 10-19-2011, 11:52 AM
Herb Brooks Herb Brooks is offline
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Truthfully I never worry about lbs. I just get the presure right and letter go.
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Old 10-19-2011, 11:55 AM
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3 cans I meant
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Old 10-19-2011, 12:04 PM
Herb Brooks Herb Brooks is offline
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Understood. Also if the system is dry pull a vacuum on it for at least 30 minutes and the first thing in should be a can of oil charge. I assume you know how the freon got out and have repaired the leaks. new orifice tube etc..
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Old 10-19-2011, 12:04 PM
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