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hew holland tm190 ac

M

mark in boonville ny

Member
my aircondition works when it wants to but only for about 10 min or so it will blow ice cold then it will feel like the heater is on. usualy when you first run the tractor it will work but not always. i bought a can of freon from advance auto and i didnt even put any in it and the guage says theres 100 psi in the system already then i seen that the compressor isnt really kicking on. is 100 psi right for this or is that low for this system making the compressor not kick on or something or is my compressor shot.its an 06 tractor so i dont know how the compressor can be bad already. and it can get pretty brutal in the cab with 80+ degree wheather when the doors dont like to stay open well. please help.
 
Is that static pressure or the high side pressure? High side
pressure should run from 180 PSI to 225 PSI when running at
normal operating RPM. Low side from 20 to 30 PSI. Was
R134A added when the system was empty and open to the
air? If so you could have moisture in the system causing
erratic operation. Could also be a sticky expansion valve ( if
this model uses one).

One thing to try is to shut off the heater by turning a valve off
on the block or pinching the heater hose flat. The heater will
always win if it is stuck on.
 
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