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John Deere 8400 air conditioning
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Fencepost
Posted 6/25/2015 17:12 (#4645736)
Subject: John Deere 8400 air conditioning


I've got no power to the compressor I checked the fuse and the relay switched with another relay still no power to the compressor I can force the compressor on with a battery charger then the system cools fine what am I missing.
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TJG in MS
Posted 6/25/2015 17:45 (#4645778 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


Itta Bena Mississippi		When your pressurizer fan quits it cuts the circuit to the compressor. It's the fan under the floor board. IIRC, you can put a dummy plug in it to get running and replace the fan later.
Tom
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johnypop
Posted 6/25/2015 17:46 (#4645781 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


ND		I assume you have enough freon so check if you have power on the psi switches at rear of cab.
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JDGnut
Posted 6/25/2015 18:35 (#4645838 - in reply to #4645781)
Subject: RE: John Deere 8400 air conditioning


Waxahachie, TX		There is a diode in that system that will short out, but it normally takes the fuse out..
On the left side of the evaporator are the pressure switches.. (Could be one dual switch or two.) try jumping the switch and see.. There is also a evaporate core temp switch..(de-icing switch)..
If you pull the interior panel behind the seat you can see them.. Not the easiest to get too.. Some you had to go through an access plate under the rear cover..
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kversh
Posted 6/25/2015 20:23 (#4646023 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


Check the fuse for the pressurizer motor. If it is blown it cuts power to the relay for the a/c. Don't ask me how I know
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KelB
Posted 6/25/2015 20:50 (#4646087 - in reply to #4646023)
Subject: RE: John Deere 8400 air conditioning



Ayr Queensland Australia 4807
kversh - 6/26/2015 11:23

Check the fuse for the pressurizer motor. If it is blown it cuts power to the relay for the a/c. Don't ask me how I know



Pull the floor mat out and unplug the the motor to test
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Jd7730
Posted 6/25/2015 21:57 (#4646272 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


SE MN		Mine did that once and it was a bad wire connection on the on/off (snowflake) switch on the console. Didn't even have to buy a part for that one!
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Wheat77
Posted 6/25/2015 22:00 (#4646281 - in reply to #4646272)
Subject: RE: John Deere 8400 air conditioning


It is hard to get a solution to a problem, and you have had some leads. Let us know
if you get it fixed.
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83les
Posted 5/19/2020 23:28 (#8268601 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


so this happened today to our 8400 no power to the back of the panel switch, ended up putting a fused jumper wire in from the power strip till we got time to look closer. fuse in the fuse box wasnt blown. was wondering if found out what found?
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jiffy
Posted 3/30/2022 16:12 (#9588136 - in reply to #4645736)
Subject: RE: John Deere 8400 air conditioning


*
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