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Hi,

There are a few possibilities, and you will have to do some testing.

First, test the fuses (under the hood) that supply power to the relays that control the fans. Next make sure that the engine is getting warm enough to actually turn the fans on. Then, also see that the wiring is all connected so that the fans get voltage at the appropriate time. Lastly, it could be the fans themselves, but if both are not working, then it is probably something else.

I have provided a link that shows how the system works, which might be helpful.

Good Luck

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Q: Why your radiator cooling fan for a 2002 Chevy venture doesn't work?
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