93 F150 r134a Conversion - Need Help!
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Trailering
Joined: Aug 2021
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93 F150 r134a Conversion - Need Help!
Hey this is my first time posting here, but I need some HELP!
I have a 1993 F150 xlt with a 5.0L 302. I just completed my AC Conversion, but the AC is not blowing as cold as it should and my guage readings make no sense (this is my first attempt at AC work so I may just not know what I'm looking at...)
What I've done so far:
New AC Condenser from a 95 f150
New Low Pressure Line from 93 f150
New Compressor from 93 f150
(Came with 3oz pag oil, I added an additional 4oz)
New Dryer from a 95 f150
New Evaporator from a 93 f150
New High Pressure Line from a 95 f150
New Red Orifice tube I set a vacuum pump on the system to -30psi, I then shut off the pump and let it sit for an hour and no change in pressure (assuming that means no leaks). I then ran the vacuum pump for 45 mins to clear the system
I Added dye and 33oz of r134a
Now the ac blows cold-ish air, but not as cold as it should...here are my guage readings after replacing everything.
*Ambient temp under the hood (105f)*
After the system sat turned off for an hour and the truck turned off:
Low: needle was pinned max at 350+
High: 150
Truck on with AC on full blast:
Low: 50psi
High: 50psi
Right after turning the truck off:
Low:
I have a 1993 F150 xlt with a 5.0L 302. I just completed my AC Conversion, but the AC is not blowing as cold as it should and my guage readings make no sense (this is my first attempt at AC work so I may just not know what I'm looking at...)
What I've done so far:
New AC Condenser from a 95 f150
New Low Pressure Line from 93 f150
New Compressor from 93 f150
(Came with 3oz pag oil, I added an additional 4oz)
New Dryer from a 95 f150
New Evaporator from a 93 f150
New High Pressure Line from a 95 f150
New Red Orifice tube I set a vacuum pump on the system to -30psi, I then shut off the pump and let it sit for an hour and no change in pressure (assuming that means no leaks). I then ran the vacuum pump for 45 mins to clear the system
I Added dye and 33oz of r134a
Now the ac blows cold-ish air, but not as cold as it should...here are my guage readings after replacing everything.
*Ambient temp under the hood (105f)*
After the system sat turned off for an hour and the truck turned off:
Low: needle was pinned max at 350+
High: 150
Truck on with AC on full blast:
Low: 50psi
High: 50psi
Right after turning the truck off:
Low:
Last edited by MitchellB05; Aug 30, 2021 at 08:00 AM.
Laughing Gas
Joined: Oct 2014
Posts: 946
Likes: 186
From: Carnation, Wah
After the system sat turned off for an hour and the truck turned off:
Low: needle was pinned max at 350+
High: 150
Low: needle was pinned max at 350+
High: 150
The system should equalize after the truck sits for a little bit.
Easiest answer is that your gauges are way wrong.
Harder answer is that you have a plugged line/ valve in backward/ etc somewhere in there.
But that doesn't explain why your running pressures are so low...
t
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nflfreak43
1987 - 1996 F150 & Larger F-Series Trucks
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Jun 28, 2010 09:12 PM
