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Radiator fan turning on and off????

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Old 12-03-2012, 12:41 PM
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Default Radiator fan turning on and off????

My left fan is constantly starting up and shutting off non stop, my temp holds staedy around 208 so I don't think it's a big deal but I want to get it fixed
Old 12-03-2012, 12:52 PM
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Just throwing this out there. Not sure now which fan it was but if your AC system is low and your running the defrost or the AC the fan will kick on and off with the compressor. That's what mine did. I filled the system and it stopped.
Old 12-03-2012, 12:53 PM
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Also will cycle when heat or defrost is on .
Old 12-03-2012, 12:54 PM
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Originally Posted by CRF99XJ
Just throwing this out there. Not sure now which fan it was but it your AC system is low and your running the defrost or the AC the fan will kick on and off with the compressor. That's what mine did. I filled the system and it stopped.
Could be, if this is the case and I turn off my defroster will it stop??? (Just thinkin how to trouble shoot that)
Old 12-03-2012, 01:01 PM
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Just turn the AC completely off. If it's still doing it then you have a different issue.
Old 12-03-2012, 01:18 PM
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Thanks guys I'll have to try it and see
Old 12-03-2012, 02:12 PM
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Originally Posted by jeeper jason
Could be, if this is the case and I turn off my defroster will it stop??? (Just thinkin how to trouble shoot that)
Should if not as stated above other issues
Old 12-03-2012, 02:21 PM
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Sorry to thread jack, but is there a way to keep the AC from kicking on when the defroster is on? Kind of annoying on those cold mornings when I'm trying to defrost the windshield and let the Jeep warm up...
Old 12-03-2012, 02:24 PM
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Originally Posted by sthon
Sorry to thread jack, but is there a way to keep the AC from kicking on when the defroster is on? Kind of annoying on those cold mornings when I'm trying to defrost the windshield and let the Jeep warm up...
Ac is gotta do it to remove moisture from the system has no affect on defrost temps...https://encrypted.google.com/#hl=en&...w=1182&bih=801

Last edited by freegdr; 12-03-2012 at 02:27 PM.
Old 12-03-2012, 02:33 PM
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Originally Posted by freegdr
Ac is gotta do it to remove moisture from the system has no affect on defrost temps...https://encrypted.google.com/#hl=en&...w=1182&bih=801
I understand the point of it running, to remove moisture from the air. It's usually pretty dry here in the winter, with the exception of the rain the last few days. In my case it's unnecessary 90% of the time for the AC to run in order to defrost the windows.
Old 12-03-2012, 03:13 PM
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Unplug the fan while running the defrost.
Old 12-03-2012, 03:13 PM
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Originally Posted by sthon
Sorry to thread jack, but is there a way to keep the AC from kicking on when the defroster is on? Kind of annoying on those cold mornings when I'm trying to defrost the windshield and let the Jeep warm up...
Don't worry about it man and it did turn off with the defroster, thanks for the help guys
Old 12-03-2012, 03:19 PM
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Originally Posted by jeeper jason
Don't worry about it man and it did turn off with the defroster, thanks for the help guys
Cool, add freon and it won't cycle near as often.
Old 12-03-2012, 03:23 PM
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Originally Posted by lowrange2
Unplug the fan while running the defrost.
Yeah. That might be the best solution during the winter. I was running hot last summer during the 100+* days and upgraded my radiator, water pump, and replaced everything else, including the engine. I'm finding it's taking a long time to get to operating temps in the mornings even with a dealer thermostat, and the aux fan kicking on doesn't help. My temps are steady at 200 - 210* once it warms up, I guess I could even run a 60/40 mix of antifreeze/water to increase temps a bit.
Old 12-03-2012, 05:27 PM
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Compressor is engaged in any of the 5 vent selector positions circled in yellow. The 2 white vent selector positions not circled, the compressor does not engage.
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