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360 A/C Questions

Discussion in 'Technical Q&A' started by targa81, May 8, 2012.

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  1. targa81

    targa81 Karting

    Sep 28, 2009
    116
    #1 targa81, May 8, 2012
    My A/C wasn't blowing cold and compressor wasn't coming on at all so I charged a can of R134. Now compressor comes on and cold air coming out but high pressure lines intermittently vibrating such that vibration felt through battery cover. The vibration is just the high press. Line, not receiver/dryer.Guages indicate low side 50/high 150 with not much variation. When I tightened the high pressure port of the manifold guage the vibration stopped. Anyone have any thoughts before I submit to experts /dealer with open wallet?
     
  2. targa81

    targa81 Karting

    Sep 28, 2009
    116
    #2 targa81, May 8, 2012
    Definitely high pressure line vibration and now compressor short cycling. Anyone any ideas?
     
  3. Deanh

    Deanh Rookie

    Jul 3, 2010
    6
    #3 Deanh, May 9, 2012
    A short cycling compressor usually indicates too much Freon in the system. The compressor can't stay on very long because it will build up too much pressure.
     
  4. targa81

    targa81 Karting

    Sep 28, 2009
    116
    #4 targa81, May 12, 2012
    You may have been right although I was worried something more complex was going on. I evacuated the system, pulled a vacuum and recharged. Now have cold air without vibration or short cycling but we"ll see if that does it...
     
  5. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,234
    Mount Isa, Australia
    Full Name:
    Pap
    #5 PAP 348, May 12, 2012
    Hi mate,

    Well done, that will fix it.

    You had air in the system, that can cause the high pressure gauge/hoses to "shake" violently (hard to explain over the internet, but yeah).

    Have seen it many times and the only fix is to recover the gas, vac down and recharge.

    Which is the only way to service and repair a/c systems properly anyway. ;)
     
  6. targa81

    targa81 Karting

    Sep 28, 2009
    116
    #6 targa81, May 12, 2012
    Thanks Pap. I was hoping that's all it was. When I had my local shop hook up their machine was getting weird pressures, high suction and low high side so was worried there was some blockage or my compressor was toast.
     
  7. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #7 netman, May 13, 2012
    I think you still have an issue as the air was able to enter the system. Did you do a leak down test after evacuating the system?
     
  8. targa81

    targa81 Karting

    Sep 28, 2009
    116
    #8 targa81, May 13, 2012
    Pulled a vacuum for an hour , no evidence of major leak as the vacuum held no problem. I guess there could still be small leak though, didn't use dye so hopefully she stays cold. The vibration and short cycling is gone which was my bigger worry.
     

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