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Hello, looking to revive this post if possible - as I am having a very similar set of circumstances. I have a 2006 Chevy Malibu LTZ v6 3.5L. My radiator cooling fans will not automatically kick on.

The fans do work& there is circuit continuity, as they will both kick on if the a/c is turned on. All relays & fuses have been checked for continuity & working condition. The thermostat & coolant temperature sensor have been replaced. The coolant system has been flushed& bled repeatedly. The coolant pump has been stethoscoped for good measure.

Bottom line is: the radiator fans are not kicking on, even when the temperature meets or exceeds operating temperature/mid-line on the temperature gauge. I've had it to a mechanic twice who claims there are no codes& has costed me hundreds to no avail.

Any help would be profoundly appreciated!
 
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