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new holland tm190 air conditioning

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.
 
100 psi may be good if ambient is 100. Might be overcharged a bit. If cool once it should be good to go. Don't put any more in.

Is the condenser and evaporator clean clean!!

If they are dirty, a high pressure switch could be kicking the compressor out.

Could hot wire the compressor, but might ruin it!
 
That might be a good idea to clean it since its been a while. Ya i didnt pit any in it but ill see if it needs a good cleaning because im sure it does. Seems like it worked fine before we started discing with it.
 
I would bet that the condenser coil is plugged with dirt/dust/chaff. The compressor is pumping up but the high pressure switch is kicking it off.

Also check the cab filters and the evaporator too. When it is 90 degrees out everything needs to be clean for the system to have a prayer to work.

Too many chore/utility tractors NEVER get cleaned out until they quit working.

Every year before real hot weather I clean everything up and check the freon pressures on the cab tractors. It is amazing the amount of dirt/crap they can have in them.
 
Hello Mark in Boonville ny,

What is the refrigerant you have in the system?
100LB on the high side? It does sound as if the refrigerant is low, but like jd said check for air restriction. Radiator fan running and condenser and evaporator clean? Also check and see if heat is going into the heater core. Check for a clogged drain also.

Guido.
 
I would bet that he checked the low side as he said he went to fill it. He should have been on the low side to add any freon.

Those self fill cans with a gauge cause as many problems as they solve. Too many guys never check anything else and just throw some more freon in a full system. I get a few locked up compressors each year because of over filling. Most times the condenser and evaporator are completely plugged but they throw freon at it because that is what the coffee shop guys tell them to do. Plus many fellows never change the cab filter until it is completely plugged and then they blow it half out an think it is as good as new.
 
It could be the expansion valve. That was the problem on Dad's Maxxum.

The pressure would build and the compressor would kick out.
 
Ok looks like i gotta check and clean every thing then cause most likly its never been done. And that is the original freon ive never filled it all i did was put the guage on it and thats what it read altho i have seized a pump up in a car at one time tho where are these filters and valves that should be cleaned located on it since i have never touched the ac on this and not sure where they are located. Thanks for the help so far.
 
Mark: The expansion valve is inside the system. You have to dump the freon to service/replace it. I do not think that is your issue. I am still betting that the air system is plugged up.

The condenser core is in front of the radiator. It needs to be clean so the air can flow through it. Also the radiator and hydraulic cooler need to be clean too. The air flows through the whole stack.

I know that the NH TM190 has cab filters as I have found them for sale on the Internet but I am not sure where they are located on the tractor. Your operators manual should tell you. If not call your local dealer.

You need to clean things first then see if anything is actually wrong. If you have never cleaned the filters and such I would bet that is your problem. Your tractor is relatively new so the freon should be OK.

Have you serviced the engine air filters??? May be the time to do a complete maintenance job on the tractor.
 
Refrigerant pressures are probably one of the most misunderstood readings we will come across or hear about. Few realize a fully charged system that is not turned on will read very close to ambient temp. In other words, 30 psi if it is 30 degrees out side or 100 psi if 100 degrees outside. Was more so with R12 than 134A but it is still close. Also, a half charged system that is operating will read very close to same pressures as a fully charged system. Need a basic understanding of refrigeration to interpret gauges.
 
Allan is exactly right . You have the temp set down low and the evaporator and cab filters are stopped up. You are not getting enough air flow thru the evaporator for the temp and you are freezing up. Pull the top and clean the evaporator and filters and NEVER run the fan on anything but wide open. Uses the temp setting to control the tem. you want. I with JD Seller first thing everybody wants to do is grab a can of Freon.
 
but like i said tho i have never touched any settings or what not on this tractor. Everything is the same as it came from factory. I have cleaned the cab filters everything else still needs to be checked
 
Hello JD Seller,

I know that MOST people should stay away from A/C systems. Just adding Freon is usually not the fix. Filter do get neglected as you said. You can usually guess if the person should not be doing the work, just by the way the ask for help, or describe the problem.

Guido.
 
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