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Electric engine cooling fan seems to run constantly-

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Sticking relay.Try pulling relay and look for corrosion then clean and put back.

Posted on May 17, 2011

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  • Master
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It is going to kick on within a few minutes of starting it up, almost always unless running at freeway speeds, and for a few minutes after turning it off. if it is running more than that you have a problem in the temp sensor, the relay, or the car's electronic controller.

Posted on May 17, 2011

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I have a 96 Buick skylark.its overheating and I just replaced the thermostat and hose that runs from the radiator to the engine. But its still over heating.what can it be?


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Why the cooling fan on my car will not stop running?


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I am thinking either the engine block sensor or possibly a relay in the electrical box under the hood has failed, and is sending electricity to the fan when it shouldn't.
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I have a 2002 buick century. It seems to be running hot. I have flushed the coolant system and refilled the radiator. I have replaced the temp sensor and the molule in the fuse box, still the electric...


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My car runs fine everythiing seems good, just had a new radiator put on it, but when my car sits running for awhile it starts to overheat, then i start to drive and it cools back down?. please help


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Car is overheating ...already replaced waterpump, flushed radiator, changed thermastat and replaced new water cap. there is no leak, and it over heats sometimes not everytime?


Hi!!
Make sure the small hose going from the reservoir to the radiator and the orifice at the reservoir are not clogged. If OK, check electric cooling fan system, specifically the Coolant Temp. sensor, Fan Relays and Constant Control Relay Module (CCRM).
Electric cooling fan system consists of a fan and electric motor attached to the fan shroud.
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  • Fan is controlled by Constant Control Relay Module (CCRM) with inputs from Powertrain Control Module (PCM).
The electric cooling fan is wired to operate only when ignition switch is in ON position and engine temperature exceeds specified temperature, or when A/C is on and vehicle speed is less than 45 MPH. During hard acceleration, the Wide Open Throttle A/C Cut-Off (WAC) relay controls the A/C clutch and cooling fan. A signal is sent to PCM and then to the CCRM, where the module de-energizes the A/C clutch and cooling fan, decreasing engine load during acceleration.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

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