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Unread 04-03-2015, 01:13 PM   #1
cherrybomb05
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2010 JK Wrangler 
 
Join Date: Nov 2010
Location: , United States
Posts: 2,091
Hey guys, need your advice once again. A few months ago I was goofing around and I ended up stuck in the snow. Long story short I ended up frying a fan circuit. I had it replaced and ever since then the radiator fan comes on after about 15 minutes of driving, will run for a little bit and then shut off. 10 minutes later it will do the same thing. Temperature doesn't matter. I replaced the thermostat and that didn't do it. I'm at a loss here!!

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Unread 04-03-2015, 04:32 PM   #2
ronjenx
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2008 JK Wrangler 
 
Join Date: Jan 2009
Location: Maine
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The first thing to consider, is what is the actual temp of the engine when the fan comes on. You can check that with an infrared temp gun. Point it at the area around the base of the thermostat housing. That is where the temp sensor is, too. Do that after a cold start, and while it's idling, keep an eye on the infrared gun, pointing and checking it every 30 seconds or so. If the fan comes on before the temp reaches about 215F, the temp sensor may be sending a wrong signal. The fan should stop when it cools the engine down to about 195F.
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Unread 04-03-2015, 08:42 PM   #3
cherrybomb05
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Location: , United States
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Never thought of the sensor. I'll have to try that. I'm sure someone in the Jeep Club has a infared gun. Thanks.
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