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ive been fighting an overheating problem on a 05 magnum 2.7L v6. I believe my fan relays are working properly...................fans would not come on except when a/c was running, even when the car was overheating. I tested the relays and they seemed fine. so I replaced the coolant temperature sensor thinking it wasn't sending a signal to the fans. now the fans come on right away but the temp gauge doesn't read correctly now. any ideas? maybcooe this new temp sensor is defective?
 

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Check engine light on? If so, you can have autozone check the code, might just be a stuck thermostat. $15-$20
 

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Try replacing the sensor and see if that helps.
 

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I had this issue before and it turned out to be the harness on the fans not being all the way connected. They would come on sometimes but the car would overheat like crazy. Its a shot in the dark but check the harness.
 
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