AC Charging
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Junior User
Joined: May 2015
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AC Charging
My 1990 f 150 had no AC since I got the truck. Mechanics said $200 - $400 to change to R134
And replace high pressure lines. Compressor seems to work ok. I had a crazy idea of finding a nameless refrigerant on the Internet and charging it myself to see if it might just need to be charged. I attempted to vacuum out system and added charge and it actually blows cold air now😀 my fuse blew since it was a 15 amp should be 30amp but all went as was supposed to as soon as I started filling system compressor engaged. Is it normal for the compressor to go off and on often it should it stay on longer if Ac is on full?
And replace high pressure lines. Compressor seems to work ok. I had a crazy idea of finding a nameless refrigerant on the Internet and charging it myself to see if it might just need to be charged. I attempted to vacuum out system and added charge and it actually blows cold air now😀 my fuse blew since it was a 15 amp should be 30amp but all went as was supposed to as soon as I started filling system compressor engaged. Is it normal for the compressor to go off and on often it should it stay on longer if Ac is on full?
Lead Driver
Joined: Feb 2002
Posts: 7,961
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From: Greater Austin, Texas
Compressor should cycle quickly at first when charging but then stay on after system is full. It may cycle periodically if the fan is on low, but at high fan speed, which you should be on during charging, the compressor should not cycle if full.
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Thanks that really helps!
Posting Guru
Joined: Sep 2013
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Condensation is normal and that sound is normal as well.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
if all you did was changed the lines , pulled a vacuum , and added R134-A, plan on loosing everything within 1 years time. your 92 is supposed to use R-12 and by putting R134-A in it without doing a conversion it will self destruct in a short amount of time.
Junior User
Joined: Jul 2005
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From: moonshine va
Hmmm doing a conversion he will change dryer ,compressor and oriface tube and flush system so if it destructs in a year he did make it one more year
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No R134
Sorry for the confusion no conversion was made the system was recharged with R12
Thanks everyone
Thanks everyone
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Junior User
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r 12 and see if it works. And a couple weeks later it's still holding up.
Cargo Master
Joined: Jun 2010
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From: Iowa
Shush that talk and don't let my 89 Ranger hear such things! I recharged the system with 134A eight years ago and didn't change anything, just vacuumed and recharged with 134A.... I'm not recommending this but I can still run the fan on low and freeze myself out of the truck and only lose 1/4 can a year. I do have a spare bigger compressor pump sitting on my shop shelf anticipating it's failure and did have the part numbers for full the conversion but it's still blowing ice cold air.
i ain't rite
Joined: Mar 2005
Posts: 65,511
Likes: 5,567
From: Marlboro Mental Hospital.
the problem is not with compressor failure, the problem is that R134-A is not compatable with the oil used in the R-12 system, and it almost always turns to a black sludge crud that plugs up the orifice tube and other parts, causing the system to self destruct.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
X2.........
Not a fan of the R134a conversion unless you completely flush the system. And in most cases consider a later model condenser.
Not a fan of the R134a conversion unless you completely flush the system. And in most cases consider a later model condenser.