Posted by longmeadowfarm on July 23, 2018 at 12:07:12 from (24.29.81.155):
Re: Air conditioner problem
Tractor: New Holland T4.75 ( 2013 model year)
Given: Tractor has 1850 hours��give or take Air conditioner blows very cold air when initially starting up�and working Air conditioning system was checked for proper refrigerant levels and pressure..all OK per dealer All 4 air filters are clean and are cleaned regularly..per operators manual. All four air filters are original.. not changed as per 1200 hr service/replacement interval.�per operators manual.
Operation: Air conditioner starts out strong and over time the cold air becomes increasingly warmer until it stops blowing cold air. Air conditioner air flow seems to degrade, along with blowing warmer air. I shut the compressor off and turn the blower up a notch� this action results in an increasing flow of warm to very cold air for up to 3-5 minutes. It seems that air flow increases during this �compressor off� cycle The cycle of cold/warm/cold air changes from the number 2 to 3 fan setting. The cycle can be as short as 5-10 minutes in fan position 2 to perhaps a long as 20-25 minutes as was the case yesterday�.in fan position 3.
Additional info Aa acquaintance of mine told me it would seem to be an air flow problem and to check for a plugged evaporator or duct. As the evaporator and air duct system is �closed� I doubt it is an airflow problem associated with a dirty evaporator or a mouse nest in an air duct. BUt it just could be that my filters need changing..
Another friend said it might be a high pressure sensor that�s not turning the compressor off� .. resulting in evaporator �freezing up�.
The New Holland Dealer told me everything is ok� had the tractor in the shop for some repair work�. and then proceeded to insult me when I asked the service manager to diagnosis the problem that he couldn�t replicate. Said he wanted to �vacate� the system and put all new refrigerant back in� I asked why??? .. got some blank stares. I asked if replacing the high pressure sensor was intrusive.. as some systems have a check valve so as not to lose refrigerant .. et al.. as I said I wanted to do the job myself.. never got back to me.
I took my challenging problem to a Case/IH dealer as they sell the same tractor..just a different color. They looked over the written explanation I submitted and said something like I didn�t know what I was talking about�.and inferred that the system wouldn�t do that which I reported.
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