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AC and Fan Clutch question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by dennist, May 1, 2012.

  1. May 1, 2012 #1
    dennist

    dennist Bobtail Member

    9
    1
    May 1, 2012
    Fort Wayne
    0
    AC is charged up on my Detroit in the Western Star. Now when it gets over 85 or so the fan clutch cycles way too often. No heating up of the water temp, it cycles way to much. Anybody got a clue?

    Thanks.
     
    dennist, May 1, 2012
    dennist, May 1, 2012
    #1
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  3. May 1, 2012 #2
    bender

    bender Road Train Member

    2,105
    1,360
    Jul 20, 2010
    Don't Kid Yourself
    0
    Does this happen only with the AC on?
     
    bender, May 1, 2012
    bender, May 1, 2012
    #2
  4. May 1, 2012 #3
    dennist

    dennist Bobtail Member

    9
    1
    May 1, 2012
    Fort Wayne
    0
    Yes only with the ac on and only when it gets over 85 or so the fan clutch will cycle way too often.
     
    dennist, May 1, 2012
    dennist, May 1, 2012
    #3
  5. May 1, 2012 #4
    bender

    bender Road Train Member

    2,105
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    Jul 20, 2010
    Don't Kid Yourself
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    Your high side pressure running too high will cause this. Check for overcharge of refrigerant, Monitor pressures with gauges at a high idle. Too much pressure in the high side kicks the fan on whether it needs it or not.
     
    bender, May 1, 2012
    bender, May 1, 2012
    #4
  7. May 1, 2012 #5
    dennist

    dennist Bobtail Member

    9
    1
    May 1, 2012
    Fort Wayne
    0
    What should the pressure be high and low side. I can hook em up in the morning!

    Thanks
     
    dennist, May 1, 2012
    dennist, May 1, 2012
    #5
  8. May 1, 2012 #6
    bender

    bender Road Train Member

    2,105
    1,360
    Jul 20, 2010
    Don't Kid Yourself
    0
    Your pressures will vary with ambient temp but generally 30 low, 225 high. Was the refrigerant put into the system the called for amount per specs?
     
    bender, May 1, 2012
    bender, May 1, 2012
    #6
  9. May 1, 2012 #7
    Mr. Truck Fixer

    Mr. Truck Fixer Bobtail Member

    46
    13
    Jan 27, 2012
    Ontario
    0
    Check the condensor core, sounds like it's separating from the tubes.
     
    Mr. Truck Fixer, May 1, 2012
    Mr. Truck Fixer, May 1, 2012
    #7
    Heavyd Thanks this.
  10. May 1, 2012 #8
    blanco

    blanco Road Train Member

    1,221
    296
    Nov 20, 2009
    Gwinnett County, GA
    0
    clean the condenser, it could be clogged up and not bringing the temp down as needed, causing it to work overtime.
     
    blanco, May 1, 2012
    blanco, May 1, 2012
    #8
  11. May 2, 2012 #9
    dennist

    dennist Bobtail Member

    9
    1
    May 1, 2012
    Fort Wayne
    0
    I will go hook up the gauges and determine if the pressure is high. Also will blow out from the engine side. Thanks again!
     
    dennist, May 2, 2012
    dennist, May 2, 2012
    #9
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