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Assuming you have electric fans, and the engine isn't hot enough for them to engage at the point when they're supposed to, the problem most likely lies in your thermal sensor.

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Q: What causes coolant fans to kick off and on when the key is turned over but the car isn't running?
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Why are the fans running on a Oldsmobile alero 2000 when the car is on?

to cool the coolant in the engine

Where is the coolant sensor located for the radiator fans on a 1998 Rav4?

the fans are operated by means of a series of relays which are turned on or off by the engine computer. the engine coolant temp sensor that sends its signal to the engine computer is what indirectly turns on the fans. if there is no check engine light for a coolant temp. sensor code, the problem lies in the fans themselves, or the relays and related wiring.

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your themostat does not control your fans your fans are controled by coolant temp sensor if they are running all the time the problem is in the coolant temp it not working and ecm is overriding it and alowing the fans to run all the time.

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What does it mean when car runs hot in traffic and normal when speed is up?

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Does the coolant level sensor turn the fans on?

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How do you stop a 2004 element from running hot even after changing the coolant?

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Where can one find information on Coolant fans?

One can find information on Coolant fans many places. You can find information on Coolant fans from advertisements, such as commercial's. You can also find information online including there primary site.