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  1. #1
    Join Date
    Dec 2019
    Posts
    1
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    Cooling unit on fridge only making a whooshing sound.

    I am a DIY guy that has some car AC knowledge. No experience working on a system like this.

    I have a Northland Refrigerator only Fridge that had a leak in the evap core. The fridge is about 8 years old and lost its charge a few months ago. The cooling unit on it is like a subzero you can just lift it off the box and work on it on a shop bench. The system is R134a and has a 1/4 up compressor.

    When it lost its charge for the first time I installed high and low ports on the system, then added some dye and found a pinhole leak in the evap. I brazed the leak to fix it, pulled a vac on the system for a few days, recharged it by weight (7 oz) and it worked fine for about three months, then a new PIN hole in a different are showed up. I just ordered a new evap core and replaced it.

    When I was replacing the core I screwed up and had some compressor oil exit the system. I was able to scrape it up and measure it and believe I was fairly accurate. Prior to charging the system I added that amount of oil back in plus an extra 1/2 oz. The oil I used was PAG46

    Now the unit is running and cooling good for a few days but it makes a whooshing sound while it runs. The sound really seems to be coming from the evap, it is not a fan making it, when the compressor and fan kick out you can still hear the sound for about 30 seconds. It's almost like the refrigerant is making a boiling sound.

    What did I do wrong or what could the sound be? Would it help to record it and post?

    Also what would corrode the evap to create leaks?

    Thanks for any help!

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,324
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    https://hvac-talk.com/vbb/showthread...ad-these-rules

    2. Do-It-Yourself (DIY) - not here.

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