This is a dual a/c system with 60 oz capacity. Vacuumed it for 2 hours and charged from a heated drum. After taking in 28 oz, it wouldn't take any more even when reving the engine. Gauges were in the 35-40 and 150-175 range. Air is blowing cold but why can't I put in a full charge? The tank weighs about 14 pounds. Shouldn't that be enough for good flow? Charging with tank upright as a gas.
Can't add a full charge of R134A to 2003 Ford E150
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Yes of course.
Are there two separate places to add it, or just the one? 
If the air blows cold, it should be good
If the air blows cold, it should be good
High and low side of course, but only add from the low.
That's kinda like sayin, if my engine runs, but is 2 1/2 quarts low on oil, it should be good.If the air blows cold, it should be good
You’re raising the RPM while you’re introducing the refrigerant, correct? Is it a warm day? For the most part you should be able to put in an abitrary amount of refrigerant until there is liquid in the low side (not what you want to do but just commenting on the amount).
Just a guess, but is the rear cooling system blowing cold after you charged it and it is running? Sometimes, with an older vehicle, someone may have blocked off the back system instead of replacing a leaking evaporator. It is a cheap easy fix that some do if the rear system is not really needed, but after that the total system capacity will be less.
I will take a closer look but only saw one.I meant, are there two low side ports and two high side ports on that dual system?
This has happened to you before, how did you resolve it then?
2015 Ford Explorer Police a/c wont take full charge
A/C was working just not very cold. Thinking it might be low or freon, I vacuumed the system for 2 hours, then charged from a half full tank. Sticker says it takes 26 oz but could only get 16 oz in before it wouldn't take any more. Next day I try to add another 10 oz but near the end, the high...
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If I remember, I blew out a lot of dust on the condenser and sprayed on a foaming cleaner, then hosed it off.
