EPU Freon

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by joseph1853, Jul 6, 2021.

  1. joseph1853

    joseph1853 Heavy Load Member

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    Just bought a 2016 Cascadia with a smart epu on it. Guys I bought it from had to do some work on it to get it to blow. Something to do with the fan not getting power. Anyways they said it doesn't cool very well and probably needs some freon. Apparently that not something this particular dealership does so I will need to figure out how to do it. So where's the nipple for the freon charge? I noticed one on the backside of the cab about 4 feet below the condenser unit but my freon connection deal did not fit on it so I'm assuming that's the low-pressure side and that there's a high-pressure side somewhere that is where I will need to connect my freon deal too. Were's is this located? I've looked everywhere and have not been able to find it. Thanks in advance.
     
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  3. dibstr

    dibstr Road Train Member

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    With all due respect after reading your post either take it to another shop or enlist a knowledgeable friend for instruction. In the mean time do not connect your freon deal to the high pressure port and open the valve on the freon container.
     
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  4. joseph1853

    joseph1853 Heavy Load Member

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    Ok, I'll do that but in the mean time could you explain to me how it would be done properly?
     
  5. dibstr

    dibstr Road Train Member

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    First off I would do nothing until I knew exactly what was going on. Second if you have one of those single hoses with possibly a gauge on it it will not tell you what is going on. It will only hook to the correct fitting which is the suction/low pressure. If you just have to charge it without evaluating (And I discourage this) add Freon until you get a good sweat on the LP line. If you have a manifold set, do not open the red valve with the Freon attached and valve open when compressor is running…on second thought don’t open it ever. If you are getting good sweat now it likely doesn’t need Freon.
     
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  6. joseph1853

    joseph1853 Heavy Load Member

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    Haha, yeah that's what I have one of those single hose deals with a gauge on it. Say's if it's in the blue area it has enough freon lol.

    I figured I'd hook it up and see where the gauge goes and get an idea of whether or not it's low.

    I know there probably inaccurate and cheap but it's worked on several occasions for me. That was on cars though.

    I understand that they have specific capacity requirements and thus it is possible to overfill the system and cause damage to the compressor or at the least premature failure.

    Still don't know where the lp line connection is.

    I know should probably invest in some proper ac gauges. I think they have them at harbor freight for a decent price.
     
  7. skallagrime

    skallagrime Road Train Member

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    Experiment with the right tools and research the system on a car before you mess with your semi

    Also, if that port isnt the right size for your hose, it may be because it takes a different refrigerant.
     
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  8. joseph1853

    joseph1853 Heavy Load Member

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    Ok, Thanks.
     
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