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John Deere 9870 won't run A/C and Autosteer at the same time.
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taylorbros
Posted 11/30/2025 15:38 (#11452362)
Subject: John Deere 9870 won't run A/C and Autosteer at the same time.


NE MO
We have went over and over this problem so I am turning to the experts. Our 2010 9870 works great until we try to operate the autosteer (JD Brown box). The A/C and blower shuts off and will not work again until you shut the engine off and restart it. Autosteer will operate as it should while the A/C is inoperative.

Theories that have been offered:

1. Not enough power in cab to run both. I would think that we would have fuse issues if that was the case.

2. Bad ground. Cleaned cab grounds and ran an additional ground wire with no improvement

3. Needs a dealer software update. Anything is possible I guess.

Was just curious if anyone has encountered a similar issue and had a foolproof solution.

Thanks!
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