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2003 Focus : low speed cooling fans w will not turn on until temp hits red mark. When AC is on, fans run fine. Has anyone else had this problem and can they offer an answer as to the cause of the problem? Car has been at dealer for 3 days, and no luck diagnosing problem yet.Help me before I either go broke or blow up engine. Thanks. Bill
 

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Well I don't think the fan is supposed to come on until you stop. Normally when your driving the air flow freely through the motor. Your thermostat may be stuck and that is why your goin up into the red. Post your results.
 

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'Well I don't think the fan is supposed to come on until you stop"

Not true. It is temperaure controlled. As you might imagine, if you are going 5 mph in rush hour traffic, the radiator can use a little help, even though you are moving!
 
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