I Get A Vibration When I Put The Blower On Defrost - JeepForum.com

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post #1 of 5 Old 02-17-2017, 12:13 PM Thread Starter
blueseasons
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I Get A Vibration When I Put The Blower On Defrost

It doesn't start immediately. It kicks in after a few seconds on defrost. Goes away when I switch to another mode and it goes away when I drive. It seems to be happening when I am sitting still or in Park.I did not see a drop in RPM's on the Tach and the Tach needle doesn't vibrate. The A/C doesn't work, not charged, but this vibration isn't affected by pushing the A/C button. It does not go away when I rev the engine. I can feel it in the steering wheel and in the seat. I can hear it to. Sounds like a low level hum. I am not sure its coming from the engine. If anybody has some things I should check out. Let me know.

Thanks

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post #2 of 5 Old 02-17-2017, 07:59 PM
Tumbleweed1954
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The A/C compressor is supposed to run in defrost. The switch will not turn it off and on.
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post #3 of 5 Old 02-18-2017, 05:15 AM
HarryH3
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Since the a/c doesn't work anyway, just unplug the connector at the a/c compressor clutch and see if the problem goes away.
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post #4 of 5 Old 02-18-2017, 08:42 AM Thread Starter
blueseasons
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Thew vibration is when the e-fan turns on. Didn't always do that. Thanks.
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post #5 of 5 Old 02-20-2017, 01:09 PM Thread Starter
blueseasons
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HarryH3: Instead of messing with the clip to the A/C compressor, I unplugged the dryer. That should disable the compressor. Still happened so it's not likely the A/C compressor. It is connected to the E-Fan. If I am parked and the temp creeps up a bit to signal the E-Fan to turn on. The vibration starts. As soon as I drive it and the temp goes down, it stops.. I don't see the temp increase on the gauge though.
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