Freon Capacity?
Oct 18, 2011 | 01:23 PM
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Cross-Country
Joined: Apr 2009
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From: Fort Smith Arkansas
Freon Capacity?
Anyone know the freon capacity on the a/c system for a 1981 F150 4x4 with a 351M & C6?
Oct 18, 2011 | 01:34 PM
Joined: Feb 2006
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From: Exmore, VA
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.
Oct 18, 2011 | 01:39 PM
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From: Mexia, TX
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.
Oct 18, 2011 | 04:10 PM
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I know they vary between Diesel and gas.
Oct 18, 2011 | 04:30 PM
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From: Mexia, TX
^ Thanks for the correction.
Oct 19, 2011 | 11:31 AM
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From: Whitehouse, Tx
Should be around 3 if it's completely empty
Oct 19, 2011 | 11:52 AM
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Truthfully I never worry about lbs. I just get the presure right and letter go.
Oct 19, 2011 | 11:55 AM
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From: Whitehouse, Tx
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Oct 19, 2011 | 12:04 PM
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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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