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  1. #1
    Join Date
    Feb 2004
    Location
    Midwest
    Posts
    9,932
    Just got a used spare refrig. to keep in garage. When it shuts off, the compressor makes a loud double clunk. What causes this?


  2. #2
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    Death rattle.

  3. #3
    Join Date
    May 2000
    Location
    Colorado flatland native
    Posts
    15,067

    The squirrels run into each other pretty hard

    when the brake hits that wheel they're running on. My shop fridge does it too.
    My doctor gave me six months to live, but when I couldn't pay the bill he gave me six months more.
    Walter Matthau

  4. #4
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,292
    High head pressure? How clean are the condenser coils?
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  5. #5
    Join Date
    Feb 2004
    Location
    Western New York
    Posts
    1,042
    As you know, the motor/compressor is spring-mounted inside the can. If one of the springs is weak or broken, the compressor will shift when it shuts off, hitting the wall on the tin can.

    Similar to when you are installing a replacement tin can, and you give it several violent shakes to activate the magic. Same sound.
    Experience is what you have an hour after you need it.

  6. #6
    Join Date
    Jul 2003
    Posts
    2,407
    baub beat me to it. The springs under the compressor are going bad. If they are not gone too far you can sometimes put cardboard under the bad area and it will deaden the noise a little. Most of the time this is not a problem, especially if it is a garage unit.

  7. #7
    Join Date
    Feb 2004
    Location
    Midwest
    Posts
    9,932
    Thanks guys. Yeah that's the sound all right.

  8. #8
    Join Date
    Dec 2001
    Location
    Ocean Pines, MD
    Posts
    6,959

    Not necessarily the death nell.

    Have one that has been doing that for years. Knocks but never misses a beat.

  9. #9
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,150
    My beer fridge in the garage was making that noise...unplugged it...electric bill dropped $15 a month...beer stays in the house now!

  10. #10
    Join Date
    Feb 2004
    Location
    Midwest
    Posts
    9,932
    Originally posted by jrbenny
    My beer fridge in the garage was making that noise...unplugged it...electric bill dropped $15 a month...beer stays in the house now!
    Til you drank it

  11. #11
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,345
    check to see if the compressor is mounted on springs or rubber motor mounts.

    a while back i was helping a neighbor move a very old fridge (1950's prbably) in his basement and the compressor kind of fell out the bottom when we put it on the hand cart. turns out that the spring mounts had completely rusted off the compressor (big @$$ Kelivinator beast of a compressor). We bolted it back in with new springs and he couldn't believe how quiet it was. he said it always used to rattle and klunk, but now it is silent. we also fixed the condensor fan which looked like it hadn't turned in 10 years. i doubt a modern compressor would last that long without a condensor fan. I don't want to even think about the head pressure

  12. #12
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,150
    Originally posted by midhvac
    Originally posted by jrbenny
    My beer fridge in the garage was making that noise...unplugged it...electric bill dropped $15 a month...beer stays in the house now!
    Til you drank it
    Ya, beer doesn't last as long when I don't have to walk to the garage for a cold one!

  13. #13
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    Originally posted by workhorse
    baub beat me to it. The springs under the compressor are going bad. If they are not gone too far you can sometimes put cardboard under the bad area and it will deaden the noise a little. Most of the time this is not a problem, especially if it is a garage unit.
    baub was referring to the springs inside the can. Compressors have springs mounted internaly also.
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
    "Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twain
    http://www.campbellmechanical.com

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