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Why do the electric cooling fans come on as soon as I start up my 2001 Buick Lesabre?

The engine temp will not come up and this causes a P128 code to turn the check engine light on. I have replaced the thermostat and the coolant temp sensor but the temperature still stays low. The only thing I see wrong is the cooling fans coming on at start up causing the temp to stay low.

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Even with the fans on the temp will go up to the thermostat temperature of about 180 degrees.
The temp should go up to normal even with the fans running.
Like if you were on the highway, even more air would go over the radiator.
What's up with that thermostat? Somethings wrong. Is it the right temp?

My car will start the fans up, if I idle it for 5 or 6 minutes before driving away.
The A/C system turns on the fans as well . Are you sure it's not on, or in Defrost.
Defrost runs the A/C in many cars.
The cooling fan relay could be stuck?

The previous owner rigged the fans to run all the time?
If he did...
He knew something you don't know, about the car and its issues.
Like if it gets hot the overdrive solenoid gets stuck.
What color is the tranny fluid? Brown means its been overheated.

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This is just a try it answer.My Buick Century passenger side has a fuse box built in it.Low tire light would not go off even after new tires put on the man had to reset fuse box to get it to go off.So try resetting fuse?

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There is a switch in the radiator that provides ground for the electrical fans. If it fails that will either turn the fans constantly or not at all. Even with the fans running the coolant thermostat should keep the coolant at the correct temp.

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