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  1. #11
    Platinum Member pjbci's Avatar
    Join Date
    Feb 2012
    Posts
    712
    Location
    Summit. Ms
    Tractor
    JD 4840, 450j, 310, komatsu D31px22, IH 1486, MF 135, MHF TO35

    Default

    Only other thing i can think of is we had a 1486 ih that would freeze up even with a clean evaporator unless we ran the blower on high all the time.

  2. #12
    Bronze Member
    Join Date
    Apr 2011
    Posts
    94
    Tractor
    X748

    Default

    If it has a small tube going into the evaporater, your system has a temp control switch and it probably has failed . This turns off your compressor momentarily so the evaporater doesn't freeze up.you can turn it off manually for a minute every couple minutes, and if it continues to blow cold then, you've found your problem.

  3. #13
    Bronze Member
    Join Date
    Apr 2011
    Posts
    94
    Tractor
    X748

    Default

    I re-read your initial post, you could also have a blower fan motor beginning to fail also, slowing down when it gets hot and not moving air. Hard to tell without being there

  4. #14
    New Member
    Join Date
    Aug 2005
    Posts
    21

    Default

    Quote Originally Posted by r8nger View Post
    I re-read your initial post, you could also have a blower fan motor beginning to fail also, slowing down when it gets hot and not moving air. Hard to tell without being there
    I have reassessed the problem. It does not appear to be a problem with the fan.

  5. #15
    Bronze Member Utah Bison's Avatar
    Join Date
    Mar 2013
    Posts
    57
    Location
    Utah
    Tractor
    S650G Bison Ferguson TO30

    Default Re: air conditioning problem

    With gauges hooked up on both high (discharge) service and the low (suction port) measure the pressure during failure. Could be as stated thermal or pressure cycling switch failure. Or high pressure shut off due to low air flow through the condencer. If the the radiator is plugged with dust can cause excessive high pressure and shut down the A/C.
    Some other thoughts.

    Lee

  6. #16
    Veteran Member banjodunn's Avatar
    Join Date
    Jun 2008
    Posts
    1,276
    Location
    Oz

    Default Re: air conditioning problem

    G'day low pressure should be approx. 10% of high or lower I would aim for a high pressure reading of 175-185psi on a 25c day on the high side this pressure can be used with R134a and Hychill ( Hydrocarbon based gas) I'm sorry but I can't remember if this is the same as R12 but I think it maybe a little high


    Jon

  7. #17
    New Member
    Join Date
    Aug 2005
    Posts
    21

    Default

    Thanks to everyone who responded. The problem was low refrigerant.

  8. #18
    New Member
    Join Date
    Jul 2013
    Posts
    15
    Location
    leongatha,victoria
    Tractor
    new Holland tl80 new Holland t85 fiat 45-66

    Default Re: air conditioning problem

    Ever since the start new holland cab tractors have been notorious for bad air cons iv had an L65 and L85 and they were shockers for the air con I know many contractors with these problems with the new ones as well!!

  9. #19
    New Member
    Join Date
    Aug 2005
    Posts
    21

    Default

    Finally had time to take tractor back to dealer. Problem was thermostat. Repaired under warranty.

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