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  1. #11
    Gold Member rdbigfarmboy's Avatar
    Join Date
    Jan 2005
    Collinwood, TN
    MF, Same,Zetor

    Default Re: AC works for about 30 minutes and then starts to fade(blow warmer) on Jd 3720

    Im going with overfilled freon. When all the parts heat up the expansion doesnt allow the referigerant to pass. T1P1V1=T2P2V2
    That thing has a lot of stuff all warming up the condensor evaporator assembly.

    When it was being initially charged it gets super cooler quicker if you put more than specified. Like say 2.5# instead of 2.2#. As long as you dont work the tractor it will stay cool. Like for cruising

  2. #12
    Super Star Member brin's Avatar
    Join Date
    Jul 2009
    Georgia - Mt. Vernon by The Store just 5 miles east and right by the big oak tree then to the creek.

    Default Re: AC works for about 30 minutes and then starts to fade(blow warmer) on Jd 3720

    My Jeep had the same problem...cold AC at first and then warm....just took it into the dealer this AM ...the AC condenser is clogged with fescue seed from me driving through the pasture before we cut and baled the and learn....Check your AC could be full of debris you are not seeing and it needs to be blown out from behind the I have found out....

    WORRYING does not take away tomorrow's TROUBLES, it takes away today's PEACE.

    NH - TC-29 , FEL, Bush hog, Bush hog brand finishing mower, Post hole digger, 6' Back blade, sub-soiler, Pallet forks, 20KW PTO Generator , 21 hp Murray Mower
    JD -3020 with FEL and a 16 HP. K-Grow Lawn Tractor (bought from K Mart 1994) and runs great !
    Clark 130 EN Mig Welder

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