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Combines & Harvesters Discussion Forum

JD 4400 air conditioning not working after conversion

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steveinohio

10-25-2012 06:30:16
75.60.187.30



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I had my air conditioning compressor and dryer switched to R134A the first week in September and it had cold air as expected. When I tried using a couple of days ago no cold air was felt. I can see the compressor is not turning when the switch is turned on to "cold" and making sure the heater switch is off. I checked the fuse and it's okay. Where do I want to start next? A new cab switch? Could it be the connection at the compressor? Any assistance is greatly appreciated.

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tjiniowa

10-27-2012 05:41:47
63.152.60.77



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 Re: JD 4400 air conditioning not working after conversion in reply to steveinohio, 10-25-2012 06:30:16  
If it is not low on freon, then jumper wire the compressor and see if the clutch is ok before you get into it much further



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Karl in MD

10-26-2012 08:26:34
167.102.133.216



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 Re: JD 4400 air conditioning not working after conversion in reply to steveinohio, 10-25-2012 06:30:16  
If it has Gates hoses, there is a chance that the mold release agent in the hoses reacted with the oil in the r-134, and left a coating on the inside of the evaporator, insulating it and preventing heat transfer. This happened a bunch of times when I worked for Deere in the 90"s when a lot of systems were changed over. We had to flush the systems and recharge them.



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tomNE

10-25-2012 20:07:19
75.234.172.181



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 Re: JD 4400 air conditioning not working after conversion in reply to steveinohio, 10-25-2012 06:30:16  
there is sometimes a problem with the new low pressure valves. they sometimes don't seal up properly.



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john deere haverstor guy

10-25-2012 06:36:08
66.82.20.123



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 Re: JD 4400 air conditioning not working after conversion in reply to steveinohio, 10-25-2012 06:30:16  
Check and make sure your freon didnt leak out. Thats usely the culprit when a compresser wont kick in. You might have a leak somewhere.



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steveinohio

10-25-2012 14:19:10
75.60.201.11



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 Re: JD 4400 air conditioning not working after conversion in reply to john deere haverstor guy, 10-25-2012 06:36:08  
I"ll check on the freon in the system; I"d be surprised if it leaked out as I never had a problem with leaks before but there is always a first time. Also, there is a thermal switch and an air conditioning temperature control switch. Could one of these be malfunctioning and needed replaced?



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