how to fix my cooling fan on my 2001 chevy ventur on 2001 Chevrolet Venture

my fan goes slow I have checked the relays and they are good and new. the van gets hot three line from very hot. what could it be

Asked by for the 2001 Chevrolet Venture
A professional scanner can override the cooling fan system to check for 'high speed' operation! The coolant temp. SENSOR tells the computer which fan speed is needed! Have it scanned and functional test performed by a mechanic!
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1 more answer , 1 more comment
Check the voltage and ground to the fans, or use a test probe and jump directly to them to check the function, they might be tired and ready to be replaced.
where would the cooling temp sensor be. Would it be by the thermostat