radiator fan problem

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wyobob

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Jun 7, 2023
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Wyoming
My 2010 wrangler JKU gets hot sometimes as the radiator fan does not come on. You can turn the ignition off and back on and the fan comes on. I have been looking for loose or broken wires and can't find anything. Any suggestions?
 
wyobob said:
My 2010 wrangler JKU gets hot sometimes as the radiator fan does not come on. You can turn the ignition off and back on and the fan comes on. I have been looking for loose or broken wires and can't find anything. Any suggestions?
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I'm pretty sure there's a relay for it and also the temp sender tells it when to come on. Bad grounds can cause electrical problems.
 
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BLACKJKU said:
I'm pretty sure there's a relay for it and also the temp sender tells it when to come on. Bad grounds can cause electrical problems.
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If you are able to reset with the ignition I would go @BLACKJKU 's route. Check the electrical, small steps. Check conductivity, swap relays, run direct power. If the fan never triggers due to heat (but does run) I would suspect a bad temp sensor.
 
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